若删除了表中的聚集索引会怎样?
注:此文源自http://www.sqlmag.com/blogs/sql-server-questions-answered/sql-server-questions-answered/tabid/1977/entryid/12748/Default.aspx。问题: 经常谈到聚集索引就是“数据”,但是并不完...
重建索引与更新统计
书籍下载:SQL Server分布统计
SQL Server 分布统计是Holger Schmeling首次在Simple-Talk上发布的一本性能优化手册,本手册以易懂的实际例子阐述了那些不容易解决或理解的问题。分布统计对象是表内数据分布的范例图,它有助于查询优化器将“逻辑...
对比:重建索引与更新统计
最近经常被问到的一个问题是关于在数据库维护过程,重建索引与更新统计的执行先后次序。通常,需要考虑以下几点,这里注意的是有两种统计:索引统计、列统计。1)默认情况下,UPDATE STATISTICS 将会更新索引统计...
SQL Server 2005 & 2008 SP Release Dates
Microsoft has announced that Service Pack 2 for SQL Server 2008 will be released in the third quarter of 2010, and that Service Pack 4 for SQL Server 2005 will be released in the fourth quarter of 201...
An Example of User-Defined Database Roles
To demo the power of a user-defined database role,let's look at a simple example.Let's say that you have a group of users who need to read all the tables in a database butshould be granted access to u...