{"id":6566,"date":"2019-09-28T08:11:50","date_gmt":"2019-09-28T00:11:50","guid":{"rendered":"http:\/\/www.hefeiyu.com\/?p=6566"},"modified":"2019-09-27T08:12:51","modified_gmt":"2019-09-27T00:12:51","slug":"plsql%e7%a8%8b%e5%ba%8f%e4%bc%98%e5%8c%96%e5%92%8c%e6%80%a7%e8%83%bd%e5%88%86%e6%9e%90%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.hefeiyu.com\/?p=6566","title":{"rendered":"PLSQL\u7a0b\u5e8f\u4f18\u5316\u548c\u6027\u80fd\u5206\u6790\u65b9\u6cd5"},"content":{"rendered":"<p>&nbsp;<\/p>\n<h1><a id=\"post-6566-_Toc205891193\"><\/a>\u524d\u8a00<\/h1>\n<h2><a id=\"post-6566-_Toc72738885\"><\/a><a id=\"post-6566-_Toc104084085\"><\/a><a id=\"post-6566-_Toc104452343\"><\/a><a id=\"post-6566-_Toc205891194\"><\/a>\u76ee\u7684<\/h2>\n<p>\u6027\u80fd\u6d4b\u8bd5\u662f\u6d4b\u8bd5\u4e2d\u6bd4\u8f83\u91cd\u8981\u7684\u5de5\u4f5c\uff0c\u6027\u80fd\u6d4b\u8bd5\u5e94\u5206\u4e3a\u538b\u529b\u7684\u6d4b\u8bd5\u548c\u6027\u80fd\u7684\u6d4b\u8bd5\uff0c\u5176\u4e2d\u6027\u80fd\u95ee\u9898\u4e2d\u7edd\u5927\u90e8\u5206\u90fd\u662f\u7531\u4e8e\u7a0b\u5e8f\u7f16\u5199\u7684\u4e0d\u5408\u7406\u3001\u4e0d\u89c4\u8303\u9020\u6210\u7684\u3002\u672c\u6587\u6863\u8bf4\u660e\u4e86\u7a0b\u5e8f\u4e2d\u5e38\u89c1\u7684\u4e0d\u4f18\u5316\u7684\u811a\u672c\u7f16\u5199\uff0c\u5bfc\u81f4\u7684\u6027\u80fd\u95ee\u9898\uff0c\u5e76\u4e14\u5728\u4e5f\u63cf\u8ff0\u4e86\u600e\u6837\u53bb\u8ddf\u8e2a\u548c\u89e3\u51b3\u7a0b\u5e8f\u4e0a\u7684\u6027\u80fd\u95ee\u9898\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u5728\u6700\u540e\u4e00\u7ae0\u91cc\u9762\u63cf\u8ff0\u4e86\u505a\u4e00\u4e2a\u767d\u76d2\u6d4b\u8bd5\u5de5\u5177\u6d4b\u8bd5\u6027\u80fd\u95ee\u9898\u7684\u8bbe\u8ba1\u601d\u60f3\u3002<\/p>\n<h2><a id=\"post-6566-_Toc205891195\"><\/a>\u6587\u6863\u8bf4\u660e<\/h2>\n<p>\u672c\u6587\u6863\u53ea\u8bf4\u660ePLSQL\u7f16\u5199\u7684\u4f18\u5316\u95ee\u9898\uff0c\u4e0d\u5305\u62ecORACLE\u672c\u8eab\u7684\u6027\u80fd\u4f18\u5316\uff08\u5185\u5b58SGA\u3001\u7cfb\u7edf\u53c2\u6570\u3001\u8868\u7a7a\u95f4\u7b49\uff09\u3001\u64cd\u4f5c\u7cfb\u7edf\u7684\u6027\u80fd\u95ee\u9898\u548c\u786c\u4ef6\u7684\u6027\u80fd\u95ee\u9898\u3002\u5bf9\u4e8ePLSQL\u7a0b\u5e8f\u4f18\u5316\u65b9\u9762\u7684\u5185\u5bb9\u6709\u5f88\u591a\uff0c\u672c\u6587\u6863\u5217\u51fa\u5728\u6211\u4eec\u5b9e\u9645\u5de5\u4f5c\u4e2d\u4e00\u4e9b\u5e38\u89c1\u7684\u60c5\u51b5\u3002\u672c\u6587\u6863\u96be\u514d\u6709\u4e0d\u6b63\u786e\u7684\u5730\u65b9\uff0c\u4e5f\u9700\u8981\u5927\u5bb6\u7ed9\u4e88\u6307\u6b63\u3002<\/p>\n<p>\u672c\u6587\u6863\u4e3e\u4f8b\u8bf4\u660e\u7684\u95ee\u9898\u8bed\u53e5\u4e0d\u662f\u5b9e\u9645\u7a0b\u5e8f\u4e2d\u771f\u6b63\u5b58\u5728\u7684\uff0c\u53ea\u662f\u8ba9\u5927\u5bb6\u80fd\u770b\u8d77\u6765\u66f4\u5bb9\u6613\u7406\u89e3\uff0c\u4f46\u8fd9\u4e9b\u8bed\u53e5\u4e5f\u4e0d\u4ee3\u8868\u5728\u6211\u4eec\u7a0b\u5e8f\u4e2d\u5176\u4ed6\u90e8\u5206\u8bed\u53e5\u4e0d\u5b58\u5728\u8fd9\u4e9b\u95ee\u9898\u3002<\/p>\n<p>\u4e3e\u4f8b\u8bf4\u660e\u4e2d\u7684\u8bed\u53e5\u91c7\u7528\u7684\u662f\u793e\u4fdd\u6838\u5fc3\u5e73\u53f0\u7684\u6570\u636e\u5b57\u5178\uff0c\u5728\u4e3e\u4f8b\u63cf\u8ff0\u4e2d\u6ca1\u6709\u6807\u660e\u8868\u540d\u548c\u5b57\u6bb5\u540d\u7684\u542b\u4e49\uff0c\u8fd8\u9700\u5355\u72ec\u53c2\u8003\u3002<\/p>\n<h1><a id=\"post-6566-_Toc205891198\"><\/a>PLSQL\u7a0b\u5e8f\u4f18\u5316\u539f\u5219<\/h1>\n<h2><a id=\"post-6566-_Toc97052285\"><\/a><a id=\"post-6566-_Toc205891199\"><\/a>\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u7684\u5185\u5728\u539f\u56e0<\/h2>\n<p>\u5bfc\u81f4\u7cfb\u7edf\u6027\u80fd\u51fa\u73b0\u95ee\u9898\u4ece\u7cfb\u7edf\u5e95\u5c42\u5206\u6790\u4e5f\u5c31\u662f\u5982\u4e0b\u51e0\u4e2a\u539f\u56e0\uff1a<\/p>\n<ul>\n<li>CPU\u5360\u7528\u7387\u8fc7\u9ad8\uff0c\u8d44\u6e90\u4e89\u7528\u5bfc\u81f4\u7b49\u5f85<\/li>\n<li>\u5185\u5b58\u4f7f\u7528\u7387\u8fc7\u9ad8\uff0c\u5185\u5b58\u4e0d\u8db3\u9700\u8981\u78c1\u76d8\u865a\u62df\u5185\u5b58<\/li>\n<li>IO\u5360\u7528\u7387\u8fc7\u9ad8\uff0c\u78c1\u76d8\u8bbf\u95ee\u9700\u8981\u7b49\u5f85<\/li>\n<\/ul>\n<h2><a id=\"post-6566-_Toc205891200\"><\/a>PLSQL\u4f18\u5316\u7684\u6838\u5fc3\u601d\u60f3<\/h2>\n<p>PLSQL\u4f18\u5316\u5b9e\u9645\u4e0a\u5c31\u662f\u907f\u514d\u51fa\u73b0\u201c\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u7684\u5185\u5728\u539f\u56e0\u201d\uff0c\u5b9e\u9645\u4e0a\u7f16\u5199\u7a0b\u5e8f\uff0c\u4ee5\u53ca\u6027\u80fd\u95ee\u9898\u8ddf\u8e2a\u5e94\u8be5\u672c\u7740\u8fd9\u4e2a\u6838\u5fc3\u601d\u60f3\u53bb\u8003\u8651\u548c\u89e3\u51b3\u95ee\u9898\u3002<\/p>\n<ul>\n<li>PLSQL\u7a0b\u5e8f\u5360\u7528CPU\u7684\u60c5\u51b5\n<ul>\n<li>\u7cfb\u7edf\u89e3\u6790SQL\u8bed\u53e5\u6267\u884c\uff0c\u4f1a\u6d88\u8017CPU\u7684\u4f7f\u7528<\/li>\n<li>\u8fd0\u7b97\uff08\u8ba1\u7b97\uff09\u4f1a\u6d88\u8017CPU\u7684\u4f7f\u7528<\/li>\n<\/ul>\n<\/li>\n<li>PLSQL\u7a0b\u5e8f\u5360\u7528\u5185\u5b58\u7684\u60c5\u51b5\n<ul>\n<li>\u8bfb\u5199\u6570\u636e\u90fd\u9700\u8981\u8bbf\u95ee\u5185\u5b58<\/li>\n<li>\u5185\u5b58\u4e0d\u8db3\u65f6\uff0c\u4e5f\u4f1a\u4f7f\u7528\u78c1\u76d8<\/li>\n<\/ul>\n<\/li>\n<li>PLSQL\u7a0b\u5e8f\u589e\u5927IO\u7684\u60c5\u51b5\n<ul>\n<li>\u8bfb\u5199\u6570\u636e\u90fd\u9700\u8981\u8bbf\u95ee\u78c1\u76d8IO<\/li>\n<li>\u8bfb\u53d6\u7684\u6570\u636e\u8d8a\u591a\uff0cIO\u5c31\u8d8a\u5927<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u5927\u5bb6\u90fd\u77e5\u9053CPU\u73b0\u5728\u90fd\u5f88\u9ad8\uff0c\u8ba1\u7b97\u901f\u5ea6\u975e\u5e38\u5feb\uff1b\u8bbf\u95ee\u5185\u5b58\u7684\u901f\u5ea6\u4e5f\u5f88\u5feb\uff1b\u4f46\u78c1\u76d8\u7684\u8bbf\u95ee\u76f8\u5bf9\u524d\u4e24\u4e2a\u76f8\u6bd4\u901f\u5ea6\u5c31\u5dee\u7684\u975e\u5e38\u5927\u4e86\uff0c\u56e0\u6b64PLSQL\u6027\u80fd\u4f18\u5316\u7684\u91cd\u70b9\u4e5f\u5c31\u662f\u51cf\u5c11IO\u7684\u74f6\u9888\uff0c\u6362\u53e5\u8bdd\u8bf4\u5c31\u662f\u5c3d\u91cf\u51cf\u5c11IO\u7684\u8bbf\u95ee\u3002<\/p>\n<p>\u6027\u80fd\u7684\u4f18\u5148\u7ea7CPU-&gt;\u5185\u5b58-&gt;IO\uff0c\u5f71\u54cd\u6027\u80fd\u7684\u56e0\u7d20\u4f9d\u6b21\u9012\u589e\u3002\u6839\u636e\u4e0a\u9762\u7684\u5206\u6790\uff0cPLSQL\u4f18\u5316\u7684\u6838\u5fc3\u601d\u60f3\u4e3a\uff1a<\/p>\n<ol>\n<li><strong>\u907f\u514d\u8fc7\u591a\u590d\u6742\u7684SQL\u811a\u672c\uff0c\u51cf\u5c11\u7cfb\u7edf\u7684\u89e3\u6790\u8fc7\u7a0b<\/strong><\/li>\n<li><strong>\u907f\u514d\u8fc7\u591a\u7684\u65e0\u7528\u7684\u8ba1\u7b97\uff0c\u4f8b\u5982\uff1a\u6b7b\u5faa\u73af<\/strong><\/li>\n<li><strong>\u907f\u514d\u6d6a\u8d39\u5185\u5b58\u7a7a\u95f4\u6ca1\u6709\u5fc5\u8981\u7684SQL\u811a\u672c\uff0c\u5bfc\u81f4\u5185\u5b58\u4e0d\u8db3<\/strong><\/li>\n<li><strong>\u5185\u5b58\u4e2d\u8ba1\u7b97\u548c\u8bbf\u95ee\u901f\u5ea6\u5f88\u5feb<\/strong><\/li>\n<li><strong>\u5c3d\u53ef\u80fd\u7684\u51cf\u5c11\u78c1\u76d8\u7684\u8bbf\u95ee\u7684\u6570\u636e\u91cf\uff0c\u8be5\u539f\u5219\u662fPLSQL\u4f18\u5316\u4e2d\u91cd\u8981\u601d\u60f3\u3002<\/strong><\/li>\n<li><strong>\u5c3d\u53ef\u80fd\u7684\u51cf\u5c11\u78c1\u76d8\u7684\u8bbf\u95ee\u7684\u6b21\u6570\uff0c\u8be5\u539f\u5219\u662fPLSQL\u4f18\u5316\u4e2d\u91cd\u8981\u601d\u60f3\u3002<\/strong><\/li>\n<\/ol>\n<p>\u4e0b\u9762\u7684\u7ae0\u8282\u5177\u4f53\u4ecb\u7ecd\u5e38\u89c1\u5f71\u54cd\u6027\u80fd\u7684SQL\u8bed\u53e5\u60c5\u51b5\u3002<\/p>\n<h2><a id=\"post-6566-_Toc205891201\"><\/a>ORACLE\u4f18\u5316\u5668<\/h2>\n<p>ORACLE\u7684\u4f18\u5316\u5668\uff1a<br \/>\na. RULE (\u57fa\u4e8e\u89c4\u5219) b. COST (\u57fa\u4e8e\u6210\u672c) c. CHOOSE (\u9009\u62e9\u6027)<\/p>\n<p>\u8bbe\u7f6e\u7f3a\u7701\u7684\u4f18\u5316\u5668,\u53ef\u4ee5\u901a\u8fc7\u5bf9init.ora\u6587\u4ef6\u4e2dOPTIMIZER_MODE\u53c2\u6570\u7684\u5404\u79cd\u58f0\u660e,\u5982RULE,COST,CHOOSE,ALL_ROWS,FIRST_ROWS . \u4f60\u5f53\u7136\u4e5f\u5728SQL\u53e5\u7ea7\u6216\u662f\u4f1a\u8bdd(session)\u7ea7\u5bf9\u5176\u8fdb\u884c\u8986\u76d6.<\/p>\n<p>\u4e3a\u4e86\u4f7f\u7528\u57fa\u4e8e\u6210\u672c\u7684\u4f18\u5316\u5668(CBO, Cost-Based Optimizer) , \u4f60\u5fc5\u987b\u7ecf\u5e38\u8fd0\u884canalyze \u547d\u4ee4,\u4ee5\u589e\u52a0\u6570\u636e\u5e93\u4e2d\u7684\u5bf9\u8c61\u7edf\u8ba1\u4fe1\u606f(object statistics)\u7684\u51c6\u786e\u6027.<\/p>\n<p>\u5982\u679c\u6570\u636e\u5e93\u7684\u4f18\u5316\u5668\u6a21\u5f0f\u8bbe\u7f6e\u4e3a\u9009\u62e9\u6027(CHOOSE),\u90a3\u4e48\u5b9e\u9645\u7684\u4f18\u5316\u5668\u6a21\u5f0f\u5c06\u548c\u662f\u5426\u8fd0\u884c\u8fc7analyze\u547d\u4ee4\u6709\u5173. \u5982\u679ctable\u5df2\u7ecf\u88abanalyze\u8fc7, \u4f18\u5316\u5668\u6a21\u5f0f\u5c06\u81ea\u52a8\u6210\u4e3aCBO , \u53cd\u4e4b,\u6570\u636e\u5e93\u5c06\u91c7\u7528RULE\u5f62\u5f0f\u7684\u4f18\u5316\u5668.<\/p>\n<p>\u5728\u7f3a\u7701\u60c5\u51b5\u4e0b,ORACLE\u91c7\u7528CHOOSE\u4f18\u5316\u5668, \u4e3a\u4e86\u907f\u514d\u90a3\u4e9b\u4e0d\u5fc5\u8981\u7684\u5168\u8868\u626b\u63cf(full table scan) , \u4f60\u5fc5\u987b\u5c3d\u91cf\u907f\u514d\u4f7f\u7528CHOOSE\u4f18\u5316\u5668,\u800c\u76f4\u63a5\u91c7\u7528\u57fa\u4e8e\u89c4\u5219\u6216\u8005\u57fa\u4e8e\u6210\u672c\u7684\u4f18\u5316\u5668.