{"id":94944,"date":"2024-10-19T20:56:18","date_gmt":"2024-10-19T12:56:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/94944\/"},"modified":"2024-10-19T20:56:18","modified_gmt":"2024-10-19T12:56:18","slug":"oracle%e6%9f%a5%e8%a9%a2%e4%b8%ad%e8%a1%a8%e7%9a%84%e9%80%a3%e6%8e%a5%e9%a0%86%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/94944\/","title":{"rendered":"oracle\u67e5\u8a62\u4e2d\u8868\u7684\u9023\u63a5\u9806\u5e8f"},"content":{"rendered":"<h1 id=\"oracle%e6%9f%a5%e8%a9%a2%e4%b8%ad%e8%a1%a8%e7%9a%84%e9%80%a3%e6%8e%a5%e9%a0%86%e5%ba%8f-qmnqxEWjcD\">Oracle\u67e5\u8a62\u4e2d\u8868\u7684\u9023\u63a5\u9806\u5e8f<\/h1>\n<p>\u5728\u4f7f\u7528Oracle\u8cc7\u6599\u5eab\u9032\u884c\u67e5\u8a62\u6642\uff0c\u8868\u7684\u9023\u63a5\u9806\u5e8f\u5c0d\u67e5\u8a62\u6027\u80fd\u6709\u8457\u91cd\u8981\u5f71\u97ff\u3002\u4e86\u89e3\u5982\u4f55\u63a7\u5236\u548c\u512a\u5316\u9019\u4e00\u904e\u7a0b\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u548c\u8cc7\u6599\u5eab\u7ba1\u7406\u54e1\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u6e1b\u5c11\u8cc7\u6e90\u6d88\u8017\u3002\u672c\u6587\u5c07\u63a2\u8a0eOracle\u67e5\u8a62\u4e2d\u8868\u7684\u9023\u63a5\u9806\u5e8f\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u5efa\u8b70\u3002<\/p>\n<h2 id=\"%e9%80%a3%e6%8e%a5%e9%a0%86%e5%ba%8f%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-qmnqxEWjcD\">\u9023\u63a5\u9806\u5e8f\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5728SQL\u67e5\u8a62\u4e2d\uff0c\u7576\u6d89\u53ca\u591a\u500b\u8868\u7684\u9023\u63a5\u6642\uff0cOracle\u8cc7\u6599\u5eab\u6703\u6839\u64da\u5176\u5167\u90e8\u7684\u512a\u5316\u5668\u4f86\u6c7a\u5b9a\u9023\u63a5\u7684\u9806\u5e8f\u3002\u9019\u4e00\u904e\u7a0b\u7a31\u70ba\u300c\u67e5\u8a62\u512a\u5316\u300d\u3002\u512a\u5316\u5668\u6703\u8003\u616e\u591a\u7a2e\u56e0\u7d20\uff0c\u5305\u62ec\u8868\u7684\u5927\u5c0f\u3001\u7d22\u5f15\u7684\u5b58\u5728\u8207\u5426\u3001\u7d71\u8a08\u4fe1\u606f\u7b49\uff0c\u4f86\u9078\u64c7\u6700\u6709\u6548\u7684\u9023\u63a5\u9806\u5e8f\u3002<\/p>\n<h2 id=\"%e9%80%a3%e6%8e%a5%e9%a1%9e%e5%9e%8b-qmnqxEWjcD\">\u9023\u63a5\u985e\u578b<\/h2>\n<p>\u5728Oracle\u4e2d\uff0c\u4e3b\u8981\u6709\u4e09\u7a2e\u9023\u63a5\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u5167\u90e8\u9023\u63a5\uff08INNER JOIN\uff09<\/strong>: \u53ea\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>\u5916\u90e8\u9023\u63a5\uff08OUTER JOIN\uff09<\/strong>: \u8fd4\u56de\u4e00\u500b\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5728\u53e6\u4e00\u500b\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>\u4ea4\u53c9\u9023\u63a5\uff08CROSS JOIN\uff09<\/strong>: \u8fd4\u56de\u5169\u500b\u8868\u7684\u7b1b\u5361\u723e\u7a4d\uff0c\u5373\u6bcf\u500b\u8868\u7684\u6bcf\u4e00\u884c\u90fd\u8207\u53e6\u4e00\u500b\u8868\u7684\u6bcf\u4e00\u884c\u76f8\u9023\u63a5\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%bd%b1%e9%9f%bf%e9%80%a3%e6%8e%a5%e9%a0%86%e5%ba%8f-qmnqxEWjcD\">\u5982\u4f55\u5f71\u97ff\u9023\u63a5\u9806\u5e8f<\/h2>\n<p>\u96d6\u7136Oracle\u7684\u512a\u5316\u5668\u6703\u81ea\u52d5\u9078\u64c7\u9023\u63a5\u9806\u5e8f\uff0c\u4f46\u958b\u767c\u8005\u4ecd\u7136\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u5f0f\u4f86\u5f71\u97ff\u9019\u4e00\u904e\u7a0b\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e6%8f%90%e7%a4%ba%ef%bc%88hints%ef%bc%89-qmnqxEWjcD\">1. \u4f7f\u7528\u63d0\u793a\uff08Hints\uff09<\/h3>\n<p>Oracle\u63d0\u4f9b\u4e86\u591a\u7a2e\u63d0\u793a\uff0c\u53ef\u4ee5\u7528\u4f86\u6307\u5c0e\u512a\u5316\u5668\u9078\u64c7\u7279\u5b9a\u7684\u9023\u63a5\u9806\u5e8f\u3002\u4f8b\u5982\uff0c\u4f7f\u7528\u4ee5\u4e0b\u63d0\u793a\u53ef\u4ee5\u5f37\u5236\u512a\u5316\u5668\u6309\u7167\u6307\u5b9a\u7684\u9806\u5e8f\u9032\u884c\u9023\u63a5\uff1a<\/p>\n<pre><code>SELECT \/*+ FIRST_ROWS *\/ *\nFROM table1 t1, table2 t2\nWHERE t1.id = t2.id;<\/code><\/pre>\n<h3 id=\"2-%e8%aa%bf%e6%95%b4%e7%b5%b1%e8%a8%88%e4%bf%a1%e6%81%af-qmnqxEWjcD\">2. \u8abf\u6574\u7d71\u8a08\u4fe1\u606f<\/h3>\n<p>\u78ba\u4fdd\u8cc7\u6599\u5eab\u4e2d\u7684\u7d71\u8a08\u4fe1\u606f\u662f\u6700\u65b0\u7684\uff0c\u9019\u6a23\u512a\u5316\u5668\u624d\u80fd\u505a\u51fa\u66f4\u597d\u7684\u6c7a\u7b56\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u4f86\u6536\u96c6\u7d71\u8a08\u4fe1\u606f\uff1a<\/p>\n<pre><code>EXEC DBMS_STATS.GATHER_TABLE_STATS('schema_name', 'table_name');<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-qmnqxEWjcD\">3. \u4f7f\u7528\u7d22\u5f15<\/h3>\n<p>\u9069\u7576\u7684\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u78ba\u4fdd\u5728\u9023\u63a5\u7684\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u9019\u6a23\u512a\u5316\u5668\u5728\u9078\u64c7\u9023\u63a5\u9806\u5e8f\u6642\u6703\u8003\u616e\u5230\u9019\u4e9b\u7d22\u5f15\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e6%80%a7%e8%83%bd%e7%9a%84%e6%b8%ac%e8%a9%a6-qmnqxEWjcD\">\u67e5\u8a62\u6027\u80fd\u7684\u6e2c\u8a66<\/h2>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u6e2c\u8a66\u4e0d\u540c\u7684\u67e5\u8a62\u548c\u9023\u63a5\u9806\u5e8f\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u4f86\u8a55\u4f30\u67e5\u8a62\u6027\u80fd\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528 <code>EXPLAIN PLAN<\/code> \u547d\u4ee4\u4f86\u67e5\u770b\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\u3002<\/li>\n<li>\u6e2c\u8a66\u4e0d\u540c\u7684\u9023\u63a5\u9806\u5e8f\uff0c\u4e26\u6bd4\u8f03\u5176\u57f7\u884c\u6642\u9593\u3002<\/li>\n<li>\u76e3\u63a7\u7cfb\u7d71\u8cc7\u6e90\u7684\u4f7f\u7528\u60c5\u6cc1\uff0c\u5982CPU\u548c\u5167\u5b58\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-qmnqxEWjcD\">\u7d50\u8ad6<\/h2>\n<p>\u5728Oracle\u67e5\u8a62\u4e2d\uff0c\u8868\u7684\u9023\u63a5\u9806\u5e8f\u5c0d\u67e5\u8a62\u6027\u80fd\u6709\u8457\u6df1\u9060\u7684\u5f71\u97ff\u3002\u901a\u904e\u7406\u89e3\u9023\u63a5\u7684\u57fa\u672c\u6982\u5ff5\u3001\u4f7f\u7528\u63d0\u793a\u3001\u8abf\u6574\u7d71\u8a08\u4fe1\u606f\u4ee5\u53ca\u9069\u7576\u4f7f\u7528\u7d22\u5f15\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u512a\u5316\u67e5\u8a62\u6027\u80fd\u3002\u6301\u7e8c\u7684\u6e2c\u8a66\u548c\u76e3\u63a7\u5c07\u6709\u52a9\u65bc\u78ba\u4fdd\u8cc7\u6599\u5eab\u7684\u9ad8\u6548\u904b\u884c\u3002<\/p>\n<p>\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u63d0\u5347\u60a8\u7684\u8cc7\u6599\u5eab\u6027\u80fd\uff0c\u60a8\u53ef\u4ee5\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u89e3\u6c7a\u65b9\u6848\uff0c\u4ee5\u7372\u5f97\u66f4\u597d\u7684\u8cc7\u6e90\u914d\u7f6e\u548c\u6027\u80fd\u8868\u73fe\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Oracle\u67e5\u8a62\u4e2d\u8868\u7684\u9023\u63a5\u9806\u5e8f\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u512a\u5316\u6027\u80fd\uff0c\u638c\u63e1\u6700\u4f73\u5be6\u8e10\uff0c\u8b93\u6578\u64da\u8655\u7406\u66f4\u6d41\u66a2\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-94944","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94944","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=94944"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94944\/revisions"}],"predecessor-version":[{"id":94945,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94944\/revisions\/94945"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=94944"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=94944"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=94944"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}