Monday, January 4, 2010

More About CXPACKET Wait Stats

What is CXPACKET Wait Stats?
When Query executing in Parallel Operation then there are multiple threads for a single query. Each thread deals with a different set of data. Some threads finish fast and some threads finish slow then CXPACKET Wait Stats will create.

Threads which came first have to wait for slow threads to fnish, the wait by a finished thread is called CXPACKET Wait Stat.

All the CXPACKET wait types are bad. If you remove wait type for any query, then that query run slower because the parallel operations are disabled for that query or if you run entire query in a single CPU you will experienced very bad

How to Change MAXDOP at Server Level

EXEC SP_Configure N'max degree of parallelism', N'1'
GO
RECONFIGURE WITH OVERRIDE
GO

The best suggestion is set ‘the maximum degree of parallelism’ to a lower number or half the number of CPU's

NOTE: The server level setting Can be overwritten on a query level.



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