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WAIT_AT_LOW_PRIORITY Feature for DBCC SHRINKFILE in SQL Server 2022



SQL Server 2022 introduces a new feature called WAIT_AT_LOW_PRIORITY for the DBCC SHRINKFILE command. This feature allows the SHRINKFILE operation to wait for low-priority I/Os to complete before continuing with the shrink operation.

When you execute the DBCC SHRINKFILE command in SQL Server, it returns the unused space from a data file to the operating system. However, this operation can be resource-intensive and can cause performance issues for other processes running on the server. The WAIT_AT_LOW_PRIORITY option allows the SHRINKFILE operation to run at a lower priority and wait for low-priority I/Os to complete before continuing with the shrink operation.

The WAIT_AT_LOW_PRIORITY option can be specified as a parameter to the DBCC SHRINKFILE command in SQL Server 2022. For example:



DBCC SHRINKFILE (N'filename', 1024, WAIT_AT_LOW_PRIORITY)

In this example, the WAIT_AT_LOW_PRIORITY option is specified as the third parameter to the DBCC SHRINKFILE command. This tells SQL Server to wait for low-priority I/Os to complete before continuing with the shrink operation.

By using the WAIT_AT_LOW_PRIORITY option with the DBCC SHRINKFILE command, you can reduce the impact of the shrink operation on other processes running on the server and improve overall server performance.



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