{"id":141122,"date":"2024-10-31T21:21:20","date_gmt":"2024-10-31T13:21:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/141122\/"},"modified":"2024-10-31T21:21:21","modified_gmt":"2024-10-31T13:21:21","slug":"sql-server-%e9%ab%92%e8%ae%80%e6%96%b9%e5%bc%8f%e6%95%b8%e6%93%9a%e6%8f%90%e5%8f%96-nolock-%e5%92%8c-readpast","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/141122\/","title":{"rendered":"SQL Server \u9ad2\u8b80\u65b9\u5f0f\u6578\u64da\u63d0\u53d6&#8211;NOLOCK \u548c READPAST"},"content":{"rendered":"<h1 id=\"sql-server-%e9%ab%92%e8%ae%80%e6%96%b9%e5%bc%8f%e6%95%b8%e6%93%9a%e6%8f%90%e5%8f%96-nolock-%e5%92%8c-readpast-wwVjJZgsqc\">SQL Server \u9ad2\u8b80\u65b9\u5f0f\u6578\u64da\u63d0\u53d6&#8211;NOLOCK \u548c READPAST<\/h1>\n<p>\u5728 SQL Server \u4e2d\uff0c\u6578\u64da\u7684\u63d0\u53d6\u904e\u7a0b\u4e2d\u53ef\u80fd\u6703\u9047\u5230\u9ad2\u8b80\uff08Dirty Read\uff09\u554f\u984c\u3002\u9ad2\u8b80\u662f\u6307\u4e00\u500b\u4e8b\u52d9\u8b80\u53d6\u4e86\u53e6\u4e00\u500b\u4e8b\u52d9\u5c1a\u672a\u63d0\u4ea4\u7684\u6578\u64da\uff0c\u9019\u53ef\u80fd\u5c0e\u81f4\u4e0d\u4e00\u81f4\u7684\u7d50\u679c\u3002\u70ba\u4e86\u907f\u514d\u9019\u7a2e\u60c5\u6cc1\uff0cSQL Server \u63d0\u4f9b\u4e86\u5e7e\u7a2e\u4e0d\u540c\u7684\u9396\u5b9a\u63d0\u793a\uff0c\u5176\u4e2d\u6700\u5e38\u7528\u7684\u5169\u7a2e\u662f NOLOCK \u548c READPAST\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u5169\u7a2e\u65b9\u6cd5\u7684\u7279\u9ede\u3001\u4f7f\u7528\u60c5\u5883\u53ca\u5176\u512a\u7f3a\u9ede\u3002<\/p>\n<h2 id=\"nolock-wwVjJZgsqc\">NOLOCK<\/h2>\n<p>NOLOCK \u662f\u4e00\u7a2e\u5141\u8a31\u67e5\u8a62\u5728\u4e0d\u7372\u53d6\u9396\u7684\u60c5\u6cc1\u4e0b\u8b80\u53d6\u6578\u64da\u7684\u63d0\u793a\u3002\u9019\u610f\u5473\u8457\u67e5\u8a62\u53ef\u4ee5\u8b80\u53d6\u5176\u4ed6\u4e8b\u52d9\u6b63\u5728\u8655\u7406\u7684\u6578\u64da\uff0c\u800c\u4e0d\u6703\u88ab\u9396\u5b9a\u3002\u4f7f\u7528 NOLOCK \u7684\u67e5\u8a62\u4e0d\u6703\u963b\u585e\u5176\u4ed6\u4e8b\u52d9\uff0c\u4e5f\u4e0d\u6703\u88ab\u5176\u4ed6\u4e8b\u52d9\u963b\u585e\uff0c\u9019\u5728\u9ad8\u4f75\u767c\u74b0\u5883\u4e2d\u975e\u5e38\u6709\u7528\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-wwVjJZgsqc\">\u4f7f\u7528\u7bc4\u4f8b<\/h3>\n<pre><code>SELECT * FROM YourTable WITH (NOLOCK)<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u67e5\u8a62\u5c07\u5f9e YourTable \u4e2d\u63d0\u53d6\u6578\u64da\uff0c\u800c\u4e0d\u6703\u7372\u53d6\u4efb\u4f55\u9396\u3002\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u6027\u80fd\uff0c\u4f46\u4e5f\u53ef\u80fd\u5c0e\u81f4\u9ad2\u8b80\u7684\u98a8\u96aa\u3002<\/p>\n<h3 