{"id":190876,"date":"2024-11-12T15:45:28","date_gmt":"2024-11-12T07:45:28","guid":{"rendered":"https:\/\/server.hk\/cnblog\/190876\/"},"modified":"2024-11-12T15:45:30","modified_gmt":"2024-11-12T07:45:30","slug":"%e9%96%92%e8%ab%87oracle%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83%e7%9a%84%e6%ad%a5%e9%a9%9f%e9%a0%86%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/190876\/","title":{"rendered":"\u9592\u8ac7Oracle\u57f7\u884c\u8a08\u5283\u7684\u6b65\u9a5f\u9806\u5e8f"},"content":{"rendered":"<h1 id=\"%e9%96%92%e8%ab%87oracle%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83%e7%9a%84%e6%ad%a5%e9%a9%9f%e9%a0%86%e5%ba%8f-pfJfOaqLLw\">\u9592\u8ac7Oracle\u57f7\u884c\u8a08\u5283\u7684\u6b65\u9a5f\u9806\u5e8f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cOracle\u57f7\u884c\u8a08\u5283\u662f\u512a\u5316\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u5de5\u5177\u3002\u7406\u89e3\u57f7\u884c\u8a08\u5283\u7684\u6b65\u9a5f\u9806\u5e8f\u4e0d\u50c5\u80fd\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\uff08DBA\uff09\u66f4\u6709\u6548\u5730\u64b0\u5beb\u67e5\u8a62\uff0c\u9084\u80fd\u63d0\u9ad8\u6574\u9ad4\u7cfb\u7d71\u7684\u6548\u7387\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eOracle\u57f7\u884c\u8a08\u5283\u7684\u6b65\u9a5f\u9806\u5e8f\u53ca\u5176\u91cd\u8981\u6027\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%aforacle%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83%ef%bc%9f-pfJfOaqLLw\">\u4ec0\u9ebc\u662fOracle\u57f7\u884c\u8a08\u5283\uff1f<\/h2>\n<p>Oracle\u57f7\u884c\u8a08\u5283\u662fOracle\u6578\u64da\u5eab\u5728\u57f7\u884cSQL\u67e5\u8a62\u6642\u6240\u9078\u64c7\u7684\u64cd\u4f5c\u6b65\u9a5f\u7684\u8a73\u7d30\u63cf\u8ff0\u3002\u5b83\u986f\u793a\u4e86\u6578\u64da\u5eab\u5982\u4f55\u8a2a\u554f\u6578\u64da\uff0c\u5305\u62ec\u4f7f\u7528\u7684\u7d22\u5f15\u3001\u9023\u63a5\u985e\u578b\u3001\u6392\u5e8f\u548c\u904e\u6ffe\u7b49\u64cd\u4f5c\u3002\u57f7\u884c\u8a08\u5283\u53ef\u4ee5\u901a\u904e\u591a\u7a2e\u65b9\u5f0f\u751f\u6210\uff0c\u4f8b\u5982\u4f7f\u7528EXPLAIN PLAN\u8a9e\u53e5\u6216DBMS_XPLAN\u5305\u3002<\/p>\n<h2 id=\"%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83%e7%9a%84%e7%94%9f%e6%88%90%e6%ad%a5%e9%a9%9f-pfJfOaqLLw\">\u57f7\u884c\u8a08\u5283\u7684\u751f\u6210\u6b65\u9a5f<\/h2>\n<p>\u751f\u6210Oracle\u57f7\u884c\u8a08\u5283\u7684\u904e\u7a0b\u901a\u5e38\u5305\u62ec\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<ul>\n<li><strong>\u89e3\u6790\uff08Parsing\uff09\uff1a<\/strong>\u7576SQL\u67e5\u8a62\u88ab\u63d0\u4ea4\u6642\uff0cOracle\u9996\u5148\u6703\u89e3\u6790\u8a72\u67e5\u8a62\uff0c\u6aa2\u67e5\u8a9e\u6cd5\u548c\u8a9e\u7fa9\u7684\u6b63\u78ba\u6027\u3002\u9019\u4e00\u6b65\u9a5f\u78ba\u4fdd\u67e5\u8a62\u7684\u7d50\u69cb\u662f\u6709\u6548\u7684\u3002<\/li>\n<li><strong>\u512a\u5316\uff08Optimization\uff09\uff1a<\/strong>\u5728\u89e3\u6790\u5f8c\uff0cOracle\u6703\u9032\u884c\u67e5\u8a62\u512a\u5316\u3002\u9019\u4e00\u904e\u7a0b\u4e2d\uff0c\u6578\u64da\u5eab\u6703\u8003\u616e\u591a\u7a2e\u57f7\u884c\u8def\u5f91\uff0c\u4e26\u9078\u64c7\u6210\u672c\u6700\u4f4e\u7684\u65b9\u6848\u3002\u512a\u5316\u5668\u6703\u6839\u64da\u7d71\u8a08\u4fe1\u606f\u4f86\u6c7a\u5b9a\u4f7f\u7528\u54ea\u7a2e\u7d22\u5f15\u6216\u9023\u63a5\u65b9\u6cd5\u3002<\/li>\n<li><strong>\u57f7\u884c\uff08Execution\uff09\uff1a<\/strong>\u4e00\u65e6\u9078\u64c7\u4e86\u6700\u4f73\u7684\u57f7\u884c\u8a08\u5283\uff0cOracle\u5c07\u958b\u59cb\u57f7\u884c\u67e5\u8a62\u3002\u9019\u5305\u62ec\u5f9e\u78c1\u789f\u4e2d\u8b80\u53d6\u6578\u64da\u3001\u9032\u884c\u8a08\u7b97\u548c\u8fd4\u56de\u7d50\u679c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83%e7%9a%84%e6%ad%a5%e9%a9%9f%e9%a0%86%e5%ba%8f-pfJfOaqLLw\">\u57f7\u884c\u8a08\u5283\u7684\u6b65\u9a5f\u9806\u5e8f<\/