{"id":15718,"date":"2023-12-04T22:02:02","date_gmt":"2023-12-04T14:02:02","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=15718"},"modified":"2023-12-04T22:03:02","modified_gmt":"2023-12-04T14:03:02","slug":"oracle-zhong-ru-he-sheng-chengexplain-plan-ni-zhi","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/04\/oracle-zhong-ru-he-sheng-chengexplain-plan-ni-zhi\/","title":{"rendered":"Oracle \u4e2d\u5982\u4f55\u751f\u6210explain plan\uff0c\u4f60\u77e5\u9053\u5417\uff1f"},"content":{"rendered":"<p>\u5728 Oracle \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>EXPLAIN PLAN<\/code> \u547d\u4ee4\u751f\u6210\u67e5\u8be2\u6267\u884c\u8ba1\u5212\uff0c\u4ee5\u4fbf\u4e86\u89e3 Oracle \u6570\u636e\u5e93\u5728\u6267\u884c\u7279\u5b9a\u67e5\u8be2\u65f6\u4f7f\u7528\u7684\u6267\u884c\u8ba1\u5212\u3002\u6267\u884c\u8ba1\u5212\u663e\u793a\u4e86 Oracle \u6570\u636e\u5e93\u5728\u6267\u884c\u67e5\u8be2\u65f6\u4f7f\u7528\u7684\u7b97\u6cd5\u548c\u8bbf\u95ee\u8def\u5f84\u3002<\/p>\n<p>\u8981\u751f\u6210\u67e5\u8be2\u7684\u6267\u884c\u8ba1\u5212\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n<ol>\n<li><strong>\u4f7f\u7528 <code>EXPLAIN PLAN<\/code> \u547d\u4ee4\uff1a<\/strong>\n<pre><code class=\"language-sql  line-numbers\">EXPLAIN PLAN FOR\nyour_query_here;\n<\/code><\/pre>\n<p>\u5c06 <code>your_query_here<\/code> \u66ff\u6362\u4e3a\u4f60\u8981\u68c0\u67e5\u6267\u884c\u8ba1\u5212\u7684\u67e5\u8be2\u8bed\u53e5\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u67e5\u770b\u6267\u884c\u8ba1\u5212\uff1a<\/strong><br \/>\n\u751f\u6210\u6267\u884c\u8ba1\u5212\u540e\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8be2\u6765\u67e5\u770b\u8ba1\u5212\uff1a<\/p>\n<pre><code class=\"language-sql  line-numbers\">SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY);\n<\/code><\/pre>\n<p>\u6216\u8005\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u53e5\u83b7\u53d6\u66f4\u8be6\u7ec6\u7684\u6267\u884c\u8ba1\u5212\uff1a<\/p>\n<pre><code class=\"language-sql  line-numbers\">SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY('PLAN_TABLE', 'PLAN_ID'));\n<\/code><\/pre>\n<p>\u5176\u4e2d <code>'PLAN_TABLE'<\/code> \u662f\u6267\u884c\u8ba1\u5212\u8868\u7684\u540d\u79f0\uff0c<code>'PLAN_ID'<\/code> \u662f\u4f60\u751f\u6210\u8ba1\u5212\u65f6\u83b7\u5f97\u7684\u8ba1\u5212 ID\u3002<\/p>\n<\/li>\n<\/ol>\n<p>\u8bf7\u786e\u4fdd\u5728\u8fd0\u884c <code>EXPLAIN PLAN<\/code> \u547d\u4ee4\u4e4b\u524d\uff0c\u5df2\u7ecf\u521b\u5efa\u4e86\u7528\u4e8e\u5b58\u50a8\u6267\u884c\u8ba1\u5212\u7684\u8868\uff08\u901a\u5e38\u662f <code>PLAN_TABLE<\/code>\uff09\uff0c\u5e76\u4e14\u5177\u6709\u6267\u884c\u8ba1\u5212\u7684\u6743\u9650\u3002\u6b64\u5916\uff0c<code>DBMS_XPLAN.DISPLAY<\/code> \u51fd\u6570\u7528\u4e8e\u683c\u5f0f\u5316\u548c\u663e\u793a\u6267\u884c\u8ba1\u5212\u3002<\/p>\n<p>\u901a\u8fc7\u67e5\u770b\u6267\u884c\u8ba1\u5212\uff0c\u53ef\u4ee5\u4e86\u89e3 Oracle \u6570\u636e\u5e93\u5728\u6267\u884c\u67e5\u8be2\u65f6\u9009\u62e9\u7684\u8bbf\u95ee\u8def\u5f84\u548c\u6267\u884c\u7b56\u7565\uff0c\u6709\u52a9\u4e8e\u8fdb\u884c\u6027\u80fd\u4f18\u5316\u548c\u8c03\u6574\u67e5\u8be2\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Oracle \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 EXPLAIN PLAN \u547d\u4ee4\u751f\u6210\u67e5\u8be2\u6267\u884c\u8ba1\u5212\uff0c\u4ee5\u4fbf\u4e86\u89e3 Oracle \u6570\u636e\u5e93 [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-15718","post","type-post","status-publish","format-standard","hentry","category-oracel"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15718","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=15718"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15718\/revisions"}],"predecessor-version":[{"id":15719,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15718\/revisions\/15719"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=15718"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=15718"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=15718"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}