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DIRTY_PAGE_POLL and how to avoid it
07 March,2014 by Tom Collins
Question: Is the DIRTY_PAGE_POLL wait type something to worry about? Since I’ve upgraded to SQL Server 2012 , I’ve noticed the DIRTY_PAGE_POLL consistently appearing at the top of the wait types.
Answer: The DIRTY_PAGE_POLL wait type is related to the Indirect Checkpoint feature. One of the Indirect Checkpoint benefits is to reduce IO spiking that is checkpoint-related by writing dirty pages continually to disk in the background.
By default, Indirect Checkpoint is not turned on , and requires an ALTER DATABASE statement to enable.
The interesting aspect of DIRTY_PAGE_POLL wait type , is it still appears as a wait type, even though Indirect Checkpoint is not enabled, as the background thread is waiting to poll for dirty pages.
In reporting the top wait types on a database server, I don’t include DIRTY_PAGE_POLL as it changes the top waits report without giving me a better understanding of SQL Server performance.
Read More
SQL Server Performance Killers
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SQL Server – Memory: Pages sec, memory pressure and thrashing
Author: Tom Collins (http://www.sqlserver-dba.com)
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