CXPACKET

This is a common wait that occurs when a parallel query is executing. During parallel processing, SQL Server breaks down queries into separate parts that can be processed simultaneously using multiple threads. Each thread works on a separate piece of data so that queries can be processed more quickly and efficiently. If work is not split equally between threads, those with fewer rows to process must wait until long-running threads complete. CXPACKET is the total time in milliseconds of all threads waiting to process data.

CXPACKET waits can occur for different reasons in various environments, and you’ll need to find the root cause before deciding whether or not a problem exists. For example, In large-scale data warehousing or OLAP (Online Analytical Processing) environments with multiple processors and frequent parallel executions, a high CXPACKET wait is expected behavior and is not necessarily an issue. In an OLTP (Online Transaction Processing) with small transactions and short queries, excessive CXPACKET waits may affect throughput of other OLTP traffic.

Investigate queries

Investigate system settings

Note: You should only make system changes if you’ve already investigated queries, and you understand the potential impact in your environment. 


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