{"id":162329,"date":"2024-11-04T14:09:01","date_gmt":"2024-11-04T06:09:01","guid":{"rendered":"https:\/\/server.hk\/cnblog\/162329\/"},"modified":"2024-11-04T14:09:02","modified_gmt":"2024-11-04T06:09:02","slug":"%e7%b0%a1%e5%96%ae%e4%bb%8b%e7%b4%b9-oracle-%e9%a9%85%e5%8b%95%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/162329\/","title":{"rendered":"\u7c21\u55ae\u4ecb\u7d39 Oracle \u9a45\u52d5\u8868"},"content":{"rendered":"<h1 id=\"%e7%b0%a1%e5%96%ae%e4%bb%8b%e7%b4%b9-oracle-%e9%a9%85%e5%8b%95%e8%a1%a8-aWaACbIoYL\">\u7c21\u55ae\u4ecb\u7d39 Oracle \u9a45\u52d5\u8868<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u9a45\u52d5\u8868\uff08Driving Table\uff09\u662f\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u5c24\u5176\u662f\u5728\u4f7f\u7528 Oracle \u6578\u64da\u5eab\u6642\u3002\u9a45\u52d5\u8868\u662f\u6307\u5728\u57f7\u884c\u67e5\u8a62\u6642\uff0c\u9996\u5148\u88ab\u9078\u64c7\u4f86\u9032\u884c\u6578\u64da\u6aa2\u7d22\u7684\u8868\u3002\u9019\u500b\u6982\u5ff5\u5c0d\u65bc\u512a\u5316\u67e5\u8a62\u6027\u80fd\u81f3\u95dc\u91cd\u8981\uff0c\u56e0\u70ba\u9078\u64c7\u5408\u9069\u7684\u9a45\u52d5\u8868\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u7684\u57f7\u884c\u6642\u9593\u3002<\/p>\n<h2 id=\"%e9%a9%85%e5%8b%95%e8%a1%a8%e7%9a%84%e9%81%b8%e6%93%87-aWaACbIoYL\">\u9a45\u52d5\u8868\u7684\u9078\u64c7<\/h2>\n<p>\u5728 Oracle \u6578\u64da\u5eab\u4e2d\uff0c\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\u6703\u6c7a\u5b9a\u54ea\u4e00\u500b\u8868\u4f5c\u70ba\u9a45\u52d5\u8868\u3002\u901a\u5e38\uff0c\u9a45\u52d5\u8868\u7684\u9078\u64c7\u57fa\u65bc\u4ee5\u4e0b\u5e7e\u500b\u56e0\u7d20\uff1a<\/p>\n<ul>\n<li><strong>\u8868\u7684\u5927\u5c0f\uff1a<\/strong>\u901a\u5e38\u60c5\u6cc1\u4e0b\uff0c\u8f03\u5c0f\u7684\u8868\u6703\u88ab\u9078\u70ba\u9a45\u52d5\u8868\uff0c\u56e0\u70ba\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u9700\u8981\u8655\u7406\u7684\u6578\u64da\u91cf\u3002<\/li>\n<li><strong>\u7d22\u5f15\u7684\u4f7f\u7528\uff1a<\/strong>\u5982\u679c\u67d0\u500b\u8868\u6709\u9069\u7576\u7684\u7d22\u5f15\uff0cOracle \u53ef\u80fd\u6703\u9078\u64c7\u9019\u500b\u8868\u4f5c\u70ba\u9a45\u52d5\u8868\uff0c\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002<\/li>\n<li><strong>\u904e\u6ffe\u689d\u4ef6\uff1a<\/strong>\u5982\u679c\u67d0\u500b\u8868\u7684\u904e\u6ffe\u689d\u4ef6\u80fd\u5920\u6709\u6548\u5730\u6e1b\u5c11\u8fd4\u56de\u7684\u884c\u6578\uff0c\u9019\u500b\u8868\u4e5f\u53ef\u80fd\u88ab\u9078\u70ba\u9a45\u52d5\u8868\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%a9%85%e5%8b%95%e8%a1%a8%e7%9a%84%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83-aWaACbIoYL\">\u9a45\u52d5\u8868\u7684\u57f7\u884c\u8a08\u5283<\/h2>\n<p>\u5728 Oracle \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>EXPLAIN PLAN<\/code> \u8a9e\u53e5\u4f86\u67e5\u770b\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\u3002\u9019\u500b\u8a08\u5283\u6703\u986f\u793a Oracle \u5982\u4f55\u9078\u64c7\u9a45\u52d5\u8868\u4ee5\u53ca\u57f7\u884c\u67e5\u8a62\u7684\u6b65\u9a5f\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>EXPLAIN PLAN FOR\nSELECT a.column1, b.column2\nFROM table_a a\nJOIN table_b