{"id":160195,"date":"2024-11-03T21:04:21","date_gmt":"2024-11-03T13:04:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160195\/"},"modified":"2024-11-03T21:04:22","modified_gmt":"2024-11-03T13:04:22","slug":"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-optimizer-hint","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160195\/","title":{"rendered":"OceanBase \u6559\u7a0b\uff1aOceanBase Optimizer Hint"},"content":{"rendered":"<h1 id=\"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-optimizer-hint-BnBzxcyRJI\">OceanBase \u6559\u7a0b\uff1aOceanBase Optimizer Hint<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u67e5\u8a62\u512a\u5316\u662f\u63d0\u5347\u6027\u80fd\u7684\u95dc\u9375\u56e0\u7d20\u4e4b\u4e00\u3002OceanBase \u4f5c\u70ba\u4e00\u500b\u9ad8\u6027\u80fd\u7684\u5206\u4f48\u5f0f\u6578\u64da\u5eab\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u512a\u5316\u5de5\u5177\uff0c\u5176\u4e2d\u4e4b\u4e00\u4fbf\u662f Optimizer Hint\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e OceanBase \u7684 Optimizer Hint\uff0c\u5e6b\u52a9\u7528\u6236\u66f4\u597d\u5730\u7406\u89e3\u5176\u529f\u80fd\u53ca\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-optimizer-hint%ef%bc%9f-BnBzxcyRJI\">\u4ec0\u9ebc\u662f Optimizer Hint\uff1f<\/h2>\n<p>Optimizer Hint \u662f\u4e00\u7a2e\u6307\u793a\u6578\u64da\u5eab\u67e5\u8a62\u512a\u5316\u5668\u5982\u4f55\u57f7\u884c\u67e5\u8a62\u7684\u63d0\u793a\u3002\u901a\u904e\u4f7f\u7528\u9019\u4e9b\u63d0\u793a\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5f71\u97ff\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u9019\u5728\u8655\u7406\u8907\u96dc\u67e5\u8a62\u6216\u7279\u5b9a\u5834\u666f\u4e0b\u5c24\u70ba\u91cd\u8981\uff0c\u56e0\u70ba\u9ed8\u8a8d\u7684\u512a\u5316\u7b56\u7565\u53ef\u80fd\u7121\u6cd5\u9054\u5230\u6700\u4f73\u6548\u679c\u3002<\/p>\n<h2 id=\"oceanbase-%e4%b8%ad%e7%9a%84-optimizer-hint-BnBzxcyRJI\">OceanBase \u4e2d\u7684 Optimizer Hint<\/h2>\n<p>\u5728 OceanBase \u4e2d\uff0cOptimizer Hint \u5141\u8a31\u7528\u6236\u5728 SQL \u67e5\u8a62\u4e2d\u5d4c\u5165\u7279\u5b9a\u7684\u63d0\u793a\uff0c\u4ee5\u6307\u5c0e\u512a\u5316\u5668\u9078\u64c7\u6700\u4f73\u7684\u57f7\u884c\u8a08\u5283\u3002\u9019\u4e9b\u63d0\u793a\u53ef\u4ee5\u7528\u4f86\u5f37\u5236\u4f7f\u7528\u7279\u5b9a\u7684\u7d22\u5f15\u3001\u6539\u8b8a\u806f\u63a5\u9806\u5e8f\u6216\u9078\u64c7\u7279\u5b9a\u7684\u67e5\u8a62\u7b56\u7565\u3002<\/p>\n<h3 id=\"%e5%b8%b8%e7%94%a8%e7%9a%84-optimizer-hint-BnBzxcyRJI\">\u5e38\u7528\u7684 Optimizer Hint<\/h3>\n<ul>\n<li><strong>USE INDEX<\/strong>: \u6307\u5b9a\u67e5\u8a62\u4f7f\u7528\u7279\u5b9a\u7684\u7d22\u5f15\u3002<\/li>\n<li><strong>FORCE INDEX<\/strong>: \u5f37\u5236\u67e5\u8a62\u4f7f\u7528\u6307\u5b9a\u7684\u7d22\u5f15\uff0c\u5373\u4f7f\u512a\u5316\u5668\u8a8d\u70ba\u5176\u4ed6\u7d22\u5f15\u66f4\u5408\u9069\u3002<\/li>\n<li><strong>JOIN_HINT<\/strong>: \u6307\u5b9a\u806f\u63a5\u7684\u9806\u5e8f\u6216\u65b9\u6cd5\uff0c\u4f8b\u5982\u4f7f\u7528\u5d4c\u5957\u5faa\u74b0\u806f\u63a5\u6216\u54c8\u5e0c\u806f\u63a5\u3002<\/li>\n<li><strong>NO_CACHE<\/strong>: \u6307\u793a\u512a\u5316\u5668\u4e0d\u4f7f\u7528\u67e5\u8a62\u7de9\u5b58\u3002<\/li>\n<\/ul>\n<h3 id=\"%e4%bd%bf%e7%94%a8%e7%a4%ba%e4%be%8b-BnBzxcyRJI\">\u4f7f\u7528\u793a\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 Optimizer Hint \u7684\u7c21\u55ae\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT \/*+ USE INDEX(idx_name) *\/ *\nFROM table_name\nWHERE column_name = 'value';<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u63d0\u793a\u544a\u8a34 OceanBase \u4f7f\u7528\u540d\u70ba <code>idx_name<\/code> \u7684\u7d22\u5f15\u4f86\u57f7\u884c\u67e5\u8a62\u3002\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u6548\u7387\uff0c\u7279\u5225\u662f\u5728\u6578\u64da\u91cf\u8f03\u5927\u7684\u60c5\u6cc1\u4e0b\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e9%81%b8%e6%93%87%e5%90%88%e9%81%a9%e7%9a%84-optimizer-hint-BnBzxcyRJI\">\u5982\u4f55\u9078\u64c7\u5408\u9069\u7684 Optimizer Hint<\/h2>\n<p>\u9078\u64c7\u5408\u9069\u7684 Optimizer Hint \u9700\u8981\u5c0d\u6578\u64da\u5eab\u7684\u7d50\u69cb\u548c\u67e5\u8a62\u7684\u7279\u6027\u6709\u6df1\u5165\u7684\u4e86\u89e3\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li>\u5206\u6790\u67e5\u8a62\u57f7\u884c\u8a08\u5283\uff1a\u4f7f\u7528 <code>EXPLAIN<\/code> \u8a9e\u53e5\u67e5\u770b\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u627e\u51fa\u6027\u80fd\u74f6\u9838\u3002<\/li>\n<li>\u6e2c\u8a66\u4e0d\u540c\u7684\u63d0\u793a\uff1a\u5728\u958b\u767c\u74b0\u5883\u4e2d\u6e2c\u8a66\u4e0d\u540c\u7684 Optimizer Hint\uff0c\u89c0\u5bdf\u5176\u5c0d\u67e5\u8a62\u6027\u80fd\u7684\u5f71\u97ff\u3002<\/li>\n<li>\u4fdd\u6301\u7c21\u6f54\uff1a\u904e\u591a\u7684\u63d0\u793a\u53ef\u80fd\u6703\u5c0e\u81f4\u67e5\u8a62\u8b8a\u5f97\u8907\u96dc\uff0c\u61c9\u8a72\u50c5\u5728\u5fc5\u8981\u6642\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-BnBzxcyRJI\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136 Optimizer Hint \u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u4f46\u4e0d\u7576\u4f7f\u7528\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u56e0\u6b64\uff0c\u5efa\u8b70\u5728\u4f7f\u7528\u63d0\u793a\u6642\u8b39\u614e\u8003\u616e\uff0c\u4e26\u5b9a\u671f\u6aa2\u67e5\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-BnBzxcyRJI\">\u7e3d\u7d50<\/h2>\n<p>OceanBase \u7684 Optimizer Hint \u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u512a\u5316\u67e5\u8a62\u6027\u80fd\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u9019\u4e9b\u63d0\u793a\uff0c\u7528\u6236\u53ef\u4ee5\u66f4\u597d\u5730\u63a7\u5236\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u5f9e\u800c\u63d0\u9ad8\u6574\u9ad4\u7cfb\u7d71\u7684\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6027\u80fd\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u4e86\u89e3\u548c\u638c\u63e1 Optimizer Hint \u7684\u4f7f\u7528\u5c07\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u7528\u6236\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u9084\u662f\u5176\u4ed6\u96f2\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn how to effectively use OceanBase Optimizer Hint in this comprehensive tutorial, enhancing query performance and database efficiency.<\/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-160195","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160195","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=160195"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160195\/revisions"}],"predecessor-version":[{"id":160196,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160195\/revisions\/160196"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160195"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160195"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160195"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}