h2>\n<p>\u5728\u57f7\u884c\u8a08\u5283\u4e2d\uff0c\u6b65\u9a5f\u7684\u9806\u5e8f\u901a\u5e38\u662f\u6839\u64da\u4ee5\u4e0b\u5e7e\u500b\u539f\u5247\u4f86\u78ba\u5b9a\u7684\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u8a2a\u554f\u9806\u5e8f\uff1a<\/strong>Oracle\u6703\u6839\u64da\u6578\u64da\u7684\u5b58\u5132\u65b9\u5f0f\u548c\u7d22\u5f15\u7684\u4f7f\u7528\u60c5\u6cc1\u4f86\u6c7a\u5b9a\u8a2a\u554f\u6578\u64da\u7684\u9806\u5e8f\u3002\u4f8b\u5982\uff0c\u4f7f\u7528\u7d22\u5f15\u7684\u67e5\u8a62\u901a\u5e38\u6703\u6bd4\u5168\u8868\u6383\u63cf\u66f4\u5feb\u3002<\/li>\n<li><strong>\u9023\u63a5\u9806\u5e8f\uff1a<\/strong>\u5728\u591a\u8868\u67e5\u8a62\u4e2d\uff0cOracle\u6703\u6839\u64da\u8868\u7684\u5927\u5c0f\u548c\u9023\u63a5\u689d\u4ef6\u4f86\u6c7a\u5b9a\u9023\u63a5\u7684\u9806\u5e8f\u3002\u901a\u5e38\uff0c\u8f03\u5c0f\u7684\u8868\u6703\u5148\u88ab\u8655\u7406\uff0c\u4ee5\u6e1b\u5c11\u4e2d\u9593\u7d50\u679c\u96c6\u7684\u5927\u5c0f\u3002<\/li>\n<li><strong>\u904e\u6ffe\u689d\u4ef6\u7684\u61c9\u7528\uff1a<\/strong>\u904e\u6ffe\u689d\u4ef6\u7684\u61c9\u7528\u9806\u5e8f\u4e5f\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\u3002Oracle\u6703\u512a\u5148\u61c9\u7528\u80fd\u5920\u5feb\u901f\u6392\u9664\u5927\u91cf\u4e0d\u5fc5\u8981\u6578\u64da\u7684\u904e\u6ffe\u689d\u4ef6\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e6%9f%a5%e7%9c%8b%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83-pfJfOaqLLw\">\u5982\u4f55\u67e5\u770b\u57f7\u884c\u8a08\u5283<\/h2>\n<p>\u8981\u67e5\u770bOracle\u7684\u57f7\u884c\u8a08\u5283\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>EXPLAIN PLAN FOR \nSELECT * FROM employees WHERE department_id = 10;<\/code><\/pre>\n<p>\u57f7\u884c\u4e0a\u8ff0\u8a9e\u53e5\u5f8c\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u67e5\u770b\u751f\u6210\u7684\u57f7\u884c\u8a08\u5283\uff1a<\/p>\n<pre><code>SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY);<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-pfJfOaqLLw\">\u7d50\u8ad6<\/h2>\n<p>\u7406\u89e3Oracle\u57f7\u884c\u8a08\u5283\u7684\u6b65\u9a5f\u9806\u5e8f\u5c0d\u65bc\u512a\u5316\u67e5\u8a62\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u89e3\u6790\u3001\u512a\u5316\u548c\u57f7\u884c\u7684\u904e\u7a0b\uff0c\u958b\u767c\u8005\u548cDBA\u53ef\u4ee5\u66f4\u597d\u5730\u638c\u63e1\u6578\u64da\u5eab\u7684\u904b\u4f5c\u65b9\u5f0f\uff0c\u5f9e\u800c\u63d0\u9ad8\u7cfb\u7d71\u7684\u6548\u7387\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u5c0d\u57f7\u884c\u8a08\u5283\u7684\u6df1\u5165\u5206\u6790\u5c07\u6210\u70ba\u78ba\u4fdd\u6578\u64da\u5eab\u6027\u80fd\u7684\u5fc5\u8981\u624b\u6bb5\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u9999\u6e2f\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u6709\u8208\u8da3\uff0c\u6216\u60f3\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u7684\u8cc7\u8a0a\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8a73\u7d30\u8cc7\u6599\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Oracle\u57f7\u884c\u8a08\u5283\u7684\u6b65\u9a5f\u9806\u5e8f\uff0c\u638c\u63e1\u67e5\u8a62\u512a\u5316\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u8207\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-190876","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/190876","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=190876"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/190876\/revisions"}],"predecessor-version":[{"id":190877,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/190876\/revisions\/190877"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=190876"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=190876"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=190876"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}