{"id":95914,"date":"2024-10-20T05:03:19","date_gmt":"2024-10-19T21:03:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95914\/"},"modified":"2024-10-20T05:03:20","modified_gmt":"2024-10-19T21:03:20","slug":"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e5%84%aa%e5%8c%96%e5%99%a8%e7%9a%84%e4%b8%89%e7%a8%ae%e9%a1%9e%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95914\/","title":{"rendered":"Oracle\u6578\u64da\u5eab\u512a\u5316\u5668\u7684\u4e09\u7a2e\u985e\u578b"},"content":{"rendered":"<h1 id=\"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e5%84%aa%e5%8c%96%e5%99%a8%e7%9a%84%e4%b8%89%e7%a8%ae%e9%a1%9e%e5%9e%8b-FbxHYyuFCQ\">Oracle\u6578\u64da\u5eab\u512a\u5316\u5668\u7684\u4e09\u7a2e\u985e\u578b<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u512a\u5316\u5668\u662f\u78ba\u4fdd\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u7d44\u4ef6\u3002Oracle\u6578\u64da\u5eab\u7684\u512a\u5316\u5668\u8ca0\u8cac\u6c7a\u5b9a\u5982\u4f55\u57f7\u884cSQL\u67e5\u8a62\uff0c\u4ee5\u6700\u6709\u6548\u7684\u65b9\u5f0f\u6aa2\u7d22\u6578\u64da\u3002\u6839\u64da\u4e0d\u540c\u7684\u9700\u6c42\u548c\u74b0\u5883\uff0cOracle\u63d0\u4f9b\u4e86\u4e09\u7a2e\u985e\u578b\u7684\u512a\u5316\u5668\uff1a\u6210\u672c\u512a\u5316\u5668\u3001\u898f\u5247\u512a\u5316\u5668\u548c\u81ea\u9069\u61c9\u512a\u5316\u5668\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u4e09\u7a2e\u985e\u578b\u7684\u7279\u9ede\u53ca\u5176\u9069\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"1-%e6%88%90%e6%9c%ac%e5%84%aa%e5%8c%96%e5%99%a8-cost-based-optimizer-cbo-FbxHYyuFCQ\">1. \u6210\u672c\u512a\u5316\u5668 (Cost-Based Optimizer, CBO)<\/h2>\n<p>\u6210\u672c\u512a\u5316\u5668\u662fOracle\u6578\u64da\u5eab\u4e2d\u6700\u5e38\u7528\u7684\u512a\u5316\u5668\u3002\u5b83\u6839\u64da\u67e5\u8a62\u7684\u57f7\u884c\u6210\u672c\u4f86\u9078\u64c7\u6700\u4f73\u7684\u57f7\u884c\u8a08\u5283\u3002CBO\u6703\u8003\u616e\u591a\u7a2e\u56e0\u7d20\uff0c\u5305\u62ec\u6578\u64da\u5206\u4f48\u3001\u7d22\u5f15\u7684\u4f7f\u7528\u60c5\u6cc1\u3001\u8868\u7684\u5927\u5c0f\u4ee5\u53ca\u7cfb\u7d71\u7684\u8ca0\u8f09\u7b49\u3002\u9019\u4e9b\u56e0\u7d20\u6703\u5f71\u97ff\u67e5\u8a62\u7684\u57f7\u884c\u6642\u9593\u548c\u8cc7\u6e90\u6d88\u8017\u3002<\/p>\n<h3 id=\"%e7%89%b9%e9%bb%9e-FbxHYyuFCQ\">\u7279\u9ede<\/h3>\n<ul>\n<li>\u57fa\u65bc\u7d71\u8a08\u4fe1\u606f\uff1aCBO\u4f9d\u8cf4\u65bc\u6578\u64da\u5eab\u4e2d\u7684\u7d71\u8a08\u4fe1\u606f\uff0c\u9019\u4e9b\u4fe1\u606f\u53ef\u4ee5\u901a\u904eDBMS_STATS\u5305\u9032\u884c\u6536\u96c6\u548c\u66f4\u65b0\u3002<\/li>\n<li>\u52d5\u614b\u8abf\u6574\uff1aCBO\u80fd\u5920\u6839\u64da\u7576\u524d\u7684\u6578\u64da\u72c0\u614b\u548c\u7cfb\u7d71\u8ca0\u8f09\u52d5\u614b\u8abf\u6574\u67e5\u8a62\u8a08\u5283\u3002<\/li>\n<li>\u9069\u7528\u65bc\u8907\u96dc\u67e5\u8a62\uff1a\u5c0d\u65bc\u6d89\u53ca\u591a\u500b\u8868\u548c\u8907\u96dc\u689d\u4ef6\u7684\u67e5\u8a62\uff0cCBO\u901a\u5e38\u80fd\u63d0\u4f9b\u66f4\u512a\u7684\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-FbxHYyuFCQ\">\u793a\u4f8b<\/h3>\n<pre><code>SELECT * FROM employees WHERE department_id = 10;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0cCBO\u6703\u8003\u616eemployees\u8868\u7684\u5927\u5c0f\u3001department_id\u7684\u7d22\u5f15\u4ee5\u53ca\u5176\u4ed6\u76f8\u95dc\u7d71\u8a08\u4fe1\u606f\uff0c\u4ee5\u9078\u64c7\u6700\u4f73\u7684\u57f7\u884c\u8a08\u5283\u3002<\/p>\n<h2 id=\"2-%e8%a6%8f%e5%89%87%e5%84%aa%e5%8c%96%e5%99%a8-rule-based-optimizer-rbo-FbxHYyuFCQ\">2. \u898f\u5247\u512a\u5316\u5668 (Rule-Based Optimizer, RBO)<\/h2>\n<p>\u898f\u5247\u512a\u5316\u5668\u662fOracle\u65e9\u671f\u7248\u672c\u4e2d\u7684\u9810\u8a2d\u512a\u5316\u5668\u3002\u5b83\u57fa\u65bc\u4e00\u7d44\u56fa\u5b9a\u7684\u898f\u5247\u4f86\u6c7a\u5b9a\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u800c\u4e0d\u8003\u616e\u6578\u64da\u7684\u5be6\u969b\u72c0\u614b\u3002RBO\u7684\u512a\u5316\u904e\u7a0b\u76f8\u5c0d\u7c21\u55ae\uff0c\u4e3b\u8981\u4f9d\u8cf4\u65bc\u8868\u7684\u9806\u5e8f\u3001\u7d22\u5f15\u7684\u4f7f\u7528\u4ee5\u53ca\u806f\u63a5\u7684\u9806\u5e8f\u7b49\u975c\u614b\u898f\u5247\u3002<\/p>\n<h3 id=\"%e7%89%b9%e9%bb%9e-FbxHYyuFCQ\">\u7279\u9ede<\/h3>\n<ul>\n<li>\u975c\u614b\u898f\u5247\uff1aRBO\u4f7f\u7528\u4e00\u7d44\u9810\u5b9a\u7fa9\u7684\u898f\u5247\u4f86\u9078\u64c7\u57f7\u884c\u8a08\u5283\uff0c\u9019\u4e9b\u898f\u5247\u4e0d\u6703\u96a8\u8457\u6578\u64da\u7684\u8b8a\u5316\u800c\u6539\u8b8a\u3002<\/li>\n<li>\u7c21\u55ae\u6613\u7528\uff1a\u5c0d\u65bc\u7c21\u55ae\u67e5\u8a62\uff0cRBO\u7684\u6027\u80fd\u53ef\u80fd\u8db3\u5920\uff0c\u4f46\u5728\u8907\u96dc\u67e5\u8a62\u4e2d\u53ef\u80fd\u7121\u6cd5\u63d0\u4f9b\u6700\u4f73\u6027\u80fd\u3002<\/li>\n<li>\u9010\u6f38\u88ab\u6dd8\u6c70\uff1a\u96a8\u8457CBO\u7684\u5f15\u5165\u548c\u767c\u5c55\uff0cRBO\u5728\u65b0\u7248\u672c\u4e2d\u5df2\u7d93\u4e0d\u518d\u63a8\u85a6\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-FbxHYyuFCQ\">\u793a\u4f8b<\/h3>\n<pre><code>SELECT * FROM employees WHERE department_id = 10;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0cRBO\u6703\u6839\u64da\u56fa\u5b9a\u7684\u898f\u5247\u4f86\u6c7a\u5b9a\u57f7\u884c\u8a08\u5283\uff0c\u800c\u4e0d\u8003\u616e\u8868\u7684\u5be6\u969b\u6578\u64da\u5206\u4f48\u3002<\/p>\n<h2 id=\"3-%e8%87%aa%e9%81%a9%e6%87%89%e5%84%aa%e5%8c%96%e5%99%a8-adaptive-optimizer-FbxHYyuFCQ\">3. \u81ea\u9069\u61c9\u512a\u5316\u5668 (Adaptive Optimizer)<\/h2>\n<p>\u81ea\u9069\u61c9\u512a\u5316\u5668\u662fOracle 12c\u53ca\u4ee5\u5f8c\u7248\u672c\u4e2d\u5f15\u5165\u7684\u4e00\u7a2e\u65b0\u578b\u512a\u5316\u5668\u3002\u5b83\u7d50\u5408\u4e86CBO\u7684\u512a\u52e2\uff0c\u4e26\u80fd\u6839\u64da\u67e5\u8a62\u57f7\u884c\u904e\u7a0b\u4e2d\u7684\u5be6\u6642\u6578\u64da\u4f86\u8abf\u6574\u57f7\u884c\u8a08\u5283\u3002\u9019\u610f\u5473\u8457\u5728\u67e5\u8a62\u57f7\u884c\u904e\u7a0b\u4e2d\uff0c\u81ea\u9069\u61c9\u512a\u5316\u5668\u53ef\u4ee5\u6839\u64da\u5be6\u969b\u7684\u6578\u64da\u72c0\u614b\u9032\u884c\u8abf\u6574\uff0c\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<h3 