id=\"%e5%84%aa%e7%bc%ba%e9%bb%9e-wwVjJZgsqc\">\u512a\u7f3a\u9ede<\/h3>\n<ul>\n<li><strong>\u512a\u9ede\uff1a<\/strong>\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u6e1b\u5c11\u9396\u5b9a\u7af6\u722d\u3002<\/li>\n<li><strong>\u7f3a\u9ede\uff1a<\/strong>\u53ef\u80fd\u8b80\u53d6\u5230\u672a\u63d0\u4ea4\u7684\u6578\u64da\uff0c\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u3002<\/li>\n<\/ul>\n<h2 id=\"readpast-wwVjJZgsqc\">READPAST<\/h2>\n<p>READPAST \u662f\u53e6\u4e00\u7a2e\u9396\u5b9a\u63d0\u793a\uff0c\u5b83\u5141\u8a31\u67e5\u8a62\u8df3\u904e\u88ab\u5176\u4ed6\u4e8b\u52d9\u9396\u5b9a\u7684\u884c\u3002\u9019\u610f\u5473\u8457\u5982\u679c\u67d0\u4e00\u884c\u6b63\u5728\u88ab\u5176\u4ed6\u4e8b\u52d9\u8655\u7406\uff0cREADPAST \u5c07\u4e0d\u6703\u8b80\u53d6\u8a72\u884c\uff0c\u800c\u662f\u76f4\u63a5\u8df3\u904e\u5b83\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-wwVjJZgsqc\">\u4f7f\u7528\u7bc4\u4f8b<\/h3>\n<pre><code>SELECT * FROM YourTable WITH (READPAST)<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u67e5\u8a62\u5c07\u5f9e YourTable \u4e2d\u63d0\u53d6\u6578\u64da\uff0c\u4f46\u5982\u679c\u67d0\u4e00\u884c\u88ab\u9396\u5b9a\uff0c\u8a72\u884c\u5c07\u88ab\u8df3\u904e\uff0c\u67e5\u8a62\u5c07\u7e7c\u7e8c\u8655\u7406\u5176\u4ed6\u884c\u3002<\/p>\n<h3 id=\"%e5%84%aa%e7%bc%ba%e9%bb%9e-wwVjJZgsqc\">\u512a\u7f3a\u9ede<\/h3>\n<ul>\n<li><strong>\u512a\u9ede\uff1a<\/strong>\u907f\u514d\u9ad2\u8b80\uff0c\u78ba\u4fdd\u8b80\u53d6\u5230\u7684\u6578\u64da\u662f\u5df2\u63d0\u4ea4\u7684\u3002<\/li>\n<li><strong>\u7f3a\u9ede\uff1a<\/strong>\u53ef\u80fd\u5c0e\u81f4\u67e5\u8a62\u7d50\u679c\u4e0d\u5b8c\u6574\uff0c\u7279\u5225\u662f\u5728\u9ad8\u4f75\u767c\u74b0\u5883\u4e2d\u3002<\/li>\n<\/ul>\n<h2 id=\"nolock-%e8%88%87-readpast-%e7%9a%84%e6%af%94%e8%bc%83-wwVjJZgsqc\">NOLOCK \u8207 READPAST \u7684\u6bd4\u8f03<\/h2>\n<p>NOLOCK \u548c READPAST \u90fd\u662f\u70ba\u4e86\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u800c\u8a2d\u8a08\u7684\uff0c\u4f46\u5b83\u5011\u7684\u5de5\u4f5c\u539f\u7406\u548c\u9069\u7528\u60c5\u5883\u6709\u6240\u4e0d\u540c\u3002NOLOCK \u5141\u8a31\u8b80\u53d6\u672a\u63d0\u4ea4\u7684\u6578\u64da\uff0c\u9019\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u53ef\u80fd\u662f\u6709\u7528\u7684\uff0c\u4f46\u4e5f\u5e36\u4f86\u4e86\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u98a8\u96aa\u3002\u800c READPAST \u5247\u78ba\u4fdd\u53ea\u8b80\u53d6\u5df2\u63d0\u4ea4\u7684\u6578\u64da\uff0c\u96d6\u7136\u9019\u53ef\u80fd\u5c0e\u81f4\u67e5\u8a62\u7d50\u679c\u4e0d\u5b8c\u6574\u3002<\/p>\n<h3 id=\"%e9%81%b8%e6%93%87%e5%90%88%e9%81%a9%e7%9a%84%e6%8f%90%e7%a4%ba-wwVjJZgsqc\">\u9078\u64c7\u5408\u9069\u7684\u63d0\u793a<\/h3>\n<p>\u5728\u9078\u64c7\u4f7f\u7528 NOLOCK \u6216 READPAST \u6642\uff0c\u958b\u767c\u8005\u9700\u8981\u6839\u64da\u5177\u9ad4\u7684\u696d\u52d9\u9700\u6c42\u548c\u6578\u64da\u4e00\u81f4\u6027\u8981\u6c42\u4f86\u505a\u51fa\u6c7a\u7b56\u3002\u5982\u679c\u7cfb\u7d71\u5c0d\u6578\u64da\u4e00\u81f4\u6027\u8981\u6c42\u8f03\u9ad8\uff0c\u5247\u61c9\u512a\u5148\u8003\u616e\u4f7f\u7528 READPAST\uff1b\u5982\u679c\u7cfb\u7d71\u9700\u8981\u9ad8\u6027\u80fd\u4e14\u53ef\u4ee5\u5bb9\u5fcd\u9ad2\u8b80\uff0c\u5247\u53ef\u4ee5\u8003\u616e\u4f7f\u7528 NOLOCK\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-wwVjJZgsqc\">\u7e3d\u7d50<\/h2>\n<p>\u5728 SQL Server \u4e2d\uff0cNOLOCK \u548c READPAST \u662f\u5169\u7a2e\u5e38\u7528\u7684\u9ad2\u8b80\u65b9\u5f0f\u6578\u64da\u63d0\u53d6\u65b9\u6cd5\u3002NOLOCK \u63d0\u4f9b\u4e86\u66f4\u9ad8\u7684\u67e5\u8a62\u6027\u80fd\uff0c\u4f46\u53ef\u80fd\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\uff1b\u800c READPAST \u5247\u78ba\u4fdd\u8b80\u53d6\u5230\u7684\u6578\u64da\u662f\u5df2\u63d0\u4ea4\u7684\uff0c\u4f46\u53ef\u80fd\u6703\u5c0e\u81f4\u67e5\u8a62\u7d50\u679c\u4e0d\u5b8c\u6574\u3002\u6839\u64da\u5177\u9ad4\u7684\u696d\u52d9\u9700\u6c42\uff0c\u9078\u64c7\u5408\u9069\u7684\u9396\u5b9a\u63d0\u793a\u662f\u81f3\u95dc\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 <a href=\"https:\/\/server.hk\">\u4e91\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u53ef\u9760\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3 SQL Server \u4e2d\u7684\u9ad2\u8b80\u65b9\u5f0f\u6578\u64da\u63d0\u53d6\uff0c\u63a2\u7d22 NOLOCK \u548c READPAST \u7684\u4f7f\u7528\u53ca\u5176\u5c0d\u6578\u64da\u4e00\u81f4\u6027\u7684\u5f71\u97ff\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-141122","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141122","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=141122"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141122\/revisions"}],"predecessor-version":[{"id":141123,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141122\/revisions\/141123"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=141122"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=141122"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=141122"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}