<\/p>\n<p>\u5728oracle10g\u524d\u9ed8\u8ba4\u7684\u4f18\u5316\u6a21\u5f0f\u662fCHOOSE\uff0c10g\u9ed8\u8ba4\u662fALL_ROWS\uff0c\u6211\u4e0d\u5efa\u8bae\u5927\u5bb6\u53bb\u6539\u52a8ORACLE\u7684\u9ed8\u8ba4\u4f18\u5316\u6a21\u5f0f\u3002<\/p>\n<h2><a id=\"post-6566-_Toc205891202\"><\/a>PLSQL\u4f18\u5316<\/h2>\n<p>\u4e3b\u8981\u8bf4\u660e\u4e86\u5728SQL\u7f16\u5199\u4e0a\u548cPLSQL\u7a0b\u5e8f\u7f16\u5199\u4e0a\u53ef\u4ee5\u4f18\u5316\u7684\u5730\u65b9\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891203\"><\/a>\u9009\u62e9\u6700\u6709\u6548\u7387\u7684\u8868\u540d\u987a\u5e8f<\/h3>\n<p>\u53ea\u5728\u57fa\u4e8e\u89c4\u5219\u7684\u4f18\u5316\u5668rule\u4e2d\u6709\u6548\uff0c\u76ee\u524d\u6211\u4eecoracle\u9009\u62e9\u7684\u4f18\u5316\u5668\u57fa\u672c\u90fd\u4e0d\u9009\u62e9rule\uff0c\u56e0\u6b64\u8be5\u95ee\u9898\u57fa\u672c\u4e0d\u4f1a\u51fa\u73b0\uff0c\u4f46\u4e3a\u4e86\u5b89\u5168\u548c\u89c4\u8303\u8d77\u89c1\uff0c\u5efa\u8bae\u7f16\u7a0b\u4e60\u60ef\u91c7\u7528\u8be5\u89c4\u5219\u3002<\/p>\n<p>ORACLE\u7684\u89e3\u6790\u5668\u6309\u7167\u4ece\u53f3\u5230\u5de6\u7684\u987a\u5e8f\u5904\u7406FROM\u5b50\u53e5\u4e2d\u7684\u8868\u540d,\u56e0\u6b64FROM\u5b50\u53e5\u4e2d\u5199\u5728\u6700\u540e\u7684\u8868(\u57fa\u7840\u8868 driving table)\u5c06\u88ab\u6700\u5148\u5904\u7406. \u5728FROM\u5b50\u53e5\u4e2d\u5305\u542b\u591a\u4e2a\u8868\u7684\u60c5\u51b5\u4e0b,\u4f60\u5fc5\u987b\u9009\u62e9\u8bb0\u5f55\u6761\u6570\u6700\u5c11\u7684\u8868\u4f5c\u4e3a\u57fa\u7840\u8868.\u5f53ORACLE\u5904\u7406\u591a\u4e2a\u8868\u65f6, \u4f1a\u8fd0\u7528\u6392\u5e8f\u53ca\u5408\u5e76\u7684\u65b9\u5f0f\u8fde\u63a5\u5b83\u4eec.\u9996\u5148,\u626b\u63cf\u7b2c\u4e00\u4e2a\u8868(FROM\u5b50\u53e5\u4e2d\u6700\u540e\u7684\u90a3\u4e2a\u8868)\u5e76\u5bf9\u8bb0\u5f55\u8fdb\u884c\u6d3e\u5e8f,\u7136\u540e\u626b\u63cf\u7b2c\u4e8c\u4e2a\u8868(FROM\u5b50\u53e5\u4e2d\u6700\u540e\u7b2c\u4e8c\u4e2a\u8868),\u6700\u540e\u5c06\u6240\u6709\u4ece\u7b2c\u4e8c\u4e2a\u8868\u4e2d\u68c0\u7d22\u51fa\u7684\u8bb0\u5f55\u4e0e\u7b2c\u4e00\u4e2a\u8868\u4e2d\u5408\u9002\u8bb0\u5f55\u8fdb\u884c\u5408\u5e76.<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>\u8868 ac01\u6709 16,384 \u6761\u8bb0\u5f55<br \/>\n\u8868 ab01 \u67091 \u6761\u8bb0\u5f55<\/p>\n<p>\u9009\u62e9ab01\u4f5c\u4e3a\u57fa\u7840\u8868 (\u597d\u7684\u65b9\u6cd5)<br \/>\nselect count(*) from ac01,ab01 \u6267\u884c\u65f6\u95f40.96\u79d2<\/p>\n<p>\u9009\u62e9ac01\u4f5c\u4e3a\u57fa\u7840\u8868 (\u4e0d\u597d\u7684\u65b9\u6cd5)<br \/>\nselect count(*) from ab01,ac01 \u6267\u884c\u65f6\u95f426.09\u79d2<\/p>\n<h3><a id=\"post-6566-_Toc205891204\"><\/a>WHERE\u5b50\u53e5\u4e2d\u7684\u8fde\u63a5\u987a\u5e8f<\/h3>\n<p>ORACLE\u91c7\u7528\u81ea\u4e0b\u800c\u4e0a\u7684\u987a\u5e8f\u89e3\u6790WHERE\u5b50\u53e5,\u6839\u636e\u8fd9\u4e2a\u539f\u7406,\u8868\u4e4b\u95f4\u7684\u8fde\u63a5\u5fc5\u987b\u5199\u5728\u5176\u4ed6WHERE\u6761\u4ef6\u4e4b\u524d<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>(\u4f4e\u6548)<br \/>\nSELECT ab01.aab001,ab02.aab051<br \/>\nFROM ab01,ab02<br \/>\nWHERE ab02.aae140=\u201931\u2019<br \/>\nAND ab01.aab001=ab02.aab001;<\/p>\n<p>(\u9ad8\u6548)<br \/>\nSELECT ab01.aab001,ab02.aab051<br \/>\nFROM ab01,ab02<br \/>\nWHERE ab01.aab001=ab02.aab001<br \/>\nAND ab02.aae140=\u201931\u2019;<\/p>\n<h3><a id=\"post-6566-_Toc205891205\"><\/a>SELECT\u5b50\u53e5\u4e2d\u907f\u514d\u4f7f\u7528 \u2018 * \u2018<\/h3>\n<p>\u5f53\u4f60\u60f3\u5728SELECT\u5b50\u53e5\u4e2d\u5217\u51fa\u6240\u6709\u7684COLUMN\u65f6,\u4f7f\u7528\u52a8\u6001SQL\u5217\u5f15\u7528 \u2018*&#8217; \u662f\u4e00\u4e2a\u65b9\u4fbf\u7684\u65b9\u6cd5.\u4e0d\u5e78\u7684\u662f,\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u4f4e\u6548\u7684\u65b9\u6cd5. \u5b9e\u9645\u4e0a,ORACLE\u5728\u89e3\u6790\u7684\u8fc7\u7a0b\u4e2d, \u4f1a\u5c06&#8217;*&#8217; \u4f9d\u6b21\u8f6c\u6362\u6210\u6240\u6709\u7684\u5217\u540d, \u8fd9\u4e2a\u5de5\u4f5c\u662f\u901a\u8fc7\u67e5\u8be2\u6570\u636e\u5b57\u5178\u5b8c\u6210\u7684, \u8fd9\u610f\u5473\u7740\u5c06\u8017\u8d39\u66f4\u591a\u7684\u65f6\u95f4\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891206\"><\/a>\u7528EXISTS\u66ff\u4ee3IN<\/h3>\n<p>\u5b9e\u9645\u60c5\u51b5\u770b\uff0c\u4f7f\u7528exists\u66ff\u6362in\u6548\u679c\u4e0d\u662f\u5f88\u660e\u663e\uff0c\u57fa\u672c\u4e00\u6837\u3002<\/p>\n<p>\u5728\u8bb8\u591a\u57fa\u4e8e\u57fa\u7840\u8868\u7684\u67e5\u8be2\u4e2d,\u4e3a\u4e86\u6ee1\u8db3\u4e00\u4e2a\u6761\u4ef6,\u5f80\u5f80\u9700\u8981\u5bf9\u53e6\u4e00\u4e2a\u8868\u8fdb\u884c\u8054\u63a5.\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b, \u4f7f\u7528EXISTS(\u6216NOT EXISTS)\u901a\u5e38\u5c06\u63d0\u9ad8\u67e5\u8be2\u7684\u6548\u7387.<\/p>\n<p>\u4f4e\u6548:<\/p>\n<p>SELECT *<br \/>\nFROM ac01<\/p>\n<p>Where aac001 in (select aac001 from ac02 where aab001=str_aab001 and aae140=\u201931\u2019);<\/p>\n<p>\u6216<\/p>\n<p>SELECT *<br \/>\nFROM ac01<\/p>\n<p>Where aac001 in (select distinct aac001 from ac02 where aab001=str_aab001 and aae140=\u201931\u2019);<\/p>\n<p>\u6ce8\u610f\u4f7f\u7528distinct\u4e5f\u4f1a\u5f71\u54cd\u901f\u5ea6<\/p>\n<p>\u9ad8\u6548:<\/p>\n<p>SELECT *<br \/>\nFROM ac01<\/p>\n<p>Where exists (select 1 from ac02 where aac001=ac01.aac001 and aab001=str_aab001 and aae140=\u201931\u2019);<\/p>\n<p>in\u7684\u5e38\u91cf\u5217\u8868\u662f\u4f18\u5316\u7684(\u4f8b\u5982\uff1aaab019 in (\u201820\u2019,\u201930\u2019))\uff0c\u4e0d\u7528exists\u66ff\u6362\uff1bin\u5217\u8868\u76f8\u5f53\u4e8eor<\/p>\n<p>&nbsp;<\/p>\n<h3><a id=\"post-6566-_Toc205891207\"><\/a>\u7528NOT EXISTS\u66ff\u4ee3NOT IN<\/h3>\n<p>Oracle\u572810g\u4e4b\u524d\u7248\u672cnot in\u90fd\u662f\u6700\u4f4e\u6548\u7684\u8bed\u53e5\uff0c\u867d\u7136\u572810g\u4e0anot in\u505a\u5230\u4e86\u4e00\u4e9b\u6539\u8fdb\uff0c\u4f46\u4ecd\u7136\u8fd8\u662f\u5b58\u5728\u4e00\u4e9b\u95ee\u9898\uff0c\u56e0\u6b64\u6211\u4eec\u4e00\u5b9a\u8981\u4f7f\u7528not exists\u6765\u66ff\u4ee3not in\u7684\u5199\u6cd5\u3002<\/p>\n<p>\u5728\u5b50\u67e5\u8be2\u4e2d,NOT IN\u5b50\u53e5\u5c06\u6267\u884c\u4e00\u4e2a\u5185\u90e8\u7684\u6392\u5e8f\u548c\u5408\u5e76. \u65e0\u8bba\u5728\u54ea\u79cd\u60c5\u51b5\u4e0b,NOT IN\u90fd\u662f\u6700\u4f4e\u6548\u7684 (\u56e0\u4e3a\u5b83\u5bf9\u5b50\u67e5\u8be2\u4e2d\u7684\u8868\u6267\u884c\u4e86\u4e00\u4e2a\u5168\u8868\u904d\u5386). \u4e3a\u4e86\u907f\u514d\u4f7f\u7528NOT IN ,\u6211\u4eec\u53ef\u4ee5\u628a\u5b83\u6539\u5199\u6210NOT EXISTS.<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>SELECT *<br \/>\nFROM ac01<br \/>\nWHERE aab001 NOT IN (SELECT aab001 from ab01 where aab020=\u2019100\u2019);<\/p>\n<p>\u4e3a\u4e86\u63d0\u9ad8\u6548\u7387.\u6539\u5199\u4e3a:<br \/>\nSELECT *<br \/>\nFROM ac01<br \/>\nWHERE not exists (SELECT 1 from ab01 where aab001=ac01.aab001 and aab020=\u2019100\u2019);<\/p>\n<h3><a id=\"post-6566-_Toc205891208\"><\/a>\u7528\u8868\u8fde\u63a5\u66ff\u6362EXISTS<\/h3>\n<p>\u5728\u5b50\u67e5\u8be2\u7684\u8868\u548c\u4e3b\u8868\u67e5\u8be2\u662f\u591a\u5bf9\u4e00\u7684\u60c5\u51b5\uff0c\u4e00\u822c\u91c7\u7528\u8868\u8fde\u63a5\u7684\u65b9\u5f0f\u6bd4EXISTS\u66f4\u6709\u6548\u7387\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<p>\u4f4e\u6548\uff1a<\/p>\n<p>SELECT ac01.*<br \/>\nFROM ac01<br \/>\nWhere exists (select 1 from ac02<br \/>\nwhere aac001=ac01.aac001<br \/>\nand aab001=ac01.aab001<br \/>\nand aae140=&#8217;31&#8217;<br \/>\nand aae041=&#8217;200801&#8242;);<\/p>\n<p>\u9ad8\u6548\uff1a<br \/>\nSELECT ac01.*<br \/>\nFROM ac02,ac01<br \/>\nWhere ac02.aac001=ac01.aac001<br \/>\nand ac02.aab001=ac01.aab001<br \/>\nand ac02.aae140=&#8217;31&#8217;<br \/>\nand aae041=&#8217;200801&#8242;;<\/p>\n<p>\u5230\u5e95exists\u548c\u8868\u5173\u8054\u54ea\u79cd\u6548\u7387\u9ad8\uff0c\u5176\u5b9e\u662f\u6839\u636e\u4e24\u4e2a\u8868\u4e4b\u95f4\u7684\u6570\u636e\u91cf\u5dee\u522b\u5927\u5c0f\u662f\u6709\u5173\u7684\uff0c\u5982\u679c\u5dee\u522b\u4e0d\u5927\u5b9e\u9645\u4e0a\u901f\u5ea6\u57fa\u672c\u5dee\u4e0d\u591a\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891209\"><\/a>\u7528EXISTS\u66ff\u6362DISTINCT<\/h3>\n<p>\u5f53\u63d0\u4ea4\u4e00\u4e2a\u5305\u542b\u4e00\u5bf9\u591a\u8868\u4fe1\u606f(\u6bd4\u5982\u4e2a\u4eba\u57fa\u672c\u4fe1\u606f\u8868\u548c\u4e2a\u4eba\u53c2\u4fdd\u4fe1\u606f\u8868)\u7684\u67e5\u8be2\u65f6,\u907f\u514d\u5728SELECT\u5b50\u53e5\u4e2d\u4f7f\u7528DISTINCT. \u4e00\u822c\u53ef\u4ee5\u8003\u8651\u7528EXISTS\u66ff\u6362<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>\u4f4e\u6548:<\/p>\n<p>select distinct ac01.aac001<br \/>\nfrom ac02,ac01<br \/>\nwhere ac02.aac001 = ac01.aac001<br \/>\nand ac02.aae140=&#8217;31&#8217;<br \/>\nand ac01.aab001=&#8217;100100&#8242;;<\/p>\n<p>\u9ad8\u6548:<\/p>\n<p>select ac01.aac001<br \/>\nfrom ac01<br \/>\nwhere exists(select 1 from ac02 where aac001 = ac01.aac001<br \/>\nand aae140=&#8217;31&#8217;)<br \/>\nand ac01.aab001=&#8217;100100&#8242;;<\/p>\n<p>EXISTS \u4f7f\u67e5\u8be2\u66f4\u4e3a\u8fc5\u901f,\u56e0\u4e3aRDBMS\u6838\u5fc3\u6a21\u5757\u5c06\u5728\u5b50\u67e5\u8be2\u7684\u6761\u4ef6\u4e00\u65e6\u6ee1\u8db3\u540e,\u7acb\u523b\u8fd4\u56de\u7ed3\u679c\u3002\u56e0\u6b64\u5982\u679c\u4e0d\u662f\u7279\u522b\u7814\u7a76\u548c\u8ffd\u6c42\u901f\u5ea6\u7684\u8bdd\uff08\u4f8b\u5982\uff1a\u6570\u636e\u8f6c\u6362\uff09\uff0c\u67e5\u8be2\u4e00\u4e2a\u8868\u7684\u6570\u636e\u9700\u8981\u5173\u8054\u5176\u4ed6\u8868\u7684\u8fd9\u79cd\u60c5\u51b5\u67e5\u8be2\uff0c\u5efa\u8bae\u91c7\u7528EXISTS\u7684\u65b9\u5f0f\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891210\"><\/a>\u51cf\u5c11\u5bf9\u8868\u7684\u67e5\u8be2<\/h3>\n<p>\u8be5\u95ee\u9898\u662f\u6211\u4eec\u7f16\u7a0b\u4e2d\u51fa\u73b0\u8fc7\u7684\u95ee\u9898\uff0c\u8bf7\u5927\u5bb6\u4e00\u5b9a\u6ce8\u610f\uff0c\u5e76\u4e14\u8be5\u7c7b\u95ee\u9898\u4f18\u5316\u53ef\u4ee5\u5e26\u6765\u8f83\u5927\u6027\u80fd\u7684\u63d0\u5347\u3002<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>\u4f4e\u6548<br \/>\ncursor cur_kc24_mz is<\/p>\n<p>Select akc260<\/p>\n<p>from kc24<\/p>\n<p>where akb020 =str_akb020<\/p>\n<p>and aka130=\u201911\u2019;<\/p>\n<p>cursor cur_kc24_zy is<\/p>\n<p>Select akc260<\/p>\n<p>from kc24<\/p>\n<p>where akb020 =str_akb020<\/p>\n<p>and aka130=\u201921\u2019;<\/p>\n<p>for rec_mz in cur_kc24_mz loop<\/p>\n<p>\u95e8\u8bca\u5904\u7406\u2026..