{"id":93934,"date":"2024-10-19T18:08:17","date_gmt":"2024-10-19T10:08:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/93934\/"},"modified":"2024-10-19T18:08:18","modified_gmt":"2024-10-19T10:08:18","slug":"oracle-hint%e7%9a%84%e5%b8%b8%e7%94%a8%e7%94%a8%e6%b3%95%e5%9c%a8sql%e5%84%aa%e5%8c%96%e9%81%8e%e7%a8%8b%e4%b8%ad","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/93934\/","title":{"rendered":"Oracle HINT\u7684\u5e38\u7528\u7528\u6cd5\u5728SQL\u512a\u5316\u904e\u7a0b\u4e2d"},"content":{"rendered":"<h1 id=\"oracle-hint%e7%9a%84%e5%b8%b8%e7%94%a8%e7%94%a8%e6%b3%95%e5%9c%a8sql%e5%84%aa%e5%8c%96%e9%81%8e%e7%a8%8b%e4%b8%ad-KxNSBbqUzt\">Oracle HINT\u7684\u5e38\u7528\u7528\u6cd5\u5728SQL\u512a\u5316\u904e\u7a0b\u4e2d<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cSQL\u67e5\u8a62\u7684\u6027\u80fd\u512a\u5316\u662f\u4e00\u500b\u81f3\u95dc\u91cd\u8981\u7684\u8ab2\u984c\u3002Oracle\u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u4e00\u7a2e\u540d\u70baHINT\u7684\u529f\u80fd\uff0c\u5141\u8a31\u958b\u767c\u8005\u5728\u67e5\u8a62\u4e2d\u63d0\u4f9b\u6307\u5c0e\uff0c\u4ee5\u5e6b\u52a9\u512a\u5316\u5668\u9078\u64c7\u6700\u4f73\u7684\u57f7\u884c\u8a08\u5283\u3002\u672c\u6587\u5c07\u63a2\u8a0eOracle HINT\u7684\u5e38\u7528\u7528\u6cd5\u53ca\u5176\u5728SQL\u512a\u5316\u904e\u7a0b\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%aforacle-hint%ef%bc%9f-KxNSBbqUzt\">\u4ec0\u9ebc\u662fOracle HINT\uff1f<\/h2>\n<p>Oracle HINT\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u8a3b\u89e3\uff0c\u901a\u904e\u5728SQL\u67e5\u8a62\u4e2d\u6dfb\u52a0HINT\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5f71\u97ff\u67e5\u8a62\u512a\u5316\u5668\u7684\u884c\u70ba\u3002\u9019\u4e9bHINT\u4e0d\u6703\u6539\u8b8a\u67e5\u8a62\u7684\u7d50\u679c\uff0c\u4f46\u53ef\u4ee5\u6539\u8b8a\u67e5\u8a62\u7684\u57f7\u884c\u65b9\u5f0f\uff0c\u5f9e\u800c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<h2 id=\"hint%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-KxNSBbqUzt\">HINT\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>HINT\u901a\u5e38\u4ee5\u6ce8\u91cb\u7684\u5f62\u5f0f\u51fa\u73fe\u5728SQL\u8a9e\u53e5\u4e2d\uff0c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT \/*+ HINT_NAME *\/ column1, column2\nFROM table_name\nWHERE condition;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0cHINT_NAME\u662f\u5177\u9ad4\u7684HINT\u540d\u7a31\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6839\u64da\u9700\u8981\u9078\u64c7\u5408\u9069\u7684HINT\u3002<\/p>\n<h2 id=\"%e5%b8%b8%e7%94%a8%e7%9a%84hint%e9%a1%9e%e5%9e%8b-KxNSBbqUzt\">\u5e38\u7528\u7684HINT\u985e\u578b<\/h2>\n<ul>\n<li><strong>INDEX HINT<\/strong>: \u6307\u5b9a\u4f7f\u7528\u7279\u5b9a\u7684\u7d22\u5f15\u3002<\/li>\n<pre><code>SELECT \/*+ INDEX(table_name index_name) *\/ *\nFROM table_name;<\/code><\/pre>\n<li><strong>FULL HINT<\/strong>: \u6307\u5b9a\u4f7f\u7528\u5168\u8868\u6383\u63cf\u3002<\/li>\n<pre><code>SELECT \/*+ FULL(table_name) *\/ *\nFROM table_name;<\/code><\/pre>\n<li><strong>LEADING HINT<\/strong>: \u6307\u5b9a\u67e5\u8a62\u4e2d\u8868\u7684\u806f\u63a5\u9806\u5e8f\u3002<\/li>\n<pre><code>SELECT \/*+ LEADING(table1 table2) *\/ *\nFROM table1, table2\nWHERE table1.id = table2.id;<\/code><\/pre>\n<li><strong>USE_NL HINT<\/strong>: \u6307\u5b9a\u4f7f\u7528\u5d4c\u5957\u5faa\u74b0\u806f\u63a5\u3002<\/li>\n<pre><code>SELECT \/*+ USE_NL(table1 table2) *\/ *\nFROM table1, table2\nWHERE table1.id = table2.id;<\/code><\/pre>\n<\/ul>\n<h2 