{"id":60759,"date":"2024-10-13T05:34:14","date_gmt":"2024-10-12T21:34:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60759\/"},"modified":"2024-10-13T05:34:14","modified_gmt":"2024-10-12T21:34:14","slug":"db2%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a3%a1%e9%9d%a2%e6%ad%a3%e7%a2%ba%e6%9b%b4%e6%96%b0%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83%e7%9a%84%e6%93%8d%e4%bd%9c%e6%ad%a5%e9%a9%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60759\/","title":{"rendered":"DB2\u6578\u64da\u5eab\u88e1\u9762\u6b63\u78ba\u66f4\u65b0\u57f7\u884c\u8a08\u5283\u7684\u64cd\u4f5c\u6b65\u9a5f"},"content":{"rendered":"<h1 id=\"db2%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a3%a1%e9%9d%a2%e6%ad%a3%e7%a2%ba%e6%9b%b4%e6%96%b0%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83%e7%9a%84%e6%93%8d%e4%bd%9c%e6%ad%a5%e9%a9%9f-rmcEMLyYGx\">DB2\u6578\u64da\u5eab\u88e1\u9762\u6b63\u78ba\u66f4\u65b0\u57f7\u884c\u8a08\u5283\u7684\u64cd\u4f5c\u6b65\u9a5f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u57f7\u884c\u8a08\u5283\u7684\u512a\u5316\u5c0d\u65bc\u63d0\u5347\u67e5\u8a62\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002DB2\u6578\u64da\u5eab\u4f5c\u70baIBM\u7684\u4e00\u6b3e\u5f37\u5927\u6578\u64da\u5eab\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u548c\u65b9\u6cd5\u4f86\u66f4\u65b0\u548c\u512a\u5316\u57f7\u884c\u8a08\u5283\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5728DB2\u6578\u64da\u5eab\u4e2d\u6b63\u78ba\u66f4\u65b0\u57f7\u884c\u8a08\u5283\u7684\u64cd\u4f5c\u6b65\u9a5f\uff0c\u5e6b\u52a9\u7528\u6236\u66f4\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83%ef%bc%9f-rmcEMLyYGx\">\u4ec0\u9ebc\u662f\u57f7\u884c\u8a08\u5283\uff1f<\/h2>\n<p>\u57f7\u884c\u8a08\u5283\u662f\u6578\u64da\u5eab\u7cfb\u7d71\u7528\u4f86\u57f7\u884cSQL\u67e5\u8a62\u7684\u6b65\u9a5f\u548c\u7b56\u7565\u3002\u5b83\u63cf\u8ff0\u4e86\u6578\u64da\u5eab\u5982\u4f55\u8a2a\u554f\u6578\u64da\uff0c\u5305\u62ec\u4f7f\u7528\u7684\u7d22\u5f15\u3001\u9023\u63a5\u65b9\u6cd5\u548c\u6578\u64da\u6aa2\u7d22\u7684\u9806\u5e8f\u3002\u6b63\u78ba\u7684\u57f7\u884c\u8a08\u5283\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u7684\u6548\u7387\uff0c\u53cd\u4e4b\u5247\u53ef\u80fd\u5c0e\u81f4\u6027\u80fd\u74f6\u9838\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e6%9b%b4%e6%96%b0%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83%ef%bc%9f-rmcEMLyYGx\">\u70ba\u4ec0\u9ebc\u9700\u8981\u66f4\u65b0\u57f7\u884c\u8a08\u5283\uff1f<\/h2>\n<p>\u96a8\u8457\u6578\u64da\u7684\u589e\u9577\u548c\u7d50\u69cb\u7684\u8b8a\u5316\uff0c\u539f\u6709\u7684\u57f7\u884c\u8a08\u5283\u53ef\u80fd\u4e0d\u518d\u9069\u7528\