{"id":153689,"date":"2024-11-02T09:32:19","date_gmt":"2024-11-02T01:32:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/153689\/"},"modified":"2024-11-02T09:32:19","modified_gmt":"2024-11-02T01:32:19","slug":"%e4%bb%a3%e7%a2%bc%e8%ac%9b%e8%a7%a3oracle%e5%8f%af%e9%81%b8%e6%93%87%e6%80%a7","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/153689\/","title":{"rendered":"\u4ee3\u78bc\u8b1b\u89e3Oracle\u53ef\u9078\u64c7\u6027"},"content":{"rendered":"<h1 id=\"%e4%bb%a3%e7%a2%bc%e8%ac%9b%e8%a7%a3oracle%e5%8f%af%e9%81%b8%e6%93%87%e6%80%a7-jeCoSUmxiE\">\u4ee3\u78bc\u8b1b\u89e3Oracle\u53ef\u9078\u64c7\u6027<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cOracle\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7cfb\u7d71\u3002\u5b83\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u652f\u6301\u6578\u64da\u7684\u5b58\u5132\u3001\u6aa2\u7d22\u548c\u7ba1\u7406\u3002\u5176\u4e2d\u4e00\u500b\u91cd\u8981\u7684\u7279\u6027\u662f\u53ef\u9078\u64c7\u6027\uff08Selectivity\uff09\uff0c\u9019\u5728\u67e5\u8a62\u512a\u5316\u548c\u6027\u80fd\u8abf\u6574\u4e2d\u626e\u6f14\u8457\u95dc\u9375\u89d2\u8272\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eOracle\u4e2d\u7684\u53ef\u9078\u64c7\u6027\u6982\u5ff5\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u4ee3\u78bc\u793a\u4f8b\u4ee5\u5e6b\u52a9\u7406\u89e3\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%8f%af%e9%81%b8%e6%93%87%e6%80%a7%ef%bc%9f-jeCoSUmxiE\">\u4ec0\u9ebc\u662f\u53ef\u9078\u64c7\u6027\uff1f<\/h2>\n<p>\u53ef\u9078\u64c7\u6027\u662f\u6307\u5728\u67e5\u8a62\u4e2d\uff0c\u67d0\u500b\u689d\u4ef6\u80fd\u5920\u904e\u6ffe\u6389\u591a\u5c11\u6578\u64da\u7684\u80fd\u529b\u3002\u5177\u9ad4\u4f86\u8aaa\uff0c\u7576\u4e00\u500b\u67e5\u8a62\u689d\u4ef6\u80fd\u5920\u6709\u6548\u5730\u7e2e\u5c0f\u7d50\u679c\u96c6\u7684\u5927\u5c0f\u6642\uff0c\u6211\u5011\u5c31\u8aaa\u9019\u500b\u689d\u4ef6\u5177\u6709\u9ad8\u53ef\u9078\u64c7\u6027\u3002\u76f8\u53cd\uff0c\u5982\u679c\u689d\u4ef6\u5e7e\u4e4e\u4e0d\u904e\u6ffe\u6578\u64da\uff0c\u5247\u53ef\u9078\u64c7\u6027\u8f03\u4f4e\u3002<\/p>\n<p>\u5728Oracle\u4e2d\uff0c\u67e5\u8a62\u7684\u53ef\u9078\u64c7\u6027\u5c0d\u65bc\u67e5\u8a62\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002\u9ad8\u53ef\u9078\u64c7\u6027\u7684\u67e5\u8a62\u80fd\u5920\u66f4\u5feb\u5730\u8fd4\u56de\u7d50\u679c\uff0c\u56e0\u70ba\u5b83\u5011\u80fd\u5920\u5229\u7528\u7d22\u5f15\u4f86\u52a0\u901f\u6578\u64da\u6aa2\u7d22\u3002<\/p>\n<h2 id=\"%e5%8f%af%e9%81%b8%e6%93%87%e6%80%a7%e7%9a%84%e8%a8%88%e7%ae%97-jeCoSUmxiE\">\u53ef\u9078\u64c7\u6027\u7684\u8a08\u7b97<\/h2>\n<p>Oracle\u4f7f\u7528\u7d71\u8a08\u4fe1\u606f\u4f86\u8a08\u7b97\u53ef\u9078\u64c7\u6027\u3002\u9019\u4e9b\u7d71\u8a08\u4fe1\u606f\u5305\u62ec\u8868\u7684\u884c\u6578\u3001\u5217\u7684\u57fa\u6578\uff08\u4e0d\u540c\u503c\u7684\u6578\u91cf\uff09\u7b49\u3002\u6839\u64da\u9019\u4e9b\u4fe1\u606f\uff0cOracle\u80fd\u5920\u4f30\u7b97\u67e5\u8a62\u7684\u6210\u672c\uff0c\u4e26\u9078\u64c7\u6700\u4f73\u7684\u57f7\u884c\u8a08\u5283\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528Oracle\u7684DBMS_STATS\u5305\u4f86\u6536\u96c6\u7d71\u8a08\u4fe1\u606f\uff1a<\/p>\n<pre><code>BEGIN\n    DBMS_STATS.GATHER_TABLE_STATS(\n        ownname =&gt; 'YOUR_SCHEMA',\n        tabname =&gt; 'YOUR_TABLE',\n        estimate_percent =&gt; 100,\n        cascade =&gt; TRUE\n    );\nEND;\n<\/code><\/pre>\n<p>\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c\u6211\u5011\u4f7f\u7528DBMS_STATS.GATHER_TABLE_STATS\u4f86\u6536\u96c6\u6307\u5b9a\u8868\u7684\u7d71\u8a08\u4fe1\u606f\u3002\u9019\u4e9b\u4fe1\u606f\u5c07\u5e6b\u52a9Oracle\u8a08\u7b97\u53ef\u9078\u64c7\u6027\u4e26\u512a\u5316\u67e5\u8a62\u3002<\/p>\n<h2 