Contents
What is wait type Cxpacket in SQL Server?
The SQL Server CXPACKET wait type is a result of parallel query execution and indicates that a session is waiting for the synchronization of threads involved in the parallel process to complete.
How wait types can effect the performance of SQL Server?
When a query encounters something that is not available, SQL Server sets wait type for that wait reason. This data is retained in SQL Dynamic Views which we can use to understand why things are slower than expected.
How to reduce cxpacket wait type in SQL Server?
From wait type I can see CXPACKET is on the top based on the following SQL Server metrics, should I reduce MAXDOP or “cost Threshold for Parallelism” to avoid more parallelism and reduce CXPACKET wait type? Any help would be appreciated. General consensus seems to tend torwards setting Cost Threshold for Parallelism to 50 and go from there.
What does cxpacket and cxconsumer mean in SQL Server?
CXPACKET and CXCONSUMER are wait types that indicate that work isn’t equally balanced. When you see these wait stats on your server, you’ll know that SQL Server is running queries in parallel, but not doing a great job of distributing them across available processors.
Is there a performance issue with SQL Server?
I have a performance issue with production SQL Server 2012 which has 24 cores and 32 GB of RAM. From wait type I can see CXPACKET is on the top based on the following SQL Server metrics, should I reduce MAXDOP or “cost Threshold for Parallelism” to avoid more parallelism and reduce CXPACKET wait type? Any help would be appreciated.
How to fix excessive cxpacket and cxconsumer wait types?
The CXPACKET wait stats were lower which meant that the load was more evenly balanced across more cores than before. Brent recommends the following steps if you are seeing excessive CXPACKET and CXCONSUMER wait statistics: Set the CTFP and MAXDOP per industry best practices and then let those settings bake for a few days.