<\/p>\n<p>end loop;<br \/>\nfor rec_mz in cur_kc24_zy loop<\/p>\n<p>\u4f4f\u9662\u5904\u7406\u2026..<\/p>\n<p>end loop;<br \/>\n\u9ad8\u6548<br \/>\ncursor cur_kc24 is<\/p>\n<p>Select akc260,aka130<\/p>\n<p>from kc24<\/p>\n<p>where akb020 =str_akb020<\/p>\n<p>and aka130 in (\u201911\u2019,\u201921\u2019);<\/p>\n<p>for rec_kc24 in cur_kc24 loop<\/p>\n<p>if rec_kc24.aka130=\u201911\u2019 then<\/p>\n<p>\u95e8\u8bca\u5904\u7406\u2026..<\/p>\n<p>end if;<\/p>\n<p>if rec_kc24.aka130=\u201921\u2019 then<\/p>\n<p>\u4f4f\u9662\u5904\u7406\u2026..<\/p>\n<p>end if;<\/p>\n<p>end loop;<\/p>\n<p>\u9ad8\u6548\u7684\u505a\u6cd5\u4f7f\u7528\u540c\u6837\u7684\u6761\u4ef6\uff08\u6216\u8005\u8bf4\u662f\u7d22\u5f15\uff09\u53ea\u8bbf\u95ee\u4e00\u6b21\u78c1\u76d8\uff0c\u4f4e\u6548\u7684\u505a\u6cd5\u8bbf\u95ee\u4e862\u6b21\u78c1\u76d8\uff0c\u8fd9\u6837\u901f\u5ea6\u5dee\u522b\u5c06\u8fd12\u500d\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891211\"><\/a>\u907f\u514d\u5faa\u73af\uff08\u6e38\u6807\uff09\u91cc\u9762\u5d4c\u67e5\u8be2<\/h3>\n<p>\u6e38\u6807\u91cc\u9762\u4e0d\u80fd\u5d4c\u5165\u67e5\u8be2(\u6216\u8005\u518d\u5d4c\u6e38\u6807)\uff0c\u5176\u5b9e\u4e5f\u4e0d\u80fd\u6709update delete\u7b49\u8bed\u53e5\uff0c\u53ea\u80fd\u6709insert\u8bed\u53e5\u3002\u4f46\u5728\u5b9e\u9645\u7684\u7f16\u7a0b\u60c5\u51b5\u4e0b\u662f\u4e0d\u53ef\u80fd\u5b8c\u5168\u907f\u514d\u7684\uff0c\u4f46\u6211\u4eec\u4e00\u5b9a\u8981\u5c3d\u91cf\u907f\u514d\u3002\u8be5\u7c7b\u95ee\u9898\u4e5f\u662f\u6211\u4eec\u7a0b\u5e8f\u4e2d\u51fa\u73b0\u8fc7\u7684\u95ee\u9898\uff0c\u8be5\u7c7b\u95ee\u9898\u4e5f\u53ef\u4ee5\u5927\u5927\u63d0\u5347\u7a0b\u5e8f\u6548\u7387\uff0c\u8bf7\u5927\u5bb6\u4e00\u5b9a\u6ce8\u610f\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<p>\u4f4e\u6548\uff1a<\/p>\n<p>Cursor cur_ac04 is<\/p>\n<p>Select aac001,akc010<\/p>\n<p>From ac04<\/p>\n<p>Where aab001= prm_aab001;<\/p>\n<p>\u2026\u2026<\/p>\n<p>For rec_ac04 in cur_ac04 loop<\/p>\n<p>Select aac008<\/p>\n<p>Into str_aac008<\/p>\n<p>from ac01<\/p>\n<p>where aac001=rec_ac04.aac001;<\/p>\n<p>if str_aac008=\u20191\u2019 then<\/p>\n<p>n_jfje := rec_ac04.akc010*0.08;<\/p>\n<p>end if;<\/p>\n<p>if str_aac008=\u20192\u2019 then<\/p>\n<p>n_jfje := rec_ac04.akc010*0.1;<\/p>\n<p>end if;<\/p>\n<p>End loop;<\/p>\n<p>\u9ad8\u6548\uff1a<\/p>\n<p>Cursor cur_ac04 is<\/p>\n<p>Select ac01.aac001,ac04.akc010,ac01.aac008<\/p>\n<p>From ac04,ac01<\/p>\n<p>Where ac04.aac001=ac01.aac001<\/p>\n<p>and aab001= prm_aab001;<\/p>\n<p>\u2026\u2026<\/p>\n<p>For rec_ac04 in cur_ac04 loop<\/p>\n<p>if rec.aac008=\u20191\u2019 then<\/p>\n<p>n_jfje := rec_ac04.akc010*0.08;<\/p>\n<p>end if;<\/p>\n<p>if rec.aac008=\u20192\u2019 then<\/p>\n<p>n_jfje := rec_ac04.akc010*0.1;<\/p>\n<p>end if;<\/p>\n<p>end loop;<\/p>\n<p>\u4f18\u5316\u7684\u65b9\u6cd5\u662f\u5c3d\u91cf\u628a\u6e38\u6807\u5faa\u73af\u4e2d\u7684\u67e5\u8be2\u8bed\u53e5\u653e\u5230\u6e38\u6807\u67e5\u8be2\u4e2d\u4e00\u8d77\u67e5\u8be2\u51fa\u6765\uff0c\u8fd9\u6837\u76f8\u5f53\u4e8e\u53ea\u8bbf\u95ee\u4e861\u6b21\u78c1\u76d8\u8bfb\u5230\u5185\u5b58\uff1b\u5982\u679c\u653e\u5230\u6e38\u6807\u4e2d\u7684\u8bdd\uff0c\u5047\u5982\u6e38\u6807\u6709100\u4e07\u6570\u636e\u91cf\uff0c\u90a3\u4e48\u7a0b\u5e8f\u9700\u8981100\u4e07\u6b21\u78c1\u76d8\uff0c\u53ef\u4ee5\u60f3\u8c61\u6d6a\u8d39\u4e86\u591a\u5c11IO\u7684\u8bbf\u95ee\u3002<\/p>\n<p>\u5982\u679c\u5728\u7a0b\u5e8f\u7f16\u5199\u4e0a\u6ca1\u6709\u529e\u6cd5\u907f\u514d\u6e38\u6807\u4e2d\u6709\u67e5\u8be2\u8bed\u53e5\u7684\u8bdd\uff08\u4e00\u822c\u60c5\u51b5\u662f\u53ef\u4ee5\u907f\u514d\u7684\uff09\uff0c\u90a3\u4e48\u4e5f\u8981\u4fdd\u8bc1\u6e38\u6807\u4e2d\u7684\u67e5\u8be2\u4f7f\u7528\u7684\u7d22\u5f15\uff08\u5373\u67e5\u8be2\u901f\u5ea6\u975e\u5e38\u5feb\uff09\uff0c\u4f8b\u5982\uff1a\u6e38\u6807100\u4e07\u6570\u636e\u91cf\uff0c\u6e38\u6807\u4e2d\u7684\u67e5\u8be2\u8bed\u53e5\u6267\u884c\u9700\u89810.02\u79d2\uff0c\u4ece\u8fd9\u4e2a\u901f\u5ea6\u4e0a\u6765\u8bf4\u662f\u5f88\u5feb\u7684\uff0c\u4f46\u603b\u4f53\u4e0a\u770b100\u4e07*0.02\u79d2=2\u4e07\u79d2=5\u5c0f\u65f633\u5206\u949f\uff0c\u5982\u679c\u5199\u4e00\u4e2a\u4e0d\u591f\u4f18\u5316\u7684\u8bed\u53e5\u9700\u89811\u79d2\uff0c\u90a3\u4e48\u9700\u8981\u51e0\u5929\u80fd\u6267\u884c\u5b8c\u5462\uff1f<\/p>\n<h3><a id=\"post-6566-_Toc205891212\"><\/a>\u5c3d\u91cf\u7528union all\u66ff\u6362union<\/h3>\n<p>Union\u4f1a\u53bb\u6389\u91cd\u590d\u7684\u8bb0\u5f55\uff0c\u4f1a\u6709\u6392\u5e8f\u7684\u52a8\u4f5c\uff0c\u4f1a\u6d6a\u8d39\u65f6\u95f4\u3002\u56e0\u6b64\u5728\u6ca1\u6709\u91cd\u590d\u8bb0\u5f55\u7684\u60c5\u51b5\u4e0b\u6216\u53ef\u4ee5\u5141\u8bb8\u6709\u91cd\u590d\u8bb0\u5f55\u7684\u8bdd\uff0c\u8981\u5c3d\u91cf\u91c7\u7528union all\u6765\u5173\u8054\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891213\"><\/a>\u4f7f\u7528DECODE\u51fd\u6570\u6765\u51cf\u5c11\u5904\u7406\u65f6\u95f4<\/h3>\n<p>\u4f7f\u7528DECODE\u51fd\u6570\u53ef\u4ee5\u907f\u514d\u91cd\u590d\u626b\u63cf\u76f8\u540c\u8bb0\u5f55\u6216\u91cd\u590d\u8fde\u63a5\u76f8\u540c\u7684\u8868.<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>\uff08\u4f4e\u6548)<br \/>\nselect count(1) from ac01 where aab001=\u2019100001\u2019 and aac008=\u20191\u2019;<br \/>\nselect count(1) from ac01 where aab001=\u2019100001\u2019 and aac008=\u20192\u2019;<br \/>\n\uff08\u4f4e\u6548)<\/p>\n<p>Select count(1),aac008<\/p>\n<p>From ac01<\/p>\n<p>Where aab001=\u2019100001\u2019<\/p>\n<p>and aac008 in (\u20191\u2019,\u20192\u2019)<\/p>\n<p>group by aac008;<\/p>\n<p>\uff08\u9ad8\u6548\uff09<br \/>\nselect count(decode(aac008,\u20191\u2019,\u20191\u2019,null)) zz,<\/p>\n<p>count(decode(aac008,\u20192\u2019,\u20191\u2019,null)) tx<\/p>\n<p>from ac01<\/p>\n<p>where aab001=\u2019100001\u2019;<\/p>\n<p>\u7279\u522b\u8bf4\u660e\uff1a<\/p>\n<p>group by\u548corder by \u90fd\u4f1a\u5f71\u54cd\u6027\u80fd\uff0c\u7f16\u7a0b\u65f6\u5c3d\u91cf\u907f\u514d\u6ca1\u6709\u5fc5\u8981\u7684\u5206\u7ec4\u548c\u6392\u5e8f\uff0c\u6216\u8005\u901a\u8fc7\u5176\u4ed6\u7684\u6709\u6548\u7684\u7f16\u7a0b\u529e\u6cd5\u53bb\u66ff\u6362\uff0c\u6bd4\u5982\u4e0a\u9762\u7684\u5904\u7406\u529e\u6cd5\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891214\"><\/a>group by\u4f18\u5316<\/h3>\n<p>Group by\u9700\u8981\u67e5\u8be2\u540e\u6392\u5e8f\uff0c\u901f\u5ea6\u6162\u5f71\u54cd\u6027\u80fd\uff0c\u5982\u679c\u67e5\u8be2\u6570\u636e\u91cf\u5927\uff0c\u5e76\u4e14\u5206\u7ec4\u590d\u6742\uff0c\u8fd9\u6837\u7684\u67e5\u8be2\u8bed\u53e5\u5728\u6027\u80fd\u4e0a\u662f\u6709\u95ee\u9898\u7684\u3002<\/p>\n<p>\u5c3d\u91cf\u907f\u514d\u4f7f\u7528\u5206\u7ec4\u6216\u8005\u91c7\u7528\u4e0a\u9762\u7684\u4e00\u8282\u7684\u529e\u6cd5\u53bb\u4ee3\u66ff\u3002<\/p>\n<p>\u91c7\u7528group by\u7684\u4e5f\u4e00\u5b9a\u8981\u8fdb\u884c\u4f18\u5316\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<p>\u4f4e\u6548<\/p>\n<p>select ac04.aac001,ac01.aac002,ac01.aac003,sum(aac040),ac01.aab001<br \/>\nfrom ac04,ac01<br \/>\nwhere ac04.aac001=ac01.aac001 and ac01.aab001=&#8217;1000000370&#8242;<br \/>\ngroup by ac04.aac001,ac01.aac002,ac01.aac003,ac01.aab001;<\/p>\n<p>\u9ad8\u6548\uff1a<\/p>\n<p>select ac04.aac001,ac01.aac002,ac01.aac003,gzze,ac01.aab001<br \/>\nfrom (select aac001,sum(aac040) gzze from ac04 group by aac001) ac04,ac01<br \/>\nwhere ac04.aac001=ac01.aac001<br \/>\nand aab001=&#8217;1000000370&#8242;;<\/p>\n<h3><a id=\"post-6566-_Toc205891215\"><\/a>\u5c3d\u91cf\u907f\u514d\u7528order by<\/h3>\n<p>Order by\u9700\u8981\u67e5\u8be2\u540e\u6392\u5e8f\uff0c\u901f\u5ea6\u6162\u5f71\u54cd\u6027\u80fd\uff0c\u5982\u679c\u67e5\u8be2\u6570\u636e\u91cf\u5927\uff0c\u6392\u5e8f\u7684\u65f6\u95f4\u5c31\u5f88\u957f\u3002\u4f46\u6211\u4eec\u4e5f\u4e0d\u80fd\u907f\u514d\u4e0d\u4f7f\u7528\uff0c\u8fd9\u6837\u5927\u5bb6\u4e00\u5b9a\u6ce8\u610f\u4e00\u70b9\u7684\u662f\u5982\u679c\u4f7f\u7528order by\u90a3\u4e48\u6392\u5e8f\u7684\u5217\u8868\u5fc5\u987b\u7b26\u5408\u7d22\u5f15\uff0c\u8fd9\u6837\u5728\u901f\u5ea6\u4e0a\u4f1a\u5f97\u5230\u5f88\u5927\u7684\u63d0\u5347\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891216\"><\/a>\u7528Where\u5b50\u53e5\u66ff\u6362HAVING\u5b50\u53e5<\/h3>\n<p>\u907f\u514d\u4f7f\u7528HAVING\u5b50\u53e5, HAVING \u53ea\u4f1a\u5728\u68c0\u7d22\u51fa\u6240\u6709\u8bb0\u5f55\u4e4b\u540e\u624d\u5bf9\u7ed3\u679c\u96c6\u8fdb\u884c\u8fc7\u6ee4. \u8fd9\u4e2a\u5904\u7406\u9700\u8981\u6392\u5e8f,\u603b\u8ba1\u7b49\u64cd\u4f5c. \u5982\u679c\u80fd\u901a\u8fc7WHERE\u5b50\u53e5\u9650\u5236\u8bb0\u5f55\u7684\u6570\u76ee,\u90a3\u5c31\u80fd\u51cf\u5c11\u8fd9\u65b9\u9762\u7684\u5f00\u9500.