{"id":2698,"date":"2013-06-02T06:21:49","date_gmt":"2013-06-02T06:21:49","guid":{"rendered":"http:\/\/enjoyasp.net\/?p=2698"},"modified":"2014-07-30T12:25:07","modified_gmt":"2014-07-30T12:25:07","slug":"nolock%e7%9a%84%e6%9b%bf%e6%8d%a2%e6%96%b9%e6%a1%88-%e6%8f%90%e4%ba%a4%e8%af%bb%e5%bf%ab%e7%85%a7%e9%9a%94%e7%a6%bb","status":"publish","type":"post","link":"https:\/\/enjoyasp.net\/index.php\/2013\/06\/02\/nolock%e7%9a%84%e6%9b%bf%e6%8d%a2%e6%96%b9%e6%a1%88-%e6%8f%90%e4%ba%a4%e8%af%bb%e5%bf%ab%e7%85%a7%e9%9a%94%e7%a6%bb\/","title":{"rendered":"nolock\u7684\u66ff\u4ee3\u65b9\u6848-\u63d0\u4ea4\u8bfb\u5feb\u7167\u9694\u79bb[\u884c\u7248\u672c\u63a7\u5236]"},"content":{"rendered":"<pre class=\"brush:sql;first-line:1;pad-line-numbers:true;highlight:null;collapse:false;\">\r\nwith(nolock)\u5e76\u610f\u5473\u7740\u6ca1\u6709\u9501\uff0c\u5b9e\u9645\u4e0a\u5728\u67e5\u8be2\u4e00\u5f20\u8868\u65f6\uff0c\u8fd8\u662f\u6709\u9501\uff0c\u4f1a\u5bf9\u5bf9\u8c61\u589e\u52a0\u67b6\u6784\u9501\uff0c\r\n\u9632\u6b62\u8868\u4f1a\u4fee\u6539\uff0c\u4f1a\u5bf9\u6570\u636e\u5e93\u589e\u52a0\u5171\u4eab\u9501\u3002\u82e5\u4f7f\u7528drop index,\u5219\u8981\u7b49\u5230\u67b6\u6784\u9501\u91ca\u653e\u3002\r\n\r\nsql server2005\u63d0\u4f9b\u4e86\u5feb\u7167\u9694\u79bb\u548c\u8bfb\u53d6\u5df2\u63d0\u4ea4\u5feb\u7167\u8fd9\u4e24\u79cd\u65b0\u7684\u4e0d\u52a0\u9501\u3001\u65e0\u963b\u585e\u7684\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\uff0c\u53ef\u4f7f\u7528\r\n\u5feb\u7167\uff1a\u6bcf\u6b21\u4ece\u6570\u636e\u8fdb\u884c\u4fee\u6539\u65f6\uff0c\u4f1a\u5728teampdb\u4e0a\u5b58\u50a8\u4e0a\u4e00\u7248\u672c\r\n\u597d\u5904\uff1a\r\nselect\u4e0d\u8981\u6c42\u9501\uff0c\u4f1a\u5927\u5927\u964d\u4f4e\u6574\u4e2a\u5e93\u7684\u9501\u8d1f\u8f7d\u91cf\r\nnolock\u4f1a\u8bfb\u53d6\u5230\u672a\u63d0\u4ea4\u4e8b\u52a1\u65f6\u4fee\u6539\u7684\u6570\u636e\uff0c\u800c\u8bfb\u5feb\u7167\u8bfb\u53d6\u7684\u662f\u4fee\u6539\u4e4b\u524d\u7684\u6570\u636e\uff0c\u6545nolock\u6613\u8bfb\u53d6\u5230\u810f\u6570\u636e\r\n\u8bfb\u5feb\u7167\u4e0enolock\u76f8\u540c\u7684\u5730\u65b9\u5728\u4e8e\u90fd\u4e0d\u52a0\u5171\u4eab\u9501\uff0c\u4f46\u90fd\u4f1a\u52a0\u5bf9\u8c61\u67b6\u6784\u9501\u4e0e\u6570\u636e\u5e93\u7684\u5171\u4eab\u9501\uff0c\u533a\u522b\u5728\u4e8e\uff0cnolock\u9700\u8981\r\n\u5728\u6bcf\u4e2asql\u8bed\u53e5\u540e\u52a0\uff0c\u800c\u8bfb\u5feb\u7167\u4e0d\u7528\uff0c\u5e76\u7528\u8bfb\u5feb\u7167\u4e0d\u4f1a\u8bfb\u5230\u672a\u63d0\u4ea4\u4e8b\u52a1\u7684\u6570\u636e\u3002\r\n\u884c\u7248\u672c\u63a7\u5236\uff1a\u5728\u4efb\u4f55\u4e00\u4e2a\u4fee\u6539\u4e4b\u524d\uff0c\u5148\u5bf9\u4fee\u6539\u524d\u7684\u7248\u672c\u505a\u4e00\u4e2a\u590d\u5236 \uff0c\u540e\u7eed\u7684\u4e00\u5207\u8bfb\u64cd\u4f5c\u90fd\u4f1a\u53bb\u8bfb\u8fd9\u4e2a\u590d\u5236\u7684\u7248\u672c\uff0c\u4fee\u6539\u5c06\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u7248\u672c\u3002\u5728\u8fd9\u79cd\u5904\u7406\u65b9\u5f0f\u4e0b\uff0c\u8bfb\u3001\u5199\u64cd\u4f5c\u4e0d\u4f1a\u76f8\u4e92\u963b\u585e\u3002\u4f7f\u7528\u8fd9\u79cd\u884c\u7248\u672c\u63a7\u5236\u673a\u5236\u7684\u597d\u5904\uff0c\u662f\u7a0b\u5e8f\u7684\u5e76\u53d1\u6027\u6bd4\u8f83\u9ad8\uff0c\u4f46\u662f\u7f3a\u70b9\u662f\u7528\u6237\u8bfb\u5230\u7684\u867d\u7136\u4e0d\u662f\u4e00\u4e2a\u810f\u6570\u636e\uff0c\u4f46\u662f\u53ef\u80fd\u662f\u4e2a\u6b63\u5728\u88ab\u4fee\u6539\u9a6c\u4e0a\u5c31\u8981\u8fc7\u671f\u7684\u6570\u636e\u503c\r\n\u3010\u6ce8\uff1a\u52a0\u4e0a\u884c\u7248\u672c\u63a7\u5236\u540e\uff0c\u4f1a\u6700\u5927\u9650\u5ea6\u964d\u4f4e\u6b7b\u9501\uff0c\u4f46\u4e0d\u662f\u6ca1\u6709\u6b7b\u9501\u3011\r\n\r\n\u76f8\u5173\u5b58\u50a8\u8fc7\u7a0b\uff1aselect * from sys.dm_tran_version_store\r\n\r\n\r\n\u628aSQL Server\u6570\u636e\u5e93\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u8bbe\u7f6e\u4e3a\u5df2\u63d0\u4ea4\u8bfb\u5feb\u7167\u9694\u79bb\uff1a\r\n\u5982\u679c\u76f4\u63a5\u8fd0\u884c\u4e0b\u9762\u7684\u8bed\u53e5\uff1a\r\nALTER Database [mydbname] SET READ_COMMITTED_SNAPSHOT ON\r\n\u4f1a\u53ef\u80fd\u88ab\u963b\u585e\u5f88\u957f\u65f6\u95f4\u3002\r\n\u4f60\u53ef\u4ee5\u9009\u62e9\u8fd0\u884c\u4e0b\u9762\u7684\u8bed\u53e5\uff1a\r\nif(charindex(&#39;Microsoft SQL Server 2005&#39;,@@version) &gt; 0)\r\nbegin\r\ndeclare @sql varchar(8000)\r\nselect @sql = &#39;\r\nALTER DATABASE &#39; + DB_NAME() + &#39; SET SINGLE_USER WITH ROLLBACK IMMEDIATE ;\r\nALTER DATABASE &#39; + DB_NAME() + &#39; SET READ_COMMITTED_SNAPSHOT ON;\r\nALTER DATABASE &#39; + DB_NAME() + &#39; SET MULTI_USER;&#39;\r\nExec(@sql)\r\nend\r\n\u901a\u8fc7\u67e5\u8be2 sys.databases\u7684 is_read_committed_snapshot_on\u5b57\u6bb5\r\nselect is_read_committed_snapshot_on from sys.databases where name = DB_Name()\r\nis_read_committed_snapshot_on\u5982\u679c\u4e3a1\u8868\u793a\u76ee\u524d\u4e3a\u5df2\u63d0\u4ea4\u8bfb\u5feb\u7167\u9694\u79bb\u7ea7\u522b\r\n\r\n\u5f15\u7528\uff1a\r\n7 Things Developers Should Know About SQL Server\r\nUsing Read-Committed Snapshot Isolation - Mini-Lab\r\nSQL Server\u5df2\u63d0\u4ea4\u8bfb\u5feb\u7167\u9694\u79bb\u7ea7\u522b\u7684\u8bbe\u7f6e\r\nSQL Server 2005\u4f7f\u7528\u57fa\u4e8e\u884c\u7248\u672c\u63a7\u5236\u7684\u9694\u79bb\u7ea7\u522b\u521d\u63a2\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>with(nolock)\u5e76\u610f\u5473\u7740\u6ca1\u6709\u9501\uff0c\u5b9e\u9645\u4e0a\u5728\u67e5\u8be2\u4e00\u5f20\u8868\u65f6\uff0c\u8fd8\u662f\u6709\u9501\uff0c\u4f1a\u5bf9\u5bf9\u8c61\u589e\u52a0\u67b6\u6784\u9501\uff0c \u9632\u6b62\u8868\u4f1a\u4fee\u6539\uff0c\u4f1a [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[],"class_list":["post-2698","post","type-post","status-publish","format-standard","hentry","category-sql-server"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts\/2698","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/comments?post=2698"}],"version-history":[{"count":0,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts\/2698\/revisions"}],"wp:attachment":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/media?parent=2698"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/categories?post=2698"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/tags?post=2698"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}