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.