<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>\u4f4e\u6548:<br \/>\nSELECT aac008,count(1)<br \/>\nFROM ac01<br \/>\nGROUP BY aac008<br \/>\nHAVING aac008 in (\u20181\u2019,\u20192\u2019);<\/p>\n<p>\u9ad8\u6548<br \/>\nSELECT aac008,count(1)<br \/>\nFROM ac01<\/p>\n<p>Where aac008 in (\u20181\u2019,\u20192\u2019)<br \/>\nGROUP BY aac008 ;<\/p>\n<p>HAVING \u4e2d\u7684\u6761\u4ef6\u4e00\u822c\u7528\u4e8e\u5bf9\u4e00\u4e9b\u96c6\u5408\u51fd\u6570\u7684\u6bd4\u8f83,\u5982COUNT() \u7b49\u7b49. \u9664\u6b64\u800c\u5916,\u4e00\u822c\u7684\u6761\u4ef6\u5e94\u8be5\u5199\u5728WHERE\u5b50\u53e5\u4e2d<\/p>\n<h3><a id=\"post-6566-_Toc205891217\"><\/a>\u4f7f\u7528\u8868\u7684\u522b\u540d(Alias)<\/h3>\n<p>\u5f53\u5728SQL\u8bed\u53e5\u4e2d\u8fde\u63a5\u591a\u4e2a\u8868\u65f6, \u8bf7\u4f7f\u7528\u8868\u7684\u522b\u540d\u5e76\u628a\u522b\u540d\u524d\u7f00\u4e8e\u6bcf\u4e2aColumn\u4e0a.\u8fd9\u6837\u4e00\u6765,\u5c31\u53ef\u4ee5\u51cf\u5c11\u89e3\u6790\u7684\u65f6\u95f4\u5e76\u51cf\u5c11\u90a3\u4e9b\u7531Column\u6b67\u4e49\u5f15\u8d77\u7684\u8bed\u6cd5\u9519\u8bef.<\/p>\n<h3><a id=\"post-6566-_Toc205891218\"><\/a>\u5220\u9664\u91cd\u590d\u8bb0\u5f55<\/h3>\n<p>\u4e00\u822c\u6570\u636e\u8f6c\u6362\u7684\u7a0b\u5e8f\u7ecf\u5e38\u4f1a\u4f7f\u7528\u5230\u8be5\u65b9\u6cd5\u3002<\/p>\n<p>\u6700\u9ad8\u6548\u7684\u5220\u9664\u91cd\u590d\u8bb0\u5f55\u65b9\u6cd5 ( \u56e0\u4e3a\u4f7f\u7528\u4e86ROWID)<\/p>\n<p>DELETE FROM ac01 a<br \/>\nWHERE a.rowid &gt; (SELECT MIN(b.rowid)<br \/>\nFROM ac01 b<br \/>\nWHERE a.aac002=b.aac002<\/p>\n<p>and a.aac003=b.aac003 );<\/p>\n<h3><a id=\"post-6566-_Toc205891219\"><\/a>COMMIT\u4f7f\u7528<\/h3>\n<p>\u6570\u636e\u8f6c\u6362\u7684\u7a0b\u5e8f\u9700\u8981\u5173\u6ce8\u8fd9\u4e00\u70b9\u3002<\/p>\n<ol>\n<li>Commit\u6267\u884c\u4e5f\u662f\u6709\u65f6\u95f4\u7684\uff0c\u4e0d\u8fc7\u65f6\u95f4\u7279\u522b\u77ed\uff0c\u4f46\u63d0\u4ea4\u9891\u7387\u7279\u522b\u5927\uff0c\u5fc5\u7136\u4e5f\u4f1a\u6d6a\u8d39\u65f6\u95f4\u3002<\/li>\n<li>commit\u53ef\u4ee5\u91ca\u653e\u8d44\u6e90\uff0c\u5728\u5927\u91cf\u6570\u636e\u66f4\u65b0\u65f6\uff0c\u5fc5\u987b\u53ca\u65f6\u63d0\u4ea4\u3002<br \/>\na. \u56de\u6eda\u6bb5\u4e0a\u7528\u4e8e\u6062\u590d\u6570\u636e\u7684\u4fe1\u606f.<br \/>\nb. \u88ab\u7a0b\u5e8f\u8bed\u53e5\u83b7\u5f97\u7684\u9501<br \/>\nc. redo log buffer \u4e2d\u7684\u7a7a\u95f4<br \/>\nd. ORACLE\u4e3a\u7ba1\u7406\u4e0a\u8ff03\u79cd\u8d44\u6e90\u4e2d\u7684\u5185\u90e8\u82b1\u8d39<\/li>\n<\/ol>\n<p>\u4f8b\u5982\uff1a<\/p>\n<p>Cur_ac20\u67095000\u4e07\u6570\u636e<\/p>\n<p>n_count :=0;<\/p>\n<p>For arec in cur_ac20 loop<\/p>\n<p>Insert into ac20 \u2026\u2026<\/p>\n<p>n_count := n_count + 1;<\/p>\n<p>If n_count = = 100000 then &#8211;10\u4e07\u4e00\u63d0\u4ea4<\/p>\n<p>commit;<\/p>\n<p>n_count := 0;<\/p>\n<p>End if;<\/p>\n<p>End loop;<\/p>\n<p>Commit;<\/p>\n<p>\u5982\u679c1\u6761\u4e00\u63d0\u4ea4\uff0c\u9700\u8981\u63d0\u4ea45000\u4e07\u5fc5\u7136\u6d6a\u8d39\u65f6\u95f4\uff1b\u5982\u679c\u6574\u4f53\u63d0\u4ea4\uff0c\u8d44\u6e90\u4e0d\u80fd\u91ca\u653e\uff0c\u6027\u80fd\u5fc5\u987b\u4e0b\u964d\u3002<\/p>\n<p>\u5728\u5b9e\u9645\u7f16\u7a0b\u65f6\uff0c\u5e94\u6ce8\u610f\u63d0\u4ea4\u7684\u6b21\u6570\u548c\u63d0\u4ea4\u7684\u6570\u636e\u91cf\u7684\u5e73\u8861\u5173\u7cfb\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891220\"><\/a>\u51cf\u5c11\u591a\u8868\u5173\u8054<\/h3>\n<p>\u8868\u5173\u8054\u7684\u8d8a\u591a\uff0c\u67e5\u8be2\u901f\u5ea6\u5c31\u8d8a\u6162\uff0c\u5c3d\u91cf\u51cf\u5c11\u591a\u4e2a\u8868\u7684\u5173\u8054\uff0c\u5efa\u8bae\u8868\u5173\u8054\u4e0d\u8981\u8d85\u8fc73\u4e2a\uff08\u5b50\u67e5\u8be2\u4e5f\u5c5e\u4e8e\u8868\u5173\u8054\uff09\u3002<\/p>\n<p>\u6570\u636e\u8f6c\u6362\u4e0a\u4f1a\u5b58\u5728\u5927\u6570\u636e\u91cf\u8868\u7684\u5173\u8054\uff0c\u5173\u8054\u591a\u4e86\u4f1a\u5f71\u54cd\u7d22\u5f15\u7684\u6548\u7387\uff0c\u53ef\u4ee5\u91c7\u7528\u5efa\u7acb\u4e34\u65f6\u8868\u7684\u529e\u6cd5\uff0c\u6709\u65f6\u66f4\u80fd\u63d0\u9ad8\u901f\u5ea6\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891221\"><\/a>\u6279\u91cf\u6570\u636e\u63d2\u5165<\/h3>\n<p>\u6570\u636e\u8f6c\u6362\u65f6\u6216\u8005\u5927\u4e1a\u52a1\u6570\u636e\u63d2\u5165\u65f6\uff0c\u6709\u4ee5\u4e0b\u51e0\u79cd\u529e\u6cd5\u8fdb\u884c\u6570\u636e\u63d2\u5165\uff08\u4e0d\u5305\u62ecimp\u3001impdp\u548csqlloader\uff09<\/p>\n<ul>\n<li>Insert into \u2026select \u65b9\u5f0f<\/li>\n<\/ul>\n<p>\u5c06\u67e5\u8be2\u7684\u7ed3\u679c\u4e00\u6b21\u63d2\u5165\u5230\u76ee\u6807\u8868\u4e2d\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<p>Insert into ac01_bak select * from ac01;<\/p>\n<p>\u7531\u4e8e\u662f\u4e00\u6b21\u67e5\u8be2\u4e00\u6b21\u63d2\u5165\uff0c\u5e76\u4e14\u6700\u540e\u4e00\u6b21\u63d0\u4ea4\uff0c\u4ed6\u7684\u901f\u5ea6\u8981\u6bd4\u4e0b\u9762\u63cf\u8ff0\u7684curosr\u7684\u65b9\u5f0f\u901f\u5ea6\u8981\u5feb\u3002\u4f46\u67e5\u8be2\u63d2\u5165\u7684\u6570\u636e\u91cf\u8fc7\u5927\u5fc5\u7136\u4f1a\u5360\u7528\u66f4\u591a\u7684\u5185\u5b58\u548cundo\u8868\u7a7a\u95f4\uff0c\u53ea\u80fd\u5728\u63d2\u5165\u5b8c\u6210\u540e\u63d0\u4ea4\uff0c\u8fd9\u6837\u8d44\u6e90\u4e0d\u80fd\u91ca\u653e\uff0c\u4f1a\u5bfc\u81f4\u56de\u6eda\u8868\u7a7a\u95f4\u4e0d\u8db3\u548c\u5feb\u7167\u8fc7\u65e7\u7684\u95ee\u9898\uff0c\u53e6\u5916\u4e00\u65e6\u5931\u8d25\u9700\u8981\u5168\u90e8\u56de\u6eda\u3002\u56e0\u6b64\u5efa\u8bae\u5c0f\u6570\u636e\u91cf\uff08\u4f8b\u5982\uff1a300\u4e07\u4ee5\u4e0b\uff09\u7684\u5bfc\u5165\u91c7\u7528\u8be5\u79cd\u65b9\u5f0f\u3002<\/p>\n<ul>\n<li>Insert \/*+append *\/ into \u2026 select\u65b9\u5f0f<\/li>\n<\/ul>\n<p>\u8be5\u79cd\u65b9\u5f0f\u540c\u4e0a\u79cd\u65b9\u5f0f\uff0c\u4e0d\u8fc7\u7531\u4e8e\u6709append\u7684\u63d0\u793a\uff0c\u8fd9\u79cd\u8bed\u53e5\u4e0d\u8d70\u56de\u6eda\u6bb5\u76f4\u63a5\u63d2\u5165\u6570\u636e\u6587\u4ef6\uff0c\u901f\u5ea6\u975e\u5e38\u5feb\u3002\u6ce8\u610f\u7cfb\u7edf\u5f00\u53d1\u7f16\u7a0b\u4e0d\u80fd\u4f7f\u7528\u8be5\u79cd\u65b9\u5f0f\uff0c\u6570\u636e\u8f6c\u6362\u53ef\u4ee5\u7075\u6d3b\u4f7f\u7528\u3002<\/p>\n<ul>\n<li>Cursor\u65b9\u5f0f<\/li>\n<\/ul>\n<p>\u5b9a\u4e49\u6e38\u6807\uff0c\u7136\u540e\u9010\u884c\u8fdb\u884c\u63d2\u5165\uff0c\u7136\u540e\u5b9a\u91cf\u63d0\u4ea4\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<p>Cusor cur_ac20 is<\/p>\n<p>Select * from ac20;<\/p>\n<p>\u2026.<\/p>\n<p>n_count :=0;<\/p>\n<p>For rec_ac20 in cur_ac20 loop<\/p>\n<p>Insert into ac20_bak<\/p>\n<p>(aac001,<\/p>\n<p>\u2026\u2026.)<\/p>\n<p>Values<\/p>\n<p>(rec_ac20.aac001,<\/p>\n<p>\u2026.);<\/p>\n<p>If n_count :==100000 then<\/p>\n<p>Commit;<\/p>\n<p>n_count :=0;<\/p>\n<p>End if;<\/p>\n<p>End loop;<\/p>\n<ul>\n<li>\u6279\u7ed1\u5b9a\u7684\u65b9\u5f0f<\/li>\n<\/ul>\n<p>\u901a\u8fc7\u6e38\u6807\u67e5\u8be2\u5c06\u6570\u636e\u9010\u884c\u5199\u5230\u6570\u7ec4\u91cc\uff08\u5b9e\u9645\u4e0a\u5c31\u662f\u5185\u5b58\uff09\uff0c\u7136\u540e\u901a\u8fc7\u6279\u7ed1\u5b9a\u7684\u8bed\u53e5forall \u2026 in\u2026 insert into\u2026values\u2026;\u5c06\u5185\u5b58\u7684\u6570\u636e\u4e00\u6b21\u5199\u5165\u5230\u6570\u636e\u6587\u4ef6\u4e2d\u3002\u76f8\u6bd4cursor\u7684\u65b9\u5f0f\u51cf\u5c11\u4e86\u5bf9io\u7684\u8bbf\u95ee\u6b21\u6570\uff0c\u63d0\u9ad8\u4e86\u901f\u5ea6\uff0c\u4f46\u6ce8\u610f\u5185\u5b58\u522b\u6ea2\u51fa\u4e86\u3002<\/p>\n<h2><a id=\"post-6566-_Toc205891222\"><\/a>\u7d22\u5f15\u4f7f\u7528\u4f18\u5316<\/h2>\n<p>\u5728\u5b9e\u9645\u7684\u5e94\u7528\u7cfb\u7edf\u4e2d\u7d22\u5f15\u95ee\u9898\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u53ef\u80fd\u80fd\u5360\u523080%\uff0c\u5728\u7a0b\u5e8f\u4f18\u5316\u4e0a\u7d22\u5f15\u95ee\u9898\u662f\u9700\u8981\u6211\u4eec\u7279\u522b\u5173\u6ce8\u7684\u3002\u672c\u8282\u4e3b\u8981\u63cf\u8ff0\u4ec0\u4e48\u60c5\u51b5\u7d22\u5f15\u4f1a\u4e0d\u751f\u6548\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891223\"><\/a>\u907f\u514d\u5728\u7d22\u5f15\u5217\u4e0a\u4f7f\u7528\u51fd\u6570\u6216\u8fd0\u7b97<\/h3>\n<p>\u8fd9\u4e2a\u95ee\u9898\u662f\u5728\u6211\u4eec\u5b9e\u9645\u7f16\u7a0b\u4e2d\u51fa\u73b0\u8fc7\u7684\uff0c\u8bf7\u5927\u5bb6\u4e00\u5b9a\u6ce8\u610f\u3002\u5728\u7d22\u5f15\u5217\u4e0a\u4f7f\u7528\u51fd\u6570\u6216\u8fd0\u7b97\uff0c\u67e5\u8be2\u6761\u4ef6\u90fd\u4e0d\u4f1a\u4f7f\u7528\u7d22\u5f15\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<p>\u4e0d\u4f7f\u7528\u7d22\u5f15<\/p>\n<p>Select * from ka02 where aka060=\u201910001000\u2019 and to_char(aae030,\u2019yyyymm\u2019)=\u2019200801\u2019;<\/p>\n<p>\u4f7f\u7528\u7d22\u5f15<\/p>\n<p>Select * from ka02 where aka060=\u201910001000\u2019 and aae030=to_date(\u2019200801\u2019,\u2019yyyymm\u2019);<\/p>\n<p>\u4e0d\u4f7f\u7528\u7d22\u5f15<\/p>\n<p>Select * from ka02 where aka060=\u201910001000\u2019 and aae031+1=sysdate;<\/p>\n<p>\u4f7f\u7528\u7d22\u5f15<\/p>\n<p>Select * from ac04 where aac001=\u201910001000\u2019 and aae031=sysdate -1;<\/p>\n<p>\u5982\u679c\u4e00\u5b9a\u8981\u5bf9\u4f7f\u7528\u51fd\u6570\u7684\u5217\u542f\u7528\u7d22\u5f15, ORACLE\u65b0\u7684\u529f\u80fd: \u57fa\u4e8e\u51fd\u6570\u7684\u7d22\u5f15(Function-Based Index)<\/p>\n<p>CREATE INDEX IDX_KA02_AKA066 ON KA02 (UPPER(AKA066)); \/*\u5efa\u7acb\u57fa\u4e8e\u51fd\u6570\u7684\u7d22\u5f15*\/<\/p>\n<p>SELECT * FROM KA02 WHERE UPPER(AKA066) = \u2018ASPL\u2019; \/*\u5c06\u4f7f\u7528\u7d22\u5f15*\/<\/p>\n<p>\u4e0d\u662f\u6781\u7279\u6b8a\u60c5\u51b5\uff0c\u5efa\u8bae\u4e0d\u8981\u4f7f\u7528\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891224\"><\/a>\u907f\u514d\u6539\u53d8\u7d22\u5f15\u5217\u7684\u7c7b\u578b.