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u9700\u8981\u66f4\u65b0\u57f7\u884c\u8a08\u5283\u7684\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li>\u6578\u64da\u8868\u7d50\u69cb\u767c\u751f\u8b8a\u5316\uff0c\u4f8b\u5982\u65b0\u589e\u6216\u522a\u9664\u5217\u3002<\/li>\n<li>\u6578\u64da\u91cf\u5927\u5e45\u8b8a\u5316\uff0c\u5f71\u97ff\u4e86\u7d22\u5f15\u7684\u9078\u64c7\u3002<\/li>\n<li>\u67e5\u8a62\u7684\u908f\u8f2f\u6216\u689d\u4ef6\u767c\u751f\u8b8a\u5316\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%9b%b4%e6%96%b0%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83%e7%9a%84%e6%93%8d%e4%bd%9c%e6%ad%a5%e9%a9%9f-rmcEMLyYGx\">\u66f4\u65b0\u57f7\u884c\u8a08\u5283\u7684\u64cd\u4f5c\u6b65\u9a5f<\/h2>\n<h3 id=\"1-%e7%a2%ba%e8%aa%8d%e7%95%b6%e5%89%8d%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83-rmcEMLyYGx\">1. \u78ba\u8a8d\u7576\u524d\u57f7\u884c\u8a08\u5283<\/h3>\n<p>\u5728\u66f4\u65b0\u57f7\u884c\u8a08\u5283\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u78ba\u8a8d\u7576\u524d\u7684\u57f7\u884c\u8a08\u5283\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u4f86\u67e5\u770b\u57f7\u884c\u8a08\u5283\uff1a<\/p>\n<pre><code>EXPLAIN PLAN FOR \nSELECT * FROM your_table WHERE your_condition;<\/code><\/pre>\n<p>\u9019\u5c07\u986f\u793a\u7576\u524d\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u5e6b\u52a9\u4f60\u4e86\u89e3\u5176\u6027\u80fd\u74f6\u9838\u6240\u5728\u3002<\/p>\n<h3 id=\"2-%e6%94%b6%e9%9b%86%e7%b5%b1%e8%a8%88%e4%bf%a1%e6%81%af-rmcEMLyYGx\">2. \u6536\u96c6\u7d71\u8a08\u4fe1\u606f<\/h3>\n<p>DB2\u4f7f\u7528\u7d71\u8a08\u4fe1\u606f\u4f86\u751f\u6210\u6700\u4f73\u7684\u57f7\u884c\u8a08\u5283\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u4f86\u6536\u96c6\u7d71\u8a08\u4fe1\u606f\uff1a<\/p>\n<pre><code>RUNSTATS ON TABLE your_table;<\/code><\/pre>\n<p>\u9019\u5c07\u66f4\u65b0\u8868\u7684\u7d71\u8a08\u4fe1\u606f\uff0c\u5e6b\u52a9DB2\u751f\u6210\u66f4\u512a\u5316\u7684\u57f7\u884c\u8a08\u5283\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8optimize-for%e5%ad%90%e5%8f%a5-rmcEMLyYGx\">3. \u4f7f\u7528OPTIMIZE FOR\u5b50\u53e5<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528OPTIMIZE FOR\u5b50\u53e5\u4f86\u6307\u793aDB2\u751f\u6210\u7279\u5b9a\u7684\u57f7\u884c\u8a08\u5283\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM your_table \nWHERE your_condition \nOPTIMIZE FOR 10 ROWS;<\/code><\/pre>\n<p>\u9019\u544a\u8a34DB2\u512a\u5316\u67e5\u8a62\u4ee5\u7372\u53d6\u5927\u7d0410\u884c\u7684\u7d50\u679c\uff0c\u5f9e\u800c\u53ef\u80fd\u751f\u6210\u66f4\u5408\u9069\u7684\u57f7\u884c\u8a08\u5283\u3002<\/p>\n<h3 