{"id":60423,"date":"2024-10-13T02:44:18","date_gmt":"2024-10-12T18:44:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60423\/"},"modified":"2024-10-13T02:44:18","modified_gmt":"2024-10-12T18:44:18","slug":"db2%e6%9f%a5%e8%a9%a2%e7%ae%a1%e7%90%86%e5%af%a6%e7%94%a8%e7%a8%8b%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60423\/","title":{"rendered":"DB2\u67e5\u8a62\u7ba1\u7406\u5be6\u7528\u7a0b\u5e8f"},"content":{"rendered":"<h1 id=\"db2%e6%9f%a5%e8%a9%a2%e7%ae%a1%e7%90%86%e5%af%a6%e7%94%a8%e7%a8%8b%e5%ba%8f-pIWQEealoq\">DB2\u67e5\u8a62\u7ba1\u7406\u5be6\u7528\u7a0b\u5e8f<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08DBMS\uff09\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\u3002IBM\u7684DB2\u662f\u4e00\u6b3e\u529f\u80fd\u5f37\u5927\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u4f01\u696d\u74b0\u5883\u4e2d\u3002DB2\u67e5\u8a62\u7ba1\u7406\u5be6\u7528\u7a0b\u5e8f\u662fDB2\u7684\u4e00\u500b\u91cd\u8981\u7d44\u4ef6\uff0c\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u7ba1\u7406\u548c\u512a\u5316\u67e5\u8a62\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eDB2\u67e5\u8a62\u7ba1\u7406\u5be6\u7528\u7a0b\u5e8f\u7684\u529f\u80fd\u3001\u4f7f\u7528\u65b9\u6cd5\u53ca\u5176\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n<h2 id=\"db2%e6%9f%a5%e8%a9%a2%e7%ae%a1%e7%90%86%e5%af%a6%e7%94%a8%e7%a8%8b%e5%ba%8f%e6%a6%82%e8%bf%b0-pIWQEealoq\">DB2\u67e5\u8a62\u7ba1\u7406\u5be6\u7528\u7a0b\u5e8f\u6982\u8ff0<\/h2>\n<p>DB2\u67e5\u8a62\u7ba1\u7406\u5be6\u7528\u7a0b\u5e8f\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u5de5\u5177\u548c\u529f\u80fd\uff0c\u65e8\u5728\u5e6b\u52a9\u7528\u6236\u5206\u6790\u548c\u512a\u5316SQL\u67e5\u8a62\u3002\u9019\u4e9b\u5de5\u5177\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u8b58\u5225\u6027\u80fd\u74f6\u9838\uff0c\u4e26\u63d0\u4f9b\u5efa\u8b70\u4ee5\u6539\u5584\u67e5\u8a62\u6548\u7387\u3002DB2\u7684\u67e5\u8a62\u7ba1\u7406\u5be6\u7528\u7a0b\u5e8f\u5305\u62ec\u67e5\u8a62\u6027\u80fd\u5206\u6790\u3001\u67e5\u8a62\u512a\u5316\u548c\u67e5\u8a62\u57f7\u884c\u8a08\u5283\u7b49\u529f\u80fd\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e6%80%a7%e8%83%bd%e5%88%86%e6%9e%90-pIWQEealoq\">\u67e5\u8a62\u6027\u80fd\u5206\u6790<\/h2>\n<p>\u67e5\u8a62\u6027\u80fd\u5206\u6790\u662fDB2\u67e5\u8a62\u7ba1\u7406\u5be6\u7528\u7a0b\u5e8f\u7684\u4e00\u500b\u6838\u5fc3\u529f\u80fd\u3002\u7528\u6236\u53ef\u4ee5\u4f7f\u7528\u9019\u500b\u529f\u80fd\u4f86\u8a55\u4f30\u67e5\u8a62\u7684\u57f7\u884c\u6548\u7387\u3002DB2\u63d0\u4f9b\u4e86\u591a\u7a2e\u6027\u80fd\u6307\u6a19\uff0c\u4f8b\u5982\u57f7\u884c\u6642\u9593\u3001CPU\u4f7f\u7528\u7387\u548cI\/O\u64cd\u4f5c\u6578\u7b49\uff0c\u5e6b\u52a9\u7528\u6236\u4e86\u89e3\u67e5\u8a62\u7684\u6027\u80fd\u72c0\u6cc1\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8%e7%a4%ba%e4%be%8b-pIWQEealoq\">\u4f7f\u7528\u793a\u4f8b<\/h3>\n<pre><code>SELECT * FROM orders WHERE order_date &gt; '2023-01-01';\n<\/code><\/pre>\n<p>\u5728\u57f7\u884c\u4e0a\u8ff0\u67e5\u8a62\u5f8c\uff0c\u7528\u6236\u53ef\u4ee5\u4f7f\u7528DB2\u7684\u6027\u80fd\u5206\u6790\u5de5\u5177\u4f86\u67e5\u770b\u8a72\u67e5\u8a62\u7684\u57f7\u884c\u6642\u9593\u548c\u8cc7\u6e90\u6d88\u8017\u60c5\u6cc1\u3002\u9019\u4e9b\u6578\u64da\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u5224\u65b7\u67e5\u8a62\u662f\u5426\u9700\u8981\u512a\u5316\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96-pIWQEealoq\">\u67e5\u8a62\u512a\u5316<\/h2>\n<p>\u67e5\u8a62\u512a\u5316\u662f\u63d0\u9ad8DB2\u6027\u80fd\u7684\u53e6\u4e00\u500b\u91cd\u8981\u65b9\u9762\u3002DB2\u67e5\u8a62\u7ba1\u7406\u5be6\u7528\u7a0b\u5e8f\u63d0\u4f9b\u4e86\u591a\u7a2e\u512a\u5316\u5efa\u8b70\uff0c\u5e6b\u52a9\u7528\u6236\u6539\u9032\u67e5\u8a62\u7d50\u69cb\u3002\u4f8b\u5982\uff0cDB2\u53ef\u4ee5\u5efa\u8b70\u4f7f\u7528\u7d22\u5f15\u4f86\u52a0\u901f\u67e5\u8a62\uff0c\u6216\u662f\u91cd\u5beb\u67e5\u8a62\u4ee5\u6e1b\u5c11\u8cc7\u6e90\u6d88\u8017\u3002<\/p>\n<h3 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e4%bd%bf%e7%94%a8-pIWQEealoq\">\u7d22\u5f15\u7684\u4f7f\u7528<\/h3>\n<p>\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u6709\u6548\u5de5\u5177\u3002\u7528\u6236\u53ef\u4ee5\u6839\u64da\u67e5\u8a62\u7684\u7279\u9ede\u5275\u5efa\u9069\u7576\u7684\u7d22\u5f15\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u7d93\u5e38\u5728\u67d0\u500b\u5217\u4e0a\u9032\u884c\u7be9\u9078\u7684\u67e5\u8a62\uff0c\u5275\u5efa\u8a72\u5217\u7684\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\u3002<\/p>\n<pre><code>CREATE INDEX idx_order_date ON orders(order_date);\n<\/code><\/pre>\n<p>\u4e0a\u8ff0SQL\u8a9e\u53e5\u5c07\u5728\u201corders\u201d\u8868\u7684\u201corder_date\u201d\u5217\u4e0a\u5275\u5efa\u4e00\u500b\u7d22\u5f15\uff0c\u5f9e\u800c\u63d0\u9ad8\u57fa\u65bc\u8a72\u5217\u7684\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83-pIWQEealoq\">\u67e5\u8a62\u57f7\u884c\u8a08\u5283<\/h2>\n<p>\u67e5\u8a62\u57f7\u884c\u8a08\u5283\u662fDB2\u67e5\u8a62\u7ba1\u7406\u5be6\u7528\u7a0b\u5e8f\u7684\u53e6\u4e00\u500b\u91cd\u8981\u7d44\u4ef6\u3002\u57f7\u884c\u8a08\u5283\u986f\u793a\u4e86DB2\u5982\u4f55\u57f7\u884c\u7279\u5b9a\u7684SQL\u67e5\u8a62\uff0c\u5305\u62ec\u4f7f\u7528\u7684\u7d22\u5f15\u3001\u9023\u63a5\u65b9\u6cd5\u548c\u9810\u4f30\u7684\u6210\u672c\u7b49\u4fe1\u606f\u3002\u7528\u6236\u53ef\u4ee5\u901a\u904e\u5206\u6790\u57f7\u884c\u8a08\u5283\u4f86\u8b58\u5225\u6f5b\u5728\u7684\u6027\u80fd\u554f\u984c\u3002<\/p>\n<h3 