id=\"hint%e7%9a%84%e4%bd%bf%e7%94%a8%e5%a0%b4%e6%99%af-KxNSBbqUzt\">HINT\u7684\u4f7f\u7528\u5834\u666f<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0cOracle\u7684\u81ea\u52d5\u512a\u5316\u5668\u53ef\u80fd\u7121\u6cd5\u9078\u64c7\u6700\u4f73\u7684\u57f7\u884c\u8a08\u5283\u3002\u9019\u6642\uff0c\u4f7f\u7528HINT\u53ef\u4ee5\u5e6b\u52a9\u512a\u5316\u67e5\u8a62\u6027\u80fd\u3002\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u7576\u67e5\u8a62\u6d89\u53ca\u591a\u500b\u8868\u7684\u806f\u63a5\u6642\uff0c\u4f7f\u7528LEADING HINT\u53ef\u4ee5\u660e\u78ba\u6307\u5b9a\u806f\u63a5\u7684\u9806\u5e8f\uff0c\u5f9e\u800c\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528INDEX HINT\u53ef\u4ee5\u5f37\u5236\u67e5\u8a62\u4f7f\u7528\u7279\u5b9a\u7684\u7d22\u5f15\uff0c\u907f\u514d\u5168\u8868\u6383\u63cf\u3002<\/li>\n<li>\u5c0d\u65bc\u5927\u578b\u6578\u64da\u96c6\uff0c\u4f7f\u7528FULL HINT\u53ef\u4ee5\u5f37\u5236\u57f7\u884c\u5168\u8868\u6383\u63cf\uff0c\u9019\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u53ef\u80fd\u6bd4\u4f7f\u7528\u7d22\u5f15\u66f4\u6709\u6548\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-KxNSBbqUzt\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136HINT\u53ef\u4ee5\u5e6b\u52a9\u512a\u5316\u67e5\u8a62\u6027\u80fd\uff0c\u4f46\u904e\u5ea6\u4f9d\u8cf4HINT\u53ef\u80fd\u6703\u5c0e\u81f4\u7dad\u8b77\u56f0\u96e3\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528HINT\u7684\u6ce8\u610f\u4e8b\u9805\uff1a<\/p>\n<ul>\n<li>\u5728\u4f7f\u7528HINT\u4e4b\u524d\uff0c\u61c9\u5148\u9032\u884c\u6027\u80fd\u6e2c\u8a66\uff0c\u78ba\u4fddHINT\u7684\u4f7f\u7528\u80fd\u5920\u5e36\u4f86\u5be6\u969b\u7684\u6027\u80fd\u63d0\u5347\u3002<\/li>\n<li>\u96a8\u8457\u6578\u64da\u91cf\u7684\u8b8a\u5316\uff0c\u6700\u4f73\u7684\u57f7\u884c\u8a08\u5283\u53ef\u80fd\u6703\u6539\u8b8a\uff0c\u56e0\u6b64\u9700\u8981\u5b9a\u671f\u6aa2\u67e5\u548c\u8abf\u6574HINT\u7684\u4f7f\u7528\u3002<\/li>\n<li>\u904e\u5ea6\u4f7f\u7528HINT\u53ef\u80fd\u6703\u4f7f\u67e5\u8a62\u8b8a\u5f97\u96e3\u4ee5\u7406\u89e3\u548c\u7dad\u8b77\uff0c\u56e0\u6b64\u61c9\u8b39\u614e\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-KxNSBbqUzt\">\u7e3d\u7d50<\/h2>\n<p>Oracle HINT\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5728SQL\u512a\u5316\u904e\u7a0b\u4e2d\u5f71\u97ff\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528HINT\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u9762\u5c0d\u8907\u96dc\u67e5\u8a62\u6642\u3002\u7136\u800c\uff0c\u4f7f\u7528HINT\u6642\u9700\u8b39\u614e\uff0c\u4ee5\u907f\u514d\u672a\u4f86\u7684\u7dad\u8b77\u554f\u984c\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u80fd\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u7a69\u5b9a\u6027\u548c\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle HINT\u5728SQL\u512a\u5316\u4e2d\u7684\u5e38\u7528\u7528\u6cd5\uff0c\u63d0\u5347\u67e5\u8a62\u6027\u80fd\uff0c\u512a\u5316\u6578\u64da\u5eab\u6548\u7387\uff0c\u5be6\u73fe\u66f4\u5feb\u7684\u6578\u64da\u8655\u7406\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-93934","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/93934","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=93934"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/93934\/revisions"}],"predecessor-version":[{"id":93935,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/93934\/revisions\/93935"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=93934"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=93934"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=93934"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}