Wait Type ASYNC_DISKPOOL_LOCK

Wait statistics, in the context of SQL Server, refer to the amount of time that a query spends waiting to access data in the database. When a client application requests data from the database, the request is placed in a queue and the client application must wait for its turn to access the data. The time that the query spends waiting is called a "wait" and is tracked by SQL Server. This information can be used to identify potential performance bottlenecks and optimize the performance of the database. Wait statistics are commonly used by database administrators to diagnose and troubleshoot performance issues in SQL Server.

In Microsoft SQL Server, a wait type is a type of event that occurs when a task has to wait for a resource or for an event to complete before it can continue processing. One of the wait types that can occur in SQL Server is ASYNC_DISKPOOL_LOCK.

The ASYNC_DISKPOOL_LOCK wait type occurs when a task is waiting to acquire a lock on an Asynchronous I/O Disk Pool (AiO DP) in SQL Server. An AiO DP is a collection of disks that are used to store data files for a database.

The ASYNC_DISKPOOL_LOCK wait type can occur for various reasons, such as when there are multiple tasks trying to access the same data file in the AiO DP simultaneously, or when there is an issue with the AiO DP itself. It can also occur if the database is heavily accessed and there are not enough resources available to complete the tasks in a timely manner.

It is important to monitor for the ASYNC_DISKPOOL_LOCK wait type, as it can indicate that there may be issues with the performance of the database or with the AiO DP. If this wait type occurs frequently or for a long duration, it