<\/h3>\n<p>\u7d22\u5f15\u5217\u7684\u6761\u4ef6\u5982\u679c\u7c7b\u578b\u4e0d\u5339\u914d\uff0c\u5219\u4e0d\u80fd\u4f7f\u7528\u7d22\u5f15\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<p>\u4e0d\u4f7f\u7528\u7d22\u5f15<\/p>\n<p>Select * from ac01 where aac001=10001000;<\/p>\n<p>\u4f7f\u7528\u7d22\u5f15<\/p>\n<p>Select * from ac01 where aac001=\u201910001000\u2019;<\/p>\n<h3><a id=\"post-6566-_Toc205891225\"><\/a>\u907f\u514d\u5728\u7d22\u5f15\u5217\u4e0a\u4f7f\u7528NOT<\/h3>\n<p>\u907f\u514d\u5728\u7d22\u5f15\u5217\u4e0a\u4f7f\u7528NOT, NOT\u4e0d\u4f1a\u4f7f\u67e5\u8be2\u6761\u4ef6\u4f7f\u7528\u7d22\u5f15\u3002\u5bf9\u4e8e!=\u8fd9\u6837\u7684\u5224\u65ad\u4e5f\u662f\u4e0d\u80fd\u4f7f\u7528\u7d22\u5f15\u7684\uff0c\u7d22\u5f15\u53ea\u80fd\u544a\u8bc9\u4f60\u4ec0\u4e48\u5b58\u5728\u4e8e\u8868\u4e2d, \u800c\u4e0d\u80fd\u544a\u8bc9\u4f60\u4ec0\u4e48\u4e0d\u5b58\u5728\u4e8e\u8868\u4e2d<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>\u4f4e\u6548: (\u8fd9\u91cc,\u4e0d\u4f7f\u7528\u7d22\u5f15)<\/p>\n<p>select *<\/p>\n<p>From ac02<\/p>\n<p>Where not aab019=\u201910\u2019;<\/p>\n<p>\u9ad8\u6548: (\u8fd9\u91cc,\u4f7f\u7528\u4e86\u7d22\u5f15)<br \/>\nselect *<\/p>\n<p>From ac02<\/p>\n<p>Where aab019 in (\u201920\u2019,\u201930\u2019);<\/p>\n<h3><a id=\"post-6566-_Toc205891226\"><\/a>\u7528&gt;=\u66ff\u4ee3&gt;<\/h3>\n<p>\u867d\u7136\u6548\u679c\u4e0d\u662f\u7279\u522b\u660e\u663e\uff0c\u4f46\u5efa\u8bae\u91c7\u7528\u8fd9\u79cd\u65b9\u5f0f<\/p>\n<p>\u4f4e\u6548:<\/p>\n<p>SELECT *<br \/>\nFROM ab01<br \/>\nWHERE aab019 &gt; \u201810\u2019<\/p>\n<p>\u9ad8\u6548:<br \/>\nSELECT *<br \/>\nFROM ab01<br \/>\nWHERE aab019 &gt;=\u201920\u2019<\/p>\n<p>\u4e24\u8005\u7684\u533a\u522b\u5728\u4e8e, \u524d\u8005DBMS\u9996\u5148\u5b9a\u4f4d\u5230aab019=10\u7684\u8bb0\u5f55\u5e76\u4e14\u5411\u524d\u626b\u63cf\u5230\u7b2c\u4e00\u4e2aaab019\u5927\u4e8e10\u7684\u8bb0\u5f55,\u800c\u540e\u8005DBMS\u5c06\u76f4\u63a5\u8df3\u5230\u7b2c\u4e00\u4e2aaab019\u7b49\u4e8e10\u7684\u8bb0\u5f55<\/p>\n<h3><a id=\"post-6566-_Toc205891227\"><\/a>\u907f\u514d\u5728\u7d22\u5f15\u5217\u4e0a\u4f7f\u7528IS NULL\u548cIS NOT NULL<\/h3>\n<p>\u5bf9\u4e8e\u7d22\u5f15\u5217\u4f7f\u7528is null\u6216is not null\u4e0d\u4f1a\u4f7f\u7528\u4e0a\u7d22\u5f15\uff0e \u56e0\u4e3a\u7a7a\u503c\u4e0d\u5b58\u5728\u4e8e\u7d22\u5f15\u5217\u4e2d,\u6240\u4ee5WHERE\u5b50\u53e5\u4e2d\u5bf9\u7d22\u5f15\u5217\u8fdb\u884c\u7a7a\u503c\u6bd4\u8f83\u5c06\u4f7fORACLE\u505c\u7528\u8be5\u7d22\u5f15.<\/p>\n<p>\u4e3e\u4f8b:<\/p>\n<p>\u4f4e\u6548: (\u7d22\u5f15\u5931\u6548)<\/p>\n<p>select * from ab01 where aab019 is not null;<\/p>\n<p>\u9ad8\u6548: (\u7d22\u5f15\u6709\u6548)<\/p>\n<p>select * from ab01 where aab019 in(\u201810\u2019,\u201920\u2019,\u201930\u2019);<\/p>\n<p>\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u5bf9\u4e8e\u8fd9\u7c7b\u7684\u95ee\u9898\u5f88\u96be\u907f\u514d\uff0c\u5982\u679c\u4e0d\u662f\u7279\u522b\u5f71\u54cd\u901f\u5ea6\u6216\u8005\u8981\u6c42\u901f\u5ea6\u7684\uff0c\u53ef\u4ee5\u5ffd\u7565\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891228\"><\/a>\u5e26\u901a\u914d\u7b26\uff08%\uff09\u7684like\u8bed\u53e5<\/h3>\n<p>%\u5728\u5e38\u91cf\u524d\u9762\u7d22\u5f15\u5c31\u4e0d\u4f1a\u4f7f\u7528\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<p>\u4e0d\u4f7f\u7528\u7d22\u5f15<\/p>\n<p>Select * from ac01 where aac002 like \u2018%210104\u2019;<\/p>\n<p>Select * from ac01 where aac002 like \u2018%210104%\u2019;<\/p>\n<p>\u4f7f\u7528\u7d22\u5f15<\/p>\n<p>Select * from ac01 where aac002 like \u2018210104%\u2019;<\/p>\n<h3><a id=\"post-6566-_Toc205891229\"><\/a>\u603b\u662f\u4f7f\u7528\u7d22\u5f15\u7684\u7b2c\u4e00\u4e2a\u5217<\/h3>\n<p>\u5982\u679c\u7d22\u5f15\u662f\u5efa\u7acb\u5728\u591a\u4e2a\u5217\u4e0a, \u53ea\u6709\u5728\u5b83\u7684\u7b2c\u4e00\u4e2a\u5217\u88abwhere\u5b50\u53e5\u5f15\u7528\u65f6,\u4f18\u5316\u5668\u624d\u4f1a\u9009\u62e9\u4f7f\u7528\u8be5\u7d22\u5f15\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<p>Ac02\u7684\u590d\u5408\u7d22\u5f15\uff1aaac001\u3001aae140\u3001aae041<\/p>\n<p>Select * from ac02 where aae140=\u201931\u2019 and aae041=\u2019200801\u2019; &#8211;\u4e0d\u4f1a\u4f7f\u7528\u7d22\u5f15<\/p>\n<p>Select * from ac02 where aac001=\u201910001000\u2019; &#8211;\u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15<\/p>\n<p>\u5982\u679c\u4e0d\u4f7f\u7528\u7d22\u5f15\u7b2c\u4e00\u5217\u57fa\u672c\u4e0a\u4e0d\u4f1a\u4f7f\u7528\u7d22\u5f15\uff0c\u4f7f\u7528\u7d22\u5f15\u8981\u6309\u7167\u7d22\u5f15\u7684\u987a\u5e8f\u4f7f\u7528\uff0c\u53e6\u5916\u4f7f\u7528\u590d\u5408\u7d22\u5f15\u7684\u5217\u8d8a\u591a\uff0c\u67e5\u8be2\u7684\u901f\u5ea6\u5c31\u8d8a\u5feb<\/p>\n<h3><a id=\"post-6566-_Toc205891230\"><\/a>\u591a\u4e2a\u5e73\u7b49\u7684\u7d22\u5f15<\/h3>\n<p>\u5f53SQL\u8bed\u53e5\u7684\u6267\u884c\u8def\u5f84\u53ef\u4ee5\u4f7f\u7528\u5206\u5e03\u5728\u591a\u4e2a\u8868\u4e0a\u7684\u591a\u4e2a\u7d22\u5f15\u65f6, ORACLE\u4f1a\u540c\u65f6\u4f7f\u7528\u591a\u4e2a\u7d22\u5f15\u5e76\u5728\u8fd0\u884c\u65f6\u5bf9\u5b83\u4eec\u7684\u8bb0\u5f55\u8fdb\u884c\u5408\u5e76, \u68c0\u7d22\u51fa\u4ec5\u5bf9\u5168\u90e8\u7d22\u5f15\u6709\u6548\u7684\u8bb0\u5f55.<\/p>\n<p>\u5728ORACLE\u9009\u62e9\u6267\u884c\u8def\u5f84\u65f6,\u552f\u4e00\u6027\u7d22\u5f15\u7684\u7b49\u7ea7\u9ad8\u4e8e\u975e\u552f\u4e00\u6027\u7d22\u5f15. \u7136\u800c\u8fd9\u4e2a\u89c4\u5219\u53ea\u6709<\/p>\n<p>\u5f53WHERE\u5b50\u53e5\u4e2d\u7d22\u5f15\u5217\u548c\u5e38\u91cf\u6bd4\u8f83\u624d\u6709\u6548.\u5982\u679c\u7d22\u5f15\u5217\u548c\u5176\u4ed6\u8868\u7684\u7d22\u5f15\u7c7b\u76f8\u6bd4\u8f83. \u8fd9\u79cd\u5b50\u53e5\u5728\u4f18\u5316\u5668\u4e2d\u7684\u7b49\u7ea7\u662f\u975e\u5e38\u4f4e\u7684.<\/p>\n<p>\u5982\u679c\u4e0d\u540c\u8868\u4e2d\u4e24\u4e2a\u76f8\u540c\u7b49\u7ea7\u7684\u7d22\u5f15\u5c06\u88ab\u5f15\u7528, FROM\u5b50\u53e5\u4e2d\u8868\u7684\u987a\u5e8f\u5c06\u51b3\u5b9a\u54ea\u4e2a\u4f1a\u88ab\u7387\u5148\u4f7f\u7528. FROM\u5b50\u53e5\u4e2d\u6700\u540e\u7684\u8868\u7684\u7d22\u5f15\u5c06\u6709\u6700\u9ad8\u7684\u4f18\u5148\u7ea7.<\/p>\n<p>\u5982\u679c\u540c\u4e00\u8868\u4e2d\u6709\u4e24\u4e2a\u76f8\u540c\u7b49\u7ea7\u7684\u7d22\u5f15\u88ab\u5f15\u7528\uff0coracle\u4f1a\u5206\u6790\u6700\u6709\u6548\u7684\u7d22\u5f15\u53bb\u5f15\u7528\uff0c\u5176\u4ed6\u7684\u7d22\u5f15\u4e0d\u4f1a\u4f7f\u7528\uff0c\u5982\u679c\u8fd9\u4e9b\u76f8\u540c\u7b49\u7ea7\u7684\u7d22\u5f15\u6548\u679c\u5dee\u4e0d\u591a\uff0coracle\u53ef\u80fd\u4f1a\u81ea\u52a8\u5408\u5e76\u8fdb\u884c\u4f7f\u7528\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891231\"><\/a>\u4e0d\u660e\u786e\u7684\u7d22\u5f15\u7b49\u7ea7<\/h3>\n<p>\u5f53ORACLE\u65e0\u6cd5\u5224\u65ad\u7d22\u5f15\u7684\u7b49\u7ea7\u9ad8\u4f4e\u5dee\u522b,\u4f18\u5316\u5668\u5c06\u53ea\u4f7f\u7528\u4e00\u4e2a\u7d22\u5f15,\u5b83\u5c31\u662f\u5728WHERE\u5b50\u53e5\u4e2d\u88ab\u5217\u5728\u6700\u524d\u9762\u7684.<\/p>\n<h3><a id=\"post-6566-_Toc205891232\"><\/a>\u81ea\u52a8\u9009\u62e9\u7d22\u5f15<\/h3>\n<p>\u5982\u679c\u8868\u4e2d\u6709\u4e24\u4e2a\u4ee5\u4e0a\uff08\u5305\u62ec\u4e24\u4e2a\uff09\u7d22\u5f15\uff0c\u5176\u4e2d\u6709\u4e00\u4e2a\u552f\u4e00\u6027\u7d22\u5f15\uff0c\u800c\u5176\u4ed6\u662f\u975e\u552f\u4e00\u6027\uff0e<\/p>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cORACLE\u5c06\u4f7f\u7528\u552f\u4e00\u6027\u7d22\u5f15\u800c\u5b8c\u5168\u5ffd\u7565\u975e\u552f\u4e00\u6027\u7d22\u5f15\uff0e<\/p>\n<h3><a id=\"post-6566-_Toc205891233\"><\/a>\u4f7f\u7528\u63d0\u793a(Hints)<\/h3>\n<p>\u5bf9\u4e8e\u8868\u7684\u8bbf\u95ee,\u53ef\u4ee5\u4f7f\u7528\u4e24\u79cdHints. FULL \u548c ROWID<br \/>\nFULL hint \u544a\u8bc9ORACLE\u4f7f\u7528\u5168\u8868\u626b\u63cf\u7684\u65b9\u5f0f\u8bbf\u95ee\u6307\u5b9a\u8868.<br \/>\n\u4f8b\u5982:<\/p>\n<p>SELECT \/*+ FULL(AC01) *\/ *<br \/>\nFROM AC01<br \/>\nWHERE AAC001 = \u201810001000\u2019;<\/p>\n<p>\u5982\u679c\u4e00\u4e2a\u5927\u8868\u6ca1\u6709\u88ab\u8bbe\u5b9a\u4e3a\u7f13\u5b58(CACHED)\u8868\u800c\u4f60\u5e0c\u671b\u5b83\u7684\u6570\u636e\u5728\u67e5\u8be2\u7ed3\u675f\u662f\u4ecd\u7136\u505c\u7559<br \/>\n\u5728SGA\u4e2d,\u4f60\u5c31\u53ef\u4ee5\u4f7f\u7528CACHE hint \u6765\u544a\u8bc9\u4f18\u5316\u5668\u628a\u6570\u636e\u4fdd\u7559\u5728SGA\u4e2d. \u901a\u5e38CACHE hint \u548c FULL hint \u4e00\u8d77\u4f7f\u7528.<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>SELECT \/*+ FULL(AC01) CACHE(AC01)*\/ *<br \/>\nFROM AC01;<\/p>\n<p>ROWID hint \u544a\u8bc9ORACLE\u4f7f\u7528TABLE ACCESS BY ROWID\u7684\u64cd\u4f5c\u8bbf\u95ee\u8868.<br \/>\n\u91c7\u7528TABLE ACCESS BY ROWID\u7684\u65b9\u5f0f\u7279\u522b\u662f\u5f53\u8bbf\u95ee\u5927\u8868\u7684\u65f6\u5019, \u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f, \u4f60\u9700\u8981\u77e5\u9053ROIWD\u7684\u503c\u6216\u8005\u4f7f\u7528\u7d22\u5f15.<\/p>\n<p>\u7d22\u5f15hint \u544a\u8bc9ORACLE\u4f7f\u7528\u57fa\u4e8e\u7d22\u5f15\u7684\u626b\u63cf\u65b9\u5f0f. \u4f60\u4e0d\u5fc5\u8bf4\u660e\u5177\u4f53\u7684\u7d22\u5f15\u540d\u79f0<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>SELECT \/*+index(IDX_AC01_AAC002)*\/ aac001<br \/>\nFROM AC01<br \/>\nWHERE aac002=&#8217;2101111111111111111&#8242;;<\/p>\n<p>\u5728\u4e0d\u4f7f\u7528hint\u7684\u60c5\u51b5\u4e0b, \u4ee5\u4e0a\u7684\u67e5\u8be2\u5e94\u8be5\u4e5f\u4f1a\u4f7f\u7528\u7d22\u5f15,\u7136\u800c,\u5982\u679c\u8be5\u7d22\u5f15\u7684\u91cd\u590d\u503c\u8fc7\u591a\u800c\u4f60\u7684\u4f18\u5316\u5668\u662fCBO, \u4f18\u5316\u5668\u5c31\u53ef\u80fd\u5ffd\u7565\u7d22\u5f15. \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b, \u4f60\u53ef\u4ee5\u7528INDEX hint\u5f3a\u5236ORACLE\u4f7f\u7528\u8be5\u7d22\u5f15.