In this article we will go over basic understanding of Rollup clause in SQL Server. ROLLUP clause is used to do aggregate operation on multiple levels in hierarchy. Let us understand how it works by using an example.
Data Mining Algorithms (Analysis Services – Data Mining)
I quite often receive requests for the Data Mining Algorithms details. Book Online has wonderful resources for the same. I suggest to read them here.
SQLAuthority News – Blog Subscription and Comments RSS
Quite often I get email where many readers ask me how to get email from SQLAuthority.com blog. Today very quickly I will go over few standard practices of this blog using you can stay connected with SQLAuthority.com First the most important is search: I received hundreds of emails and hundreds…
Read MoreSQL SERVER- IF EXISTS(Select null from table) vs IF EXISTS(Select 1 from table)
Few days ago I wrote article about SQL SERVER – Stored Procedure Optimization Tips – Best Practices. I received lots of comments on particular blog article. In fact, almost all the comments are very interesting. If you have not read all the comments, I strongly suggest to read them. Click…
Read MoreSQL SERVER – Recompile Stored Procedure at Run Time
I recently received an email from reader after reading my previous article on SQL SERVER – Plan Recompilation and Reduce Recompilation – Performance Tuning regarding how to recompile any stored procedure at run time. There are multiple ways to do this. If you want your stored procedure to always recompile at run time, you can add the keyword RECOMPILE when you create the stored procedure. Additionally, if the stored procedure has to be recompiled at only one time, in that case, you can add RECOMPILE word one time only and run the SP as well. Let us go over these two options.
SQLAuthority News – Microsoft SQL Server Migration Assistant 2008 for MySQL v1.0 CTP1
Microsoft SQL Server Migration Assistant (SSMA) 2008 is a toolkit that dramatically cuts the effort, cost, and risk of migrating from MySQL to SQL Server 2008 and SQL Azure. SSMA 2008 for MySQL v1.0 CTP1 provides an assessment of migration efforts as well as automates schema and data migration. Download…
Read MoreSQL SERVER – Plan Recompilation and Reduce Recompilation – Performance Tuning
Recompilation process is same as compilation and degrades server performance. In SQL Server 2000 and earlier versions, this was a serious issue but in SQL server 2005, the severity of this issue has been significantly reduced by introducing a new feature called Statement-level recompilation. When SQL Server 2005 recompiles stored…
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