This is the official team Web Log for Microsoft Customer Service and Support (CSS) SQL Support. Posts are provided by the CSS SQL Escalation Services team.
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Trace flag 1118 forces uniform extent allocations instead of mixed page allocations. The trace flag is commonly used to assist in TEMPDB scalability by avoiding SGAM and other allocation contention points. SQL Server 2008 optimized mixed extent Read More...
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Many of you have encountered the RDTSC timing variances that I outlined in an earlier blog post: http://blogs.msdn.com/psssql/archive/2006/11/27/sql-server-2005-sp2-will-introduce-new-messages-to-the-error-log-related-to-timing-activities.aspx Read More...
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This post is more of a T-SQL trick and NOT a recommendation practice, but since I addressed this in a recent customer case I thought I would share it. Problem: Application needs to lock a row for the duration of the transaction and ensure no data Read More...
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The mistake I see people make is when looking at the SQL Server PAGE I/O waits and stalled I/O warnings is when comparing it to the Avg. Disk Seconds/Transfer. Everyone seems to forget that average means average and they look at the Read More...
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In the past couple of months, SQL Server support team has come across some customers running into performance issues attributed to TokenAndPermUserStore in SQL Server 2005. This blog post attempts to compile all the information we have so far regarding Read More...
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This issue is as old as SQL Server. In fact, it goes back to Sybase days but continues to fool and puzzle administrators. A session with that status of sleeping / awaiting command is simply a client connection with no active query to the SQL Server. Read More...
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SQL Server 2005 adds additional shrink logic to compress TEXT/IMAGE data, referred to as LOBs. The dbcc shrink* code uses the same underlying methods that ALTER INDEX .... WITH (LOB_COMPACTION ON) uses to compact the LOB space Read More...
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The question invoking the discussion was why did a query elect to use 100+ workers, approximately half the configured worker threads? Before erasing this topic from my whiteboard let me document the highlights. Often overlooked is the degree Read More...
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The Senior Escalation Engineers do various training and mentoring activities. As I do this I thought I would try to propagate some of this information on the blog. A customer asked: "Why does backup to disk choose a transfer size of 1MB but Read More...
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The Senior Escalation Engineers do various training and mentoring activities. As I do this I thought I would try to propagate some of this information on the blog. A customer asked: "Why does it take me 7 hours to backup my database but 21 Read More...
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I posted some updates to my blog entry about the RDTSC and drift warnings in May. See the following link http://blogs.msdn.com/psssql/archive/2006/11/27/sql-server-2005-sp2-will-introduce-new-messages-to-the-error-log-related-to-timing-activities.aspx Read More...
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The SQL Books Online states that using NUMA port affinity helps co-locate the resources used by the query (CPU, Memory, ….). This is true for serial plan execution but not completely the case for parallel query execution. You might assume that you can Read More...
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I spent several days last week investigating reported case trends and I will attempt to summarize the findings for you. The following message was added to SQL Server 2005 SP2 to indicate that the working set (RAM resident portion of SQL Server) was paged Read More...
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I have been answering questions on two of the most misunderstood ‘SQL Server Urban Legends’ frequently again so I decided to make a post about them. · SQL Server Uses One Thread Per Data Read More...
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I would like to make you aware of corrections you should apply to your 64 bit installations of SQL Server to avoid sluggish behavior. Microsoft has encountered reports from a few seconds up to minutes in duration where it appears SQL Server is not processing Read More...
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