<\/p>\n<p>ORACLE hints \u8fd8\u5305\u62ecALL_ROWS, FIRST_ROWS, RULE,USE_NL, USE_MERGE, USE_HASH \u7b49\u7b49.<\/p>\n<p>\u4f7f\u7528hint , \u8868\u793a\u6211\u4eec\u5bf9ORACLE\u4f18\u5316\u5668\u7f3a\u7701\u7684\u6267\u884c\u8def\u5f84\u4e0d\u6ee1\u610f,\u9700\u8981\u624b\u5de5\u4fee\u6539.<br \/>\n\u8fd9\u662f\u4e00\u4e2a\u5f88\u6709\u6280\u5de7\u6027\u7684\u5de5\u4f5c. \u9664\u975e\u7279\u5b9a\u7684\u60c5\u51b5\uff0c\u4f8b\u5982\uff1a\u6570\u636e\u8f6c\u6362\uff0c\u5176\u4ed6\u60c5\u51b5\u6700\u597d\u4e0d\u7528.<\/p>\n<h3><a id=\"post-6566-_Toc205891234\"><\/a>\u8868\u4e0a\u5b58\u5728\u8fc7\u65e7\u7684\u5206\u6790<\/h3>\n<p>\u6211\u4eec\u73b0\u5728\u5f88\u591a\u9879\u76ee\u90fd\u5b58\u5728\u6027\u80fd\u95ee\u9898\uff0c\u5176\u4e2d\u6709\u5f88\u591a\u79cd\u60c5\u51b5\u90fd\u662f\u7531\u4e8e\u5206\u6790\u8fc7\u65e7\u5bfc\u81f4ORACLE\u5224\u65ad\u7d22\u5f15\u7ea7\u522b\u548c\u8d44\u6e90\u6210\u672c\u4e0a\u51fa\u73b0\u95ee\u9898\uff0c\u4f1a\u5bfc\u81f4ORACLE\u5224\u65ad\u9519\u8bef\u4e0d\u4f7f\u7528\u7d22\u5f15\u3002\u6211\u4e2a\u4eba\u89c9\u5f97\u8fd9\u662fORACLE\u4e0d\u591f\u5b8c\u5584\u7684\u5730\u65b9\u3002<\/p>\n<p>\u89e3\u51b3\u529e\u6cd5\uff1a<\/p>\n<p>\u7b2c\u4e00\u79cd\u529e\u6cd5\uff1a\u5220\u9664\u5206\u6790\uff0c\u505c\u6b62oracle10g\u7684\u81ea\u52a8\u5206\u6790\uff0c\u4f46\u4e0d\u4f7f\u7528\u5206\u6790\uff0coracle\u8bbf\u95ee\u6570\u636e\u7684CPU\u6d88\u8017\u5c31\u8fc7\u5927\u3002<\/p>\n<p>\u7b2c\u4e8c\u79cd\u529e\u6cd5\uff1a\u91cd\u65b0\u5206\u6790\uff0c\u4f46\u8fc7\u957f\u65f6\u95f4\u540e\uff0c\u7d22\u5f15\u662f\u5426\u4f1a\u518d\u6b21\u5931\u6548\uff0c\u6ca1\u6709\u9a8c\u8bc1\u8fc7\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891235\"><\/a>\u8868\u4e0a\u5b58\u5728\u5e76\u884c<\/h3>\n<p>\u8868\u4e0a\u5b58\u5728\u5e76\u884c\uff0cORACLE\u5224\u65ad\u7d22\u5f15\u7ea7\u522b\u548c\u8d44\u6e90\u6210\u672c\u4e0a\u51fa\u73b0\u95ee\u9898\uff0c\u4f1a\u5bfc\u81f4ORACLE\u5224\u65ad\u9519\u8bef\u4e0d\u4f7f\u7528\u7d22\u5f15\u3002<\/p>\n<p>\u8fd9\u4e2a\u95ee\u9898\u6211\u4e0d\u77e5\u9053\u6709\u4ec0\u4e48\u597d\u7684\u5904\u7406\u529e\u6cd5\uff0c\u4ece\u73b0\u573a\u5b9e\u9645\u5e94\u7528\u901f\u5ea6\u89d2\u5ea6\u6bd4\u8f83\uff0c\u6211\u8fd8\u662f\u9009\u62e9\u53bb\u6389\u5e76\u884c\uff0c\u56e0\u4e3a\u4e0d\u4f7f\u7528\u7d22\u5f15\u8fdb\u884c\u5168\u8868\u626b\u63cf\u80af\u5b9a\u662f\u4e0d\u80fd\u5fcd\u53d7\u7684\u3002<\/p>\n<h3><a id=\"post-6566-_Toc205891236\"><\/a>\u5173\u4e8e\u7d22\u5f15\u5efa\u7acb<\/h3>\n<p>\u7d22\u5f15\u7684\u4f7f\u7528\u662f\u80af\u5b9a\u4f1a\u5927\u5927\u63d0\u9ad8\u67e5\u8be2\u7684\u901f\u5ea6\uff0c\u4f46\u7d22\u5f15\u5176\u5b9e\u4e5f\u662f\u4e00\u79cd\u6570\u636e\uff0c\u5b83\u4e5f\u662f\u5b58\u653e\u7684\u7528\u6237\u7c7b\u578b\u7684\u8868\u7a7a\u95f4\u4e0b\u7684\uff0c\u7d22\u5f15\u5efa\u7acb\u7684\u8d8a\u591a\u8d8a\u5927\uff0c\u5360\u7528\u7684\u7a7a\u95f4\u4e5f\u8d8a\u5927\uff0c\u4ece\u7528\u6237\u7684\u73af\u5883\u6765\u8bf4\u8fd9\u4e5f\u4e0d\u662f\u95ee\u9898\uff0c\u4f46\u5982\u679c\u4e00\u4e2a\u8868\u6709\u8fc7\u591a\u8fc7\u5927\u7684\u67e5\u8be2\uff0c\u5fc5\u7136\u4f1a\u5f71\u54cdinsert\u3001delete\u548cupdate\u7d22\u5f15\u5217\u7684\u901f\u5ea6\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u64cd\u4f5c\u6539\u53d8\u4e86\u6574\u4e2a\u8868\u7684\u7d22\u5f15\u987a\u5e8f\uff0coracle\u9700\u8981\u8fdb\u884c\u8c03\u6574\uff0c\u8fd9\u6837\u6027\u80fd\u5c31\u4e0b\u964d\u4e86\u3002\u56e0\u6b64\u6211\u4eec\u4e00\u5b9a\u8981\u5408\u7406\u7684\u5efa\u7acb\u597d\u6709\u6548\u7684\u7d22\u5f15\uff0c\u7f16\u7a0b\u4e5f\u8981\u7b26\u5408\u7d22\u5f15\u7684\u89c4\u5219\uff0c\u800c\u4e0d\u80fd\u662f\u7d22\u5f15\u7b26\u5408\u7f16\u7a0b\u7684\u89c4\u5219\u3002<\/p>\n<p>\u6848\u4f8b\uff1a<\/p>\n<p>\u67d0\u9879\u76ee\u6570\u636e\u8f6c\u6362\uff0c\u91c7\u7528\u6e38\u6807\u5faa\u73afinsert\u7684\u65b9\u5f0f\uff0c\u603b\u51712000\u4e07\u7684\u6570\u636e\uff0c\u603b\u5171\u7528\u4e864\u4e2a\u5c0f\u65f6\uff0c\u539f\u56e0\u5c31\u662f\u76ee\u6807\u8868\u91cc\u9762\u6709\u5f88\u591a\u7d22\u5f15\u3002\u89e3\u51b3\u65b9\u6cd5\u662f\u5148\u5220\u9664\u7d22\u5f15\u518d\u6267\u884c\u8f6c\u6362\u811a\u672c\uff0c\u7ed3\u679c\u4e0d\u75281\u5c0f\u65f6\u5c31\u5b8c\u6210\u4e86\uff0c\u5efa\u7acb\u5168\u90e8\u7684\u7d22\u5f15\u4e0d\u5230\u534a\u4e2a\u5c0f\u65f6\u3002<\/p>\n<p>\u539f\u56e0\u5c31\u662f\u7b2c\u4e00\u79cd\u65b9\u5f0f\u6bcf\u6b21insert\u90fd\u6539\u53d8\u7d22\u5f15\u987a\u5e8f\uff0c\u5171\u6267\u884c\u6539\u53d82000\u4e07\u6b21\uff0c\u800c\u7b2c\u4e8c\u79cd\u65b9\u5f0f\u6574\u4f53\u4e0a\u6267\u884c\u7d22\u5f15\u987a\u5e8f\u5c31\u4e00\u6b21\u3002<\/p>\n<h1><a id=\"post-6566-_Toc205891237\"><\/a>PLSQL\u7a0b\u5e8f\u6027\u80fd\u95ee\u9898\u5206\u6790\u65b9\u6cd5<\/h1>\n<p>\u672c\u7ae0\u4e3b\u8981\u4ecb\u7ecd\u600e\u6837\u627e\u5230\u51fa\u73b0\u6027\u80fd\u95ee\u9898PLSQL\u7a0b\u5e8f\u6216\u8bed\u53e5\u7684\u65b9\u6cd5\u3002<\/p>\n<h2><a id=\"post-6566-_Toc205891238\"><\/a>\u6027\u80fd\u95ee\u9898\u5206\u6790<\/h2>\n<p><strong>\u51fa\u73b0\u6027\u80fd\u95ee\u9898\uff0c\u6211\u5148\u8981\u4ece\u6574\u4f53\u8fdb\u884c\u5206\u6790\uff0c\u4e00\u822c\u603b\u4f53\u4e0a\u4f1a\u6709\u51e0\u79cd\u73b0\u8c61\uff1a<\/strong><\/p>\n<ul>\n<li>\u6574\u4e2a\u7cfb\u7edf\u8fd0\u884c\u901f\u5ea6\u90fd\u6162\n<ul>\n<li>\u5728\u4e1a\u52a1\u4e0d\u5fd9\u7684\u65f6\u5019\uff0c\u6240\u6709\u6a21\u5757\u90fd\u6162<\/li>\n<li>\u53ea\u6709\u5728\u4e1a\u52a1\u7e41\u5fd9\u7684\u65f6\u5019\uff0c\u6240\u6709\u6a21\u5757\u90fd\u6162<\/li>\n<li>\u65f6\u5feb\u65f6\u6162<\/li>\n<\/ul>\n<\/li>\n<li>\u4e2a\u522b\u4e1a\u52a1\u6a21\u5757\u8fd0\u884c\u901f\u5ea6\u6162\n<ul>\n<li>\u5728\u4e1a\u52a1\u4e0d\u5fd9\u7684\u65f6\u5019\uff0c\u8be5\u6a21\u5757\u5c31\u6162<\/li>\n<li>\u53ea\u6709\u5728\u4e1a\u52a1\u7e41\u5fd9\u7684\u65f6\u5019\uff0c\u8be5\u6a21\u5757\u624d\u6162<\/li>\n<li>\u65f6\u5feb\u65f6\u6162<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u4e00\u822c\u5bfc\u81f4\u7cfb\u7edf\u6027\u80fd\u6162\u7684\u56e0\u7d20\uff1a<\/p>\n<ul>\n<li>\u786c\u4ef6\uff1a\u5ba2\u6237\u7aef\u3001\u670d\u52a1\u5668CPU\u3001\u5185\u5b58\u548c\u5b58\u50a8\u8bbe\u5907\u914d\u7f6e\u4e0d\u7b26\u5408\u5e94\u7528\u7cfb\u7edf\u8981\u6c42<\/li>\n<li>\u7f51\u7edc\uff1a\u7f51\u901f\u4f4e\u3001\u4e22\u5305<\/li>\n<li>\u64cd\u4f5c\u7cfb\u7edf\u53c2\u6570\u8bbe\u7f6e\uff1a\u53c2\u6570\u8bbe\u7f6e\u4e0d\u5408\u7406<\/li>\n<li>\u53d7\u5230\u5176\u4ed6\u8f6f\u4ef6\u5e72\u6270\uff1a\u4f8b\u5982\uff1a\u9632\u706b\u5899\u3001\u75c5\u6bd2<\/li>\n<li>Weblogic\u8bbe\u7f6e\uff1a\u53c2\u6570\u8bbe\u7f6e\u4e0d\u5408\u7406<\/li>\n<li>Oracle\u8bbe\u7f6e\uff1a\u5185\u5b58\u3001\u8868\u7a7a\u95f4\u3001redolog\u3001\u7cfb\u7edf\u53c2\u6570\u8bbe\u7f6e\u4e0d\u5408\u7406\u7b49<\/li>\n<li>PLSQL\u7a0b\u5e8f\uff1aplsql\u4e0d\u4f18\u5316\u3001\u672a\u4f7f\u7528\u7d22\u5f15\u3001\u9501\u8868<\/li>\n<\/ul>\n<p><strong>\u5728\u4e0d\u540c\u73b0\u8c61\u4e0b\uff0c\u53ef\u80fd\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u7684\u56e0\u7d20\uff1a<\/strong><\/p>\n<ol>\n<li>\u4e00\u822c\u6765\u8bf4\uff0c\u5982\u679c\u5728\u4e0d\u529e\u7406\u4e1a\u52a1\u7684\u60c5\u51b5\u4e0b\uff0c\u6574\u4e2a\u7cfb\u7edf\u6027\u80fd\u5c31\u6162\u7684\u8bdd\uff0c\u5e94\u8be5\u548cPLSQL\u7a0b\u5e8f\u4f18\u5316\u662f\u6ca1\u6709\u5173\u7cfb\u7684\u3002\u53ef\u80fd\u7684\u56e0\u7d20\u4e3a\u786c\u4ef6\u3001\u7f51\u7edc\u3001\u64cd\u4f5c\u7cfb\u7edf\u3001\u5176\u4ed6\u8f6f\u4ef6\u5e72\u6270\u3001ORACLE\u8bbe\u7f6e\u3002<\/li>\n<li>\u53ea\u6709\u5728\u4e1a\u52a1\u7e41\u5fd9\u7684\u65f6\u5019\uff0c\u6574\u4f53\u7cfb\u7edf\u6027\u80fd\u90fd\u6162\uff0c\u6709\u53ef\u80fd\u7684\u56e0\u7d20\u6709\u786c\u4ef6\u3001\u64cd\u4f5c\u7cfb\u7edf\u8bbe\u7f6e\u3001WEBLOGIC\u8bbe\u7f6e\u3001ORACLE\u8bbe\u7f6e\u3001PLSQL\u7a0b\u5e8f\u3002\u5982\u679c\u5728sqlplus\u4e0b\u505a\u67e5\u8be2\u90fd\u6162\uff0c\u90a3\u4e48\u5c31\u548cweblogic\u6ca1\u6709\u5173\u7cfb\u3002<\/li>\n<li>\u4e00\u822c\u6765\u8bf4\uff0c\u5982\u679c\u5728\u4e0d\u529e\u7406\u4e1a\u52a1\u7684\u60c5\u51b5\u4e0b\uff0c\u4e2a\u522b\u4e1a\u52a1\u6a21\u5757\u901f\u5ea6\u5c31\u6162\u7684\u8bdd\uff0c\u90a3\u4e48\u57fa\u672c\u4e0a\u5c31\u662fPLSQL\u7a0b\u5e8f\u4e0d\u4f18\u5316\u6216\u672a\u4f7f\u7528\u7d22\u5f15\u9020\u6210\u7684\u3002<\/li>\n<li>\u53ea\u6709\u5728\u4e1a\u52a1\u7e41\u5fd9\u7684\u65f6\u5019\uff0c\u4e2a\u522b\u6a21\u5757\u6162\uff0c\u6709\u53ef\u80fd\u7684\u56e0\u7d20\u6709\u786c\u4ef6\u3001\u64cd\u4f5c\u7cfb\u7edf\u8bbe\u7f6e\u3001WEBLOGIC\u8bbe\u7f6e\u3001ORACLE\u8bbe\u7f6e\u3001PLSQL\u7a0b\u5e8f\u3001\u9501\u8868\u3002<\/li>\n<\/ol>\n<p>\u8fd9\u91cc\u6211\u4eec\u91cd\u70b9\u662f\u8bf4\u660ePLSQL\u4f18\u5316\u3001\u7d22\u5f15\u4f18\u5316\u7684\u95ee\u9898\uff0c\u5176\u4ed6\u4f8b\u5982\uff1a\u786c\u4ef6\u3001\u7f51\u7edc\u3001\u64cd\u4f5c\u7cfb\u7edf\u548coracle\u8bbe\u7f6e\u7b49\u56e0\u7d20\u6211\u4eec\u4e0d\u8fdb\u884c\u8bf4\u660e\u3002<\/p>\n<p><strong>PLSQL\u4f18\u5316\u3001\u7d22\u5f15\u4e0d\u4f7f\u7528\u7684\u95ee\u9898\u4ea7\u751f\u7684\u5f71\u54cd\uff1a<\/strong><\/p>\n<ol>\n<li>\u