id=\"%e6%9f%a5%e7%9c%8b%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83-pIWQEealoq\">\u67e5\u770b\u57f7\u884c\u8a08\u5283<\/h3>\n<pre><code>EXPLAIN PLAN FOR SELECT * FROM orders WHERE order_date &gt; '2023-01-01';\n<\/code><\/pre>\n<p>\u57f7\u884c\u4e0a\u8ff0\u8a9e\u53e5\u5f8c\uff0c\u7528\u6236\u53ef\u4ee5\u67e5\u770bDB2\u751f\u6210\u7684\u57f7\u884c\u8a08\u5283\uff0c\u5f9e\u4e2d\u7372\u53d6\u6709\u95dc\u67e5\u8a62\u6027\u80fd\u7684\u8a73\u7d30\u4fe1\u606f\u3002<\/p>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-pIWQEealoq\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<ul>\n<li>\u5b9a\u671f\u5206\u6790\u67e5\u8a62\u6027\u80fd\uff0c\u53ca\u6642\u767c\u73fe\u4e26\u89e3\u6c7a\u6027\u80fd\u74f6\u9838\u3002<\/li>\n<li>\u6839\u64da\u67e5\u8a62\u7279\u9ede\u5275\u5efa\u548c\u7dad\u8b77\u7d22\u5f15\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<li>\u4f7f\u7528\u57f7\u884c\u8a08\u5283\u5206\u6790\u5de5\u5177\uff0c\u6df1\u5165\u4e86\u89e3\u67e5\u8a62\u7684\u57f7\u884c\u904e\u7a0b\u3002<\/li>\n<li>\u5b9a\u671f\u66f4\u65b0\u7d71\u8a08\u4fe1\u606f\uff0c\u4ee5\u5e6b\u52a9DB2\u505a\u51fa\u66f4\u597d\u7684\u512a\u5316\u6c7a\u7b56\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-pIWQEealoq\">\u7e3d\u7d50<\/h2>\n<p>DB2\u67e5\u8a62\u7ba1\u7406\u5be6\u7528\u7a0b\u5e8f\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u7ba1\u7406\u548c\u512a\u5316SQL\u67e5\u8a62\u3002\u901a\u904e\u6027\u80fd\u5206\u6790\u3001\u67e5\u8a62\u512a\u5316\u548c\u57f7\u884c\u8a08\u5283\u5206\u6790\uff0c\u7528\u6236\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u82e5\u60a8\u5c0d\u65bc<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u6216<code><a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a><\/code>\u6709\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>DB2\u67e5\u8a62\u7ba1\u7406\u5be6\u7528\u7a0b\u5e8f\u63d0\u4f9b\u9ad8\u6548\u7684\u6578\u64da\u67e5\u8a62\u3001\u5206\u6790\u548c\u512a\u5316\u5de5\u5177\uff0c\u5e6b\u52a9\u7528\u6236\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u548c\u7ba1\u7406\u6548\u7387\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-60423","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60423","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=60423"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60423\/revisions"}],"predecessor-version":[{"id":60424,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60423\/revisions\/60424"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60423"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60423"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60423"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}