id=\"4-%e9%87%8d%e6%96%b0%e7%b7%a8%e8%ad%af%e6%9f%a5%e8%a9%a2-rmcEMLyYGx\">4. \u91cd\u65b0\u7de8\u8b6f\u67e5\u8a62<\/h3>\n<p>\u5982\u679c\u4ee5\u4e0a\u6b65\u9a5f\u4ecd\u672a\u80fd\u6539\u5584\u57f7\u884c\u8a08\u5283\uff0c\u53ef\u4ee5\u8003\u616e\u91cd\u65b0\u7de8\u8b6f\u67e5\u8a62\u3002\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>REBIND your_package;<\/code><\/pre>\n<p>\u9019\u5c07\u5f37\u5236DB2\u91cd\u65b0\u751f\u6210\u57f7\u884c\u8a08\u5283\uff0c\u4e26\u8003\u616e\u6700\u65b0\u7684\u7d71\u8a08\u4fe1\u606f\u3002<\/p>\n<h3 id=\"5-%e6%b8%ac%e8%a9%a6%e5%92%8c%e9%a9%97%e8%ad%89-rmcEMLyYGx\">5. \u6e2c\u8a66\u548c\u9a57\u8b49<\/h3>\n<p>\u5728\u66f4\u65b0\u57f7\u884c\u8a08\u5283\u5f8c\uff0c\u52d9\u5fc5\u9032\u884c\u6e2c\u8a66\u4ee5\u9a57\u8b49\u6027\u80fd\u662f\u5426\u6709\u6240\u6539\u5584\u3002\u53ef\u4ee5\u4f7f\u7528EXPLAIN\u547d\u4ee4\u518d\u6b21\u67e5\u770b\u65b0\u7684\u57f7\u884c\u8a08\u5283\uff0c\u4e26\u8207\u4e4b\u524d\u7684\u8a08\u5283\u9032\u884c\u6bd4\u8f03\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-rmcEMLyYGx\">\u7e3d\u7d50<\/h2>\n<p>\u66f4\u65b0DB2\u6578\u64da\u5eab\u4e2d\u7684\u57f7\u884c\u8a08\u5283\u662f\u4e00\u500b\u91cd\u8981\u7684\u904e\u7a0b\uff0c\u80fd\u5920\u986f\u8457\u63d0\u5347\u67e5\u8a62\u6027\u80fd\u3002\u901a\u904e\u78ba\u8a8d\u7576\u524d\u57f7\u884c\u8a08\u5283\u3001\u6536\u96c6\u7d71\u8a08\u4fe1\u606f\u3001\u4f7f\u7528OPTIMIZE FOR\u5b50\u53e5\u3001\u91cd\u65b0\u7de8\u8b6f\u67e5\u8a62\u4ee5\u53ca\u9032\u884c\u6e2c\u8a66\u548c\u9a57\u8b49\uff0c\u60a8\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u9ad8\u6548\u904b\u884c\u3002\u5c0d\u65bc\u9700\u8981\u7a69\u5b9a\u548c\u9ad8\u6548\u6027\u80fd\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\u4e5f\u662f\u4e00\u500b\u91cd\u8981\u7684\u8003\u91cf\uff0c\u9019\u6a23\u53ef\u4ee5\u70ba\u60a8\u7684\u6578\u64da\u5eab\u63d0\u4f9b\u66f4\u597d\u7684\u652f\u6301\u548c\u4fdd\u969c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3DB2\u6578\u64da\u5eab\u4e2d\u6b63\u78ba\u66f4\u65b0\u57f7\u884c\u8a08\u5283\u7684\u64cd\u4f5c\u6b65\u9a5f\uff0c\u63d0\u5347\u67e5\u8a62\u6027\u80fd\u8207\u6578\u64da\u8655\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-60759","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60759","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=60759"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60759\/revisions"}],"predecessor-version":[{"id":60760,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60759\/revisions\/60760"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60759"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60759"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60759"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}