摘要： Same:1. Both clustered and nonclustered indexes can be made up of more than one column.2. Both clustered indexes, and nonclustered indexes take up additional disk space.3. Adding indexes (both clustered and nonclusterd) will increase the amount of time that your INSERT, UPDATE and DELETE statement t 阅读全文

摘要： 1. Create and delete clustered indexDrop Index PerformanceIssue.UNC_PRIDCREATE UNIQUE NONCLUSTERED INDEX UNC_PRID ON PerformanceIssue (PRID)CREATE UNIQUE CLUSTERED INDEX UC_PRCode ON PerformanceIssue(PRCode)2. Refer to http://www.blogjava.net/jiabao/archive/2008/04/08/191595.html2.1 【Table Scan】 打开执 阅读全文

摘要： 1. In technical terms, a table without an index is called a “heap”.2. Common functions.select db_id(N'Product'); -- Get DB idselect object_id('test.dbo.PerformanceIssue') -- Get Table idselect * from sysobjects where id= object_id('PerformanceIssue') and type = 'U' -- 阅读全文

摘要： <script type="text/javascript"> $(document).ready(function () { $("#validimg").click(function () { $("#validimg").attr('src', '@Url.Content("~/Home/GenerateImage?")' + Math.random()); }); }) </script> <div> <img alt="验 阅读全文