id=\"%e7%89%b9%e9%bb%9e-FbxHYyuFCQ\">\u7279\u9ede<\/h3>\n<ul>\n<li>\u5be6\u6642\u8abf\u6574\uff1a\u81ea\u9069\u61c9\u512a\u5316\u5668\u80fd\u5920\u5728\u67e5\u8a62\u57f7\u884c\u904e\u7a0b\u4e2d\u6839\u64da\u5be6\u969b\u60c5\u6cc1\u8abf\u6574\u57f7\u884c\u8a08\u5283\u3002<\/li>\n<li>\u63d0\u9ad8\u6027\u80fd\uff1a\u901a\u904e\u52d5\u614b\u8abf\u6574\uff0c\u81ea\u9069\u61c9\u512a\u5316\u5668\u80fd\u5920\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<li>\u9069\u7528\u65bc\u8907\u96dc\u67e5\u8a62\uff1a\u7279\u5225\u662f\u5728\u8655\u7406\u8907\u96dc\u67e5\u8a62\u6642\uff0c\u81ea\u9069\u61c9\u512a\u5316\u5668\u80fd\u5920\u63d0\u4f9b\u66f4\u597d\u7684\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-FbxHYyuFCQ\">\u793a\u4f8b<\/h3>\n<pre><code>SELECT * FROM employees WHERE department_id = 10;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u81ea\u9069\u61c9\u512a\u5316\u5668\u53ef\u80fd\u6703\u6839\u64da\u57f7\u884c\u904e\u7a0b\u4e2d\u7684\u6578\u64da\u72c0\u614b\u4f86\u8abf\u6574\u67e5\u8a62\u8a08\u5283\uff0c\u4ee5\u7372\u5f97\u6700\u4f73\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-FbxHYyuFCQ\">\u7e3d\u7d50<\/h2>\n<p>Oracle\u6578\u64da\u5eab\u7684\u4e09\u7a2e\u985e\u578b\u512a\u5316\u5668\u5404\u6709\u5176\u7279\u9ede\u548c\u9069\u7528\u5834\u666f\u3002\u6210\u672c\u512a\u5316\u5668\u662f\u76ee\u524d\u6700\u5e38\u7528\u7684\u9078\u64c7\uff0c\u9069\u5408\u5927\u591a\u6578\u60c5\u6cc1\uff1b\u898f\u5247\u512a\u5316\u5668\u96d6\u7136\u7c21\u55ae\uff0c\u4f46\u5728\u8907\u96dc\u67e5\u8a62\u4e2d\u53ef\u80fd\u7121\u6cd5\u63d0\u4f9b\u6700\u4f73\u6027\u80fd\uff1b\u81ea\u9069\u61c9\u512a\u5316\u5668\u5247\u5728\u52d5\u614b\u8abf\u6574\u65b9\u9762\u8868\u73fe\u51fa\u8272\uff0c\u7279\u5225\u9069\u5408\u8907\u96dc\u67e5\u8a62\u3002\u4e86\u89e3\u9019\u4e9b\u512a\u5316\u5668\u7684\u7279\u6027\uff0c\u53ef\u4ee5\u5e6b\u52a9\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u66f4\u6709\u6548\u5730\u8a2d\u8a08\u548c\u512a\u5316\u67e5\u8a62\uff0c\u5f9e\u800c\u63d0\u9ad8\u6574\u9ad4\u7cfb\u7d71\u6027\u80fd\u3002\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u6280\u8853\u9700\u6c42\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\uff0c\u63a2\u7d22\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">VPS<\/a>\u89e3\u6c7a\u65b9\u6848\u53ca\u5176\u4ed6\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle\u6578\u64da\u5eab\u512a\u5316\u5668\u7684\u4e09\u7a2e\u985e\u578b\uff0c\u4e86\u89e3\u5176\u529f\u80fd\u8207\u61c9\u7528\uff0c\u63d0\u5347\u67e5\u8a62\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-95914","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95914","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=95914"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95914\/revisions"}],"predecessor-version":[{"id":95915,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95914\/revisions\/95915"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95914"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95914"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95914"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}