5bf9\u4e8e\u67d0\u6bb5\u4e0d\u4f18\u5316\u7684\u7a0b\u5e8f\u6216\u8bed\u53e5\u9891\u7e41\u6216\u8005\u5168\u8868\u626b\u63cf\u4e00\u4e2a\u8868\u65f6\uff0c\u5b83\u8bbf\u95ee\u78c1\u76d8\u7684\u65f6\u95f4\u548c\u5360\u7528\u7684\u541e\u5410\u91cf\u662f\u5f88\u9ad8\u7684\uff0c\u8fd9\u5c31\u5bfc\u81f4\u7cfb\u7edfIO\u957f\u65f6\u95f4\u5904\u4e8e\u5fd9\u7684\u72b6\u6001\uff0c\u5bfc\u81f4\u6574\u4e2a\u7cfb\u7edf\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n<li>\u5bf9\u4e8e\u67d0\u6bb5\u4e0d\u4f18\u5316\u7684\u7a0b\u5e8f\u6216\u8bed\u53e5\u9891\u7e41\u6216\u8005\u5168\u8868\u626b\u63cf\u4e00\u4e2a\u8868\u65f6\uff0c\u5176\u4ed6\u7684\u4e1a\u52a1\u7a0b\u5e8f\u4e5f\u8bbf\u95ee\u540c\u4e00\u4e2a\u8868\u65f6\uff0c\u901f\u5ea6\u5c06\u5927\u5927\u4e0b\u964d\u3002<\/li>\n<li>\u5982\u679c\u662f\u66f4\u65b0\u8868\u64cd\u4f5c\u65f6\u95f4\u957f\uff0c\u8fd8\u53ef\u80fd\u4f1a\u5bfc\u81f4\u9501\u7b49\u5f85\uff0c\u5bfc\u81f4\u4f1a\u8bdd\u5835\u585e\uff0cweblogic\u7aef\u4e5f\u51fa\u73b0\u538b\u529b\u95ee\u9898\uff0c\u5bfc\u81f4\u8fd9\u4e2a\u7cfb\u7edf\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n<\/ol>\n<p>\u6211\u4eec\u4e00\u822c\u6839\u636e\u8fd9\u4e9b\u73b0\u8c61\u3001\u4ee5\u53ca\u4e00\u4e9b\u65b9\u6cd5\u5224\u65ad\uff0c\u6765\u521d\u6b65\u5206\u6790\u4ea7\u751f\u6027\u80fd\u95ee\u9898\u7684\u5927\u81f4\u539f\u56e0\u7684\u8303\u56f4\u3002\u4e0d\u8fc7\u5bf9\u4e8e\u8fd9\u4e00\u70b9\uff0c\u8fd8\u662f\u6bd4\u8f83\u56f0\u96be\u7684\uff0c\u56e0\u4e3a\u4ea7\u751f\u95ee\u9898\u7684\u539f\u56e0\u662f\u591a\u79cd\u7684\uff0c\u5e76\u4e14\u8fd8\u6709\u4e00\u5b9a\u7684\u5173\u8054\u3002\u4e0b\u9762\u7684\u7ae0\u8282\u4ecb\u7ecd\u6211\u4eec\u5df2\u7ecf\u65ad\u5b9a\u662fPLSQL\u4f18\u5316\u3001\u7d22\u5f15\u4e0d\u4f7f\u7528\u7684\u95ee\u9898\uff0c\u6211\u4eec\u901a\u8fc7\u4ec0\u4e48\u65b9\u6cd5\u6765\u5177\u4f53\u5b9a\u4f4d\u95ee\u9898\u3002<\/p>\n<h2><a id=\"post-6566-_Toc205891239\"><\/a>Expain Plan\u5206\u6790\u7d22\u5f15\u4f7f\u7528<\/h2>\n<p>\u5728PL\/SQL Developer\u7b49\u5de5\u5177\u6709\u4e00\u4e2aExpain Plan\u5206\u6790\u7684\u529f\u80fd\uff0c\u8fd9\u4e2a\u529f\u80fd\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5206\u6790SQL\u8bed\u53e5\u662f\u5426\u4f7f\u7528\u4e86\u7d22\u5f15\u3001\u4f7f\u7528\u54ea\u4e9b\u7d22\u5f15\u548c\u4f7f\u7528\u7d22\u5f15\u7684\u6548\u679c\u3002<\/p>\n<ol>\n<li>\u9009\u62e9explain plan\u7684\u7a97\u53e3<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"142\" height=\"390\" class=\"wp-image-6567\" src=\"http:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-165.png\" \/><\/p>\n<ol>\n<li>\u5728\u4e0a\u9762\u680f\u4e2d\u8f93\u5165SQL\u8bed\u53e5\uff0c\u7136\u540e\u70b9\u51fb\u5de5\u5177\u680f\u4e0a\u7684EXECUTE\u6267\u884c\uff08\u6216\u6309F8\uff09\uff0c\u5c31\u4f1a\u5728\u4e0b\u9762\u663e\u793aOptmizergoal\u4f18\u5316\u5668\u7684\u9ed8\u8ba4\u65b9\u5f0f\uff08\u4e5f\u53ef\u624b\u5de5\u9009\u62e9\uff09\uff0c\u4ee5\u53ca\u4e0b\u9762\u7684\u89e3\u91ca\u8ba1\u5212\uff0c\u4ece\u89e3\u91ca\u8ba1\u5212\u4e0a\u80fd\u770b\u5230\u54ea\u4e2a\u6761\u4ef6\u8bed\u53e5\u4f7f\u7528\u4e86\u7d22\u5f15\uff0c\u54ea\u4e2a\u6ca1\u6709\u4f7f\u7528\uff1b\u54ea\u4e2a\u8868\u4f7f\u7528\u4e86\u7d22\u5f15\uff0c\u4f7f\u7528\u4e86\u54ea\u4e2a\u7d22\u5f15\uff0c\u54ea\u4e9b\u8868\u662f\u5168\u8868\u626b\u63cf\u7684(TABLE ACCESS FULL)<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"742\" class=\"wp-image-6568\" src=\"http:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-166.png\" srcset=\"https:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-166.png 1024w, https:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-166-768x557.png 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<ol>\n<li>\u5206\u6790\u5185\u5bb9\u8bf4\u660e\uff1a\n<ul>\n<li>COST\uff1a\u6839\u636e\u4f18\u5316\u7a0b\u5e8f\u7684\u57fa\u4e8e\u5f00\u9500\u7684\u65b9\u6cd5\u6240\u4f30\u8ba1\u51fa\u7684\u64cd\u4f5c\u5f00\u9500\u503c\u5bf9\u4e8e\u4f7f\u7528\u57fa\u4e8e\u89c4\u5219\u65b9\u6cd5\u7684\u8bed\u53e5\u8be5\u5217\u4e3a\u7a7a\u8be5\u5217\u503c\u6ca1\u6709\u7279\u5b9a\u7684\u6d4b\u91cf\u5355\u4f4d\u5b83\u53ea\u662f\u4e00\u4e2a\u7528\u4e8e\u6bd4\u8f83\u6267\u884c\u89c4\u5212\u5f00\u9500\u5927\u5c0f\u7684\u6743\u91cd\u503c<\/li>\n<li>Cardinality\uff1a\u6839\u636e\u57fa\u4e8e\u5f00\u9500\u7684\u65b9\u6cd5\u5bf9\u64cd\u4f5c\u6240\u8bbf\u95ee\u884c\u6570\u7684\u4f30\u8ba1\u503c<\/li>\n<li>Bytes\uff1a\u6839\u636e\u57fa\u4e8e\u5f00\u9500\u7684\u65b9\u6cd5\u5bf9\u64cd\u4f5c\u6240\u8bbf\u95ee\u5b57\u8282\u7684\u4f30\u8ba1<\/li>\n<li>\u901a\u8fc7\u8bbe\u7f6e\uff0c\u6211\u4eec\u8fd8\u80fd\u770b\u5230\u66f4\u591a\u7684\u4fe1\u606f\uff0c\u4f8b\u5982\uff1aCPU\u4f7f\u7528\u3001\u65f6\u95f4\u7b49\u7b49<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p>\u5168\u8868\u626b\u63cf\u7684(TABLE ACCESS FULL)\u80af\u5b9a\u662f\u901f\u5ea6\u6162\u7684\uff0c\u5982\u679c\u662f\u5927\u6570\u636e\u91cf\u7684\u8868\uff0c\u90a3\u4e48\u8fd9\u4e2a\u8bed\u53e5\u662f\u7edd\u5bf9\u5f71\u54cd\u6027\u80fd\u7684\u3002<\/p>\n<p>\u53e6\u5916\u4f7f\u7528\u4e86\u7d22\u5f15\u4e5f\u4e0d\u4e00\u5b9a\u6027\u80fd\u5c31\u9ad8\uff0c\u56e0\u4e3a\u7d22\u5f15\u4f7f\u7528\u4e5f\u6709\u6548\u7387\u7684\u60c5\u51b5\uff0c\u4e0b\u9762\u5217\u51fa\u7d22\u5f15\u5e38\u89c1\u7684\u4f7f\u7528\u7c7b\u578b\uff1a<\/p>\n<ol>\n<li>INDEX UNIQUE SCAN\uff1a\u552f\u4e00\u7d22\u5f15\u626b\u63cf\uff0c\u901f\u5ea6\u6700\u5feb<\/li>\n<li>INDEX RANGE SCAN\uff1a\u8303\u56f4\u7d22\u5f15\u626b\u63cf\uff0c\u4f7f\u7528\u8fd9\u4e2a\u7d22\u5f15\u65f6\uff0c\u5c31\u9700\u8981\u770bCOST\u3001Cardinality\u3001Bytes\u7684\u5927\u5c0f\u4e86\uff0c\u5982\u679c\u7279\u522b\u5927\uff0c\u6709\u65f6\u5019\u8fd8\u53ef\u80fd\u901f\u5ea6\u4f4e\u4e8e\u5168\u8868\u626b\u63cf\u7684\u901f\u5ea6\u3002<\/li>\n<\/ol>\n<p>\u6211\u4eec\u5728\u77e5\u9053\u8bed\u53e5\u6709\u95ee\u9898\uff0c\u6216\u8005\u6211\u4eec\u5bf9\u8bed\u53e5\u8fdb\u884c\u4f18\u5316\u65f6\uff0c\u8fd9\u4e2a\u5de5\u5177\u662f\u975e\u5e38\u6709\u7528\u7684\u3002<\/p>\n<h2><a id=\"post-6566-_Toc205891240\"><\/a>TOPSQL\u5206\u6790<\/h2>\n<p>\u7a0b\u5e8f\u6709\u6027\u80fd\u95ee\u9898\u7684\u65f6\u5019\uff0c\u6211\u4eec\u662f\u4e0d\u77e5\u9053\u54ea\u4e9b\u8bed\u53e5\u5b58\u5728\u6027\u80fd\u7684\u95ee\u9898\uff0c\u5c24\u5176\u4f60\u4e0d\u662f\u5f00\u53d1\u4eba\u5458\u3002\u5e78\u597d\u6709\u4e00\u4e9b\u5de5\u5177\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u627e\u5230\u8fd9\u4e9b\u5b58\u5728\u6027\u80fd\u95ee\u9898\u7684\u8bed\u53e5\u3002<\/p>\n<p>Toad\u5de5\u5177\u548cORACLE9I\u7684\u4f01\u4e1a\u7ba1\u7406\u63a7\u5236\u53f0\u5de5\u5177\u53ef\u4ee5\u6355\u83b7\u5230\u8fd9\u4e9b\u95ee\u9898\u8bed\u53e5\uff08oracle10g\u4e2dem\u7684\u529f\u80fd\u4e0d\u591f\u597d\uff09\u3002\u5728TOAD\u548cORACLE9I\u5de5\u5177\u4e2d\u53ef\u4ee5\u67e5\u8be2\u5230TOPSQL\u9876\u7ea7SQL\u7684\u5185\u5bb9\uff0c\u901a\u8fc7CPU\u3001IO\u541e\u5410\u91cf\u3001\u5360\u7528\u65f6\u95f4\u7b49\u4fe1\u606f\u7684\u6392\u5e8f\uff0c\u6211\u4eec\u53ef\u4ee5\u627e\u5230\u6700\u5f71\u54cd\u7cfb\u7edf\u6027\u80fd\u7684\u8bed\u53e5\uff0c\u901a\u8fc7\u5206\u6790\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u8fd9\u4e9b\u8bed\u53e5\u7684\u89e3\u91ca\u8ba1\u5212\u3002<\/p>\n<p>\u6839\u636e\u89e3\u91ca\u8ba1\u5212\uff0c\u6211\u4eec\u53ef\u4ee5\u8fdb\u884c\u8bed\u53e5\u7684\u4f18\u5316\uff0c\u6211\u4eec\u77e5\u9053\u8bed\u53e5\u540e\uff0c\u6211\u4eec\u901a\u8fc7plsql\u7684\u641c\u7d22\u529f\u80fd\u5c31\u77e5\u9053\u5b58\u5728\u95ee\u9898\u8bed\u53e5\u7684\u7a0b\u5e8f\u4e86\u3002<\/p>\n<p>\u8fd9\u4e2a\u529e\u6cd5\u4f7f\u7528\u6709\u4e2a\u524d\u63d0\u6761\u4ef6\u5c31\u662f\u8fd9\u4e9b\u95ee\u9898\u8bed\u53e5\u5728\u7cfb\u7edf\u4e0a\u8fd0\u884c\u8fc7\uff0c\u5e76\u4e14\u6ca1\u6709\u95f4\u9694\u8fc7\u957f\u7684\u65f6\u95f4\uff0c\u56e0\u6b64\u6700\u597d\u662f\u5728\u5b9e\u9645\u51fa\u73b0\u6027\u80fd\u95ee\u9898\u7684ORACLE\u4e0a\u4e0d\u65ad\u7684\u53bb\u76d1\u63a7\uff0c\u624d\u80fd\u6355\u83b7\u5230\u6700\u5168\u7684\u95ee\u9898\u8bed\u53e5\u3002<\/p>\n<ol>\n<li>ORACLE9i\u4f01\u4e1a\u7ba1\u7406\u63a7\u5236\u53f0\u5de5\u5177\u7684topsql<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"742\" class=\"wp-image-6569\" src=\"http:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-167.png\" srcset=\"https:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-167.png 1024w, https:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-167-768x557.png 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<ol>\n<li>\u7cfb\u7edf\u8fd0\u884c\u4e2d\u7684\u6240\u6709TOPSQL<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"742\" class=\"wp-image-6570\" src=\"http:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-168.png\" srcset=\"https:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-168.png 1024w, https:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-168-768x557.png 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<ol>\n<li>\u5206\u6790\u5177\u4f53\u7684SQL\u8bed\u53e5<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" class=\"wp-image-6571\" src=\"http:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-169.png\" srcset=\"https:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-169.png 1024w, https:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-169-768x576.png 