b ON a.id = b.a_id\nWHERE a.status = 'active';\n<\/code><\/pre>\n<p>\u57f7\u884c\u4e0a\u8ff0\u8a9e\u53e5\u5f8c\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u67e5\u770b\u57f7\u884c\u8a08\u5283\uff1a<\/p>\n<pre><code>SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY);\n<\/code><\/pre>\n<p>\u9019\u5c07\u986f\u793a Oracle \u5982\u4f55\u8655\u7406\u67e5\u8a62\uff0c\u5305\u62ec\u9078\u64c7\u7684\u9a45\u52d5\u8868\u548c\u5176\u4ed6\u76f8\u95dc\u4fe1\u606f\u3002<\/p>\n<h2 id=\"%e9%a9%85%e5%8b%95%e8%a1%a8%e7%9a%84%e5%84%aa%e5%8c%96-aWaACbIoYL\">\u9a45\u52d5\u8868\u7684\u512a\u5316<\/h2>\n<p>\u70ba\u4e86\u512a\u5316\u67e5\u8a62\u6027\u80fd\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8003\u616e\u4ee5\u4e0b\u5e7e\u500b\u7b56\u7565\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u5408\u9069\u7684\u7d22\u5f15\uff1a<\/strong>\u78ba\u4fdd\u9a45\u52d5\u8868\u4e0a\u7684\u5217\u6709\u9069\u7576\u7684\u7d22\u5f15\uff0c\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002<\/li>\n<li><strong>\u8abf\u6574\u67e5\u8a62\u7d50\u69cb\uff1a<\/strong>\u6839\u64da\u6578\u64da\u7684\u7279\u6027\uff0c\u8abf\u6574\u67e5\u8a62\u7684\u7d50\u69cb\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u4e0d\u540c\u7684\u9a45\u52d5\u8868\u9078\u64c7\u3002<\/li>\n<li><strong>\u5206\u6790\u8868\u7d71\u8a08\u4fe1\u606f\uff1a<\/strong>\u5b9a\u671f\u66f4\u65b0\u8868\u7684\u7d71\u8a08\u4fe1\u606f\uff0c\u4ee5\u5e6b\u52a9 Oracle \u66f4\u597d\u5730\u9078\u64c7\u9a45\u52d5\u8868\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-aWaACbIoYL\">\u7d50\u8ad6<\/h2>\n<p>\u9a45\u52d5\u8868\u5728 Oracle \u6578\u64da\u5eab\u7684\u67e5\u8a62\u57f7\u884c\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u89d2\u8272\u3002\u901a\u904e\u5408\u7406\u7684\u9078\u64c7\u548c\u512a\u5316\u9a45\u52d5\u8868\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4e86\u89e3\u9a45\u52d5\u8868\u7684\u6982\u5ff5\u53ca\u5176\u5728\u67e5\u8a62\u4e2d\u7684\u4f5c\u7528\uff0c\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u548c\u6027\u80fd\u8abf\u512a\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<p>\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3\u6709\u95dc <a href=\"https:\/\/server.hk\">VPS<\/a> \u548c\u5176\u4ed6\u6578\u64da\u5eab\u7ba1\u7406\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7c21\u55ae\u4ecb\u7d39 Oracle \u9a45\u52d5\u8868\uff0c\u4e86\u89e3\u5176\u529f\u80fd\u3001\u7d50\u69cb\u53ca\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u7684\u61c9\u7528\uff0c\u52a9\u60a8\u63d0\u5347\u6578\u64da\u8655\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-162329","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162329","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=162329"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162329\/revisions"}],"predecessor-version":[{"id":162330,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162329\/revisions\/162330"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=162329"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=162329"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=162329"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}