id=\"%e5%8f%af%e9%81%b8%e6%93%87%e6%80%a7%e7%9a%84%e5%bd%b1%e9%9f%bf%e5%9b%a0%e7%b4%a0-jeCoSUmxiE\">\u53ef\u9078\u64c7\u6027\u7684\u5f71\u97ff\u56e0\u7d20<\/h2>\n<p>\u53ef\u9078\u64c7\u6027\u53d7\u5230\u591a\u7a2e\u56e0\u7d20\u7684\u5f71\u97ff\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u5217\u7684\u57fa\u6578\uff1a<\/strong>\u57fa\u6578\u8d8a\u9ad8\uff0c\u8a72\u5217\u7684\u53ef\u9078\u64c7\u6027\u901a\u5e38\u8d8a\u9ad8\u3002<\/li>\n<li><strong>\u6578\u64da\u5206\u4f48\uff1a<\/strong>\u5982\u679c\u6578\u64da\u5206\u4f48\u4e0d\u5747\u52fb\uff0c\u67d0\u4e9b\u503c\u53ef\u80fd\u6703\u5c0e\u81f4\u4f4e\u53ef\u9078\u64c7\u6027\u3002<\/li>\n<li><strong>\u7d22\u5f15\u7684\u4f7f\u7528\uff1a<\/strong>\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u7684\u53ef\u9078\u64c7\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96%e7%a4%ba%e4%be%8b-jeCoSUmxiE\">\u67e5\u8a62\u512a\u5316\u793a\u4f8b<\/h2>\n<p>\u70ba\u4e86\u63d0\u9ad8\u67e5\u8a62\u7684\u53ef\u9078\u64c7\u6027\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\u4f86\u52a0\u901f\u67e5\u8a62\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5275\u5efa\u7d22\u5f15\u4e26\u4f7f\u7528\u5b83\u4f86\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff1a<\/p>\n<pre><code>CREATE INDEX idx_example ON YOUR_TABLE (YOUR_COLUMN);\n\nSELECT * FROM YOUR_TABLE WHERE YOUR_COLUMN = 'some_value';\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u9996\u5148\u5275\u5efa\u4e86\u4e00\u500b\u7d22\u5f15\uff0c\u7136\u5f8c\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u8a72\u7d22\u5f15\u4f86\u904e\u6ffe\u6578\u64da\u3002\u9019\u6a23\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u7684\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-jeCoSUmxiE\">\u7d50\u8ad6<\/h2>\n<p>\u53ef\u9078\u64c7\u6027\u5728Oracle\u6578\u64da\u5eab\u4e2d\u662f\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u5c0d\u65bc\u67e5\u8a62\u6027\u80fd\u7684\u512a\u5316\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u7406\u89e3\u53ef\u9078\u64c7\u6027\u7684\u8a08\u7b97\u548c\u5f71\u97ff\u56e0\u7d20\uff0c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u8a2d\u8a08\u67e5\u8a62\u548c\u7d22\u5f15\uff0c\u4ee5\u63d0\u9ad8\u6574\u9ad4\u6027\u80fd\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u9999\u6e2f\u7684VPS\u74b0\u5883\u4e2d\u904b\u884cOracle\u6578\u64da\u5eab\u6709\u8208\u8da3\uff0c\u6216\u8005\u60f3\u4e86\u89e3\u66f4\u591a\u95dc\u65bc<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u7684\u8cc7\u8a0a\uff0c\u8acb\u96a8\u6642\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8a0eOracle\u7684\u53ef\u9078\u64c7\u6027\uff0c\u89e3\u6790\u5176\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\u7684\u61c9\u7528\u8207\u512a\u52e2\uff0c\u52a9\u60a8\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-153689","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153689","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=153689"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153689\/revisions"}],"predecessor-version":[{"id":153690,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153689\/revisions\/153690"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=153689"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=153689"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=153689"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}