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<ol>\n<li>Sql\u5206\u6790\u7684\u89e3\u91ca\u8ba1\u5212<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" class=\"wp-image-6572\" src=\"http:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-170.png\" \/><\/p>\n<h2><a id=\"post-6566-_Toc205891241\"><\/a>\u9488\u5bf9\u6027\u8bed\u53e5\u641c\u7d22<\/h2>\n<p>TOPSQL\u5206\u6790\u4e5f\u53ea\u80fd\u662f\u627e\u5230\u672a\u4f7f\u7528\u7d22\u5f15\u7684\u8bed\u53e5\uff08\u5b9e\u9645\u4e0a\u8fd9\u4e00\u70b9\u57fa\u672c\u5c31\u8db3\u591f\u89e3\u51b3\u6027\u80fd\u7684\u95ee\u9898\u4e86\uff09\uff0c\u4f46\u662f\u5bf9\u4e8e2.4\u7ae0\u8282\u4e2d\u7684\u5f88\u591a\u5185\u5bb9\uff0c\u6ca1\u6709\u529e\u6cd5\u8fdb\u884c\u6355\u83b7\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u91c7\u7528\u9488\u5bf9\u6027\u8bed\u53e5\u641c\u7d22\uff0c\u6765\u5c3d\u91cf\u627e\u5230\u4e00\u4e9b\u95ee\u9898\u8bed\u53e5\u8fdb\u884c\u4f18\u5316\u3002\u5728PLSQL\u5de5\u5177\u4e2d\u6709\u4e00\u4e2aFind DB Object\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u8fdb\u884c\u641c\u7d22\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"742\" class=\"wp-image-6573\" src=\"http:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-171.png\" srcset=\"https:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-171.png 1024w, https:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-171-768x557.png 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u641c\u7d22\u7684\u5173\u952e\u7279\u5f81\u4fe1\u606f\uff1a<\/p>\n<ul>\n<li>NOT IN<\/li>\n<li>UNION<\/li>\n<li>GROUP BY<\/li>\n<li>ORDER BY<\/li>\n<li>&gt; \u3001 &lt; \u3001&lt;&gt;<\/li>\n<li>Like \u2018%<\/li>\n<li>From tab \u3001Update tab\u3001delete tab\uff0c\u5176\u4e2dtab\u662f\u6570\u636e\u91cf\u7279\u522b\u5927\u7684\u8868\uff0c\u6211\u4eec\u53ef\u4ee5\u9488\u5bf9\u6027\u7684\u68c0\u67e5\u5bf9\u5927\u8868\u8bbf\u95ee\u7684\u8bed\u53e5\uff08\u4f8b\u5982\uff1aac20\u3001ab09\u3001kc22\u3001kc24\u7b49\uff09\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u79cd\u529e\u6cd5\u5f88\u6709\u5c40\u9650\u6027\uff0c\u4e0d\u8fc7\u4e5f\u662f\u4e00\u79cd\u68c0\u67e5\u4ee3\u7801\u7684\u529e\u6cd5\u3002<\/p>\n<h2><a id=\"post-6566-_Toc205891242\"><\/a>\u540e\u53f0\u5b58\u50a8\u8fc7\u7a0b\u8ddf\u8e2a<\/h2>\n<p>\u4ee5\u4e0a\u7684\u5404\u79cd\u529e\u6cd5\uff0c\u57fa\u672c\u90fd\u4e0d\u80fd\u68c0\u67e5\u51fa\u7c7b\u4f3c2.4.8\u548c2.4.9\u7b49\u95ee\u9898\uff0c\u5f53\u6211\u4eec\u4e0d\u80fd\u901a\u8fc7\u6574\u4f53\u4e0a\u53bb\u53d1\u73b0\u95ee\u9898\u7684\u65f6\u5019\uff0c\u6211\u4eec\u5bf9\u6709\u6027\u80fd\u95ee\u9898\u7a0b\u5e8f\u76f4\u63a5\u8fdb\u884c\u540e\u53f0\u7684\u8ddf\u8e2a\uff0c\u6709\u65f6\u5019\u5f80\u5f80\u662f\u6700\u6709\u6548\u7684\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"742\" class=\"wp-image-6574\" src=\"http:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-172.png\" srcset=\"https:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-172.png 1024w, https:\/\/www.hefeiyu.com\/wp-content\/uploads\/2019\/09\/word-image-172-768x557.png 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<h2><a id=\"post-6566-_Toc205891243\"><\/a>\u6027\u80fd\u76d1\u63a7<\/h2>\n<p>\u7528\u6237\u7684\u751f\u4ea7\u8fd0\u884c\u73af\u5883\uff0c\u6570\u636e\u5e93\u4e00\u822c\u90fd\u662fUNIX\u7cfb\u7edf\u7684\u5c0f\u673a\u3002\u6211\u4eec\u4f1a\u5728\u64cd\u4f5c\u7cfb\u7edf\u7ea7\u4e0a\u8fdb\u884c\u76d1\u63a7\u548cORACLE\u7684session\u4e0a\u8fdb\u884c\u76d1\u63a7\u3002<\/p>\n<p><strong>UNIX\u4e0b\u76d1\u63a7\u6027\u80fd\u7684\u547d\u4ee4\uff1a<\/strong><\/p>\n<ol>\n<li>topas\u53ef\u4ee5\u89c2\u5bdfCPU\u3001\u5185\u5b58\u3001IO\u7684\u4f7f\u7528\uff0c\u4e0d\u8fc7\u8be5\u547d\u4ee4\u4e0d\u662f\u6240\u6709\u7684UNIX\u90fd\u901a\u7528<\/li>\n<li>vmstat\u53ef\u4ee5\u89c2\u5bdfCPU\u548c\u5185\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\u3002\u4f8b\u5982\uff1avmstat 1<\/li>\n<li>iostat\u53ef\u4ee5\u89c2\u5bdfIO\u7684\u4f7f\u7528\u60c5\u51b5\u3002\u4f8b\u5982\uff1aiostat 1<\/li>\n<li>ps aux | head -25\u67e5\u770bcpu\u5360\u7528\u6700<a id=\"post-6566-baidusnap4\"><\/a>\u9ad8\u7684\u8fdb\u7a0b<\/li>\n<li>\u67e5\u8be2\u5185\u5b58\u4f7f\u7528\u6700\u9ad8\u7684\u8fdb\u884c\u547d\u4ee4\uff1atop<\/li>\n<li>\u67e5\u770boracle\u8fdb\u7a0b\u547d\u4ee4\uff1aps \u2013ef|grep oracle<\/li>\n<li>\u901a\u8fc7ps\u627e\u5230\u8fdb\u7a0b\u7684pid\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u6267\u884c\u4e0b\u9762\u7684\u8bed\u53e5\u67e5\u770b\u8fdb\u7a0b\u5177\u4f53\u8fd0\u884c\u7684SQL\u8bed\u53e5\u7684\u6587\u672c\uff1a<br \/>\nSELECT \/*+ ORDERED *\/ sql_text FROM v$sqltext a<br \/>\nWHERE (a.hash_value, a.address) IN (<br \/>\nSELECT DECODE (sql_hash_value,0, prev_hash_value,sql_hash_value),<br \/>\nDECODE (sql_hash_value,0, prev_sql_addr, sql_address)<br \/>\nFROM v$session b<br \/>\nWHERE b.paddr = (SELECT addr<br \/>\nFROM v$process c<br \/>\nWHERE c.spid = &#8216;&amp;pid&#8217;))<br \/>\nORDER BY piece ASC<\/li>\n<\/ol>\n<h1><a id=\"post-6566-_Toc205891244\"><\/a>\u6027\u80fd\u6d4b\u8bd5\u5de5\u5177\u8bbe\u8ba1\u601d\u60f3<\/h1>\n<h2>\u5f00\u53d1\u5de5\u5177\u7684\u76ee\u7684<\/h2>\n<p>\u73b0\u5728\u6240\u6709\u89e3\u51b3\u7a0b\u5e8f\u4e0a\u7684\u6027\u80fd\u95ee\u9898\u7684\u529e\u6cd5\uff0c\u5927\u90e8\u5206\u90fd\u662f\u5728\u7cfb\u7edf\u8fd0\u884c\u540e\u7684\u89e3\u51b3\u529e\u6cd5\uff0c\u6211\u4eec\u60f3\u5236\u4f5c\u4e00\u4e2a\u5de5\u5177\uff0c\u8be5\u5de5\u5177\u5728\u5f00\u53d1\u9636\u6bb5\u548c\u6d4b\u8bd5\u9636\u6bb5\u5c31\u53ef\u4ee5\u76f4\u63a5\u627e\u5230\u5b58\u5728\u95ee\u9898\u7684\u7a0b\u5e8f\u8bed\u53e5\u3002\u8fd9\u6837\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u7a0b\u5e8f\u4e0a\u7684\u98ce\u9669\uff0c\u4e5f\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u68c0\u67e5\u548c\u6027\u80fd\u6d4b\u8bd5\u7684\u5de5\u4f5c\u91cf\u3002<\/p>\n<h2>\u603b\u4f53\u8bbe\u8ba1\u601d\u60f3<\/h2>\n<p>\u5bf9\u540e\u53f0\u5b58\u50a8\u8fc7\u7a0b\u7684\u7a0b\u5e8f\u6587\u4ef6\u8fdb\u884c\u904d\u5386\u626b\u63cf\uff0c\u5bf9SQL\u8bed\u53e5\u8fdb\u884c\u68c0\u67e5\u3002<\/p>\n<p>\u5b9e\u73b0\u7684\u529f\u80fd\uff1a<\/p>\n<ol>\n<li>\u68c0\u67e5\u7a0b\u5e8f\u4e2d\u7684SQL\u8bed\u53e5\u662f\u5426\u4f7f\u7528\u7d22\u5f15<\/li>\n<li>\u67e5\u8be2\u5177\u6709\u7279\u5f81\u7684\u5173\u952e\u5b57\u7684SQL\u8bed\u53e5\u3002\u4f8b\u5982\uff1aNOT IN<\/li>\n<li>\u68c0\u67e5\u6e38\u6807\u4e2d\u5d4c\u5165\u6e38\u6807\u6216\u67e5\u8be2\u7684\u8bed\u53e5<\/li>\n<li>\u68c0\u67e5\u5217\u4e0a\u4f7f\u7528\u4e86\u51fd\u6570\u3001\u8fd0\u7b97\u7684\u8bed\u53e5<\/li>\n<li>\u68c0\u67e5\u8d85\u8fc73\u4e2a\u8868\u4ee5\u4e0a\u7684\u5173\u8054\u8bed\u53e5<\/li>\n<li>\u68c0\u67e5\u540c\u4e00\u4e2a\u8868\u591a\u6b21\u8bbf\u95ee\uff08\u4e0d\u5bb9\u6613\u5b9e\u73b0\uff09<\/li>\n<\/ol>\n<h3>\u8bfb\u53d6\u6587\u4ef6<\/h3>\n<p>\u9010\u884c\u8fdb\u884c\u8bfb\u53d6<\/p>\n<h3>\u6355\u83b7SQL\u8bed\u53e5<\/h3>\n<p>\u9047\u5230SQL\u5173\u952e\u5b57\u5f00\u59cb\u8bb0\u5f55\uff0c\u76f4\u5230\u9047\u5230\u201c\uff1b\u201d\u4e3a\u6b62<\/p>\n<p>\u5efa\u7acb\u5206\u6790\u8868\u505a\u4fdd\u5b58<\/p>\n<p>\u8bb0\u5f55\u5305\u4f53\u540d\u3001\u8fc7\u7a0b\u540d\u3001\u7b80\u7565SQL\u3001\u8be6\u7ec6SQL\u3001\u662f\u5426\u5faa\u73af\u4e2d<\/p>\n<p>\u7b80\u7565SQL\uff1a<\/p>\n<ul>\n<li>SQL\u53bb\u6389\u56de\u8f66\u6362\u884c<\/li>\n<li>\u622a\u53d6\u524d100\u4e2a\u5b57\u7b26<\/li>\n<\/ul>\n<h3>SQL\u8bed\u53e5\u5206\u6790<\/h3>\n<h3>\u8bbe\u7f6e\u5173\u952e\u5b57<\/h3>\n<p>\u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1a<a href=\"https:\/\/www.hefeiyu.com\">\u8d6b\u975e\u57df<\/a> &raquo; <a href=\"https:\/\/www.hefeiyu.com\/?p=6566\">PLSQL\u7a0b\u5e8f\u4f18\u5316\u548c\u6027\u80fd\u5206\u6790\u65b9\u6cd5<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>&nbsp; \u524d\u8a00 \u76ee\u7684 \u6027\u80fd\u6d4b\u8bd5\u662f\u6d4b\u8bd5\u4e2d\u6bd4\u8f83\u91cd\u8981\u7684\u5de5\u4f5c\uff0c\u6027\u80fd\u6d4b\u8bd5\u5e94\u5206\u4e3a\u538b\u529b\u7684\u6d4b\u8bd5\u548c\u6027\u80fd\u7684\u6d4b\u8bd5\uff0c\u5176\u4e2d\u6027\u80fd\u95ee\u9898\u4e2d\u7edd\u5927\u90e8\u5206\u90fd\u662f\u7531\u4e8e\u7a0b\u5e8f\u7f16\u5199\u7684\u4e0d\u5408\u7406\u3001\u4e0d\u89c4\u8303\u9020\u6210\u7684\u3002\u672c\u6587\u6863\u8bf4\u660e\u4e86\u7a0b\u5e8f\u4e2d\u5e38\u89c1\u7684\u4e0d\u4f18\u5316\u7684\u811a\u672c\u7f16\u5199\uff0c\u5bfc\u81f4\u7684\u6027\u80fd\u95ee\u9898\uff0c\u5e76\u4e14\u5728\u4e5f\u63cf\u8ff0\u4e86\u600e\u6837\u53bb\u8ddf\u8e2a\u548c\u89e3\u51b3\u7a0b\u5e8f [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[865,582,866],"class_list":["post-6566","post","type-post","status-publish","format-standard","hentry","category-unix","tag-865","tag-582","tag-866"],"_links":{"self":[{"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/posts\/6566","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6566"}],"version-history":[{"count":1,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/posts\/6566\/revisions"}],"predecessor-version":[{"id":6575,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=\/wp\/v2\/posts\/6566\/revisions\/6575"}],"wp:attachment":[{"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6566"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6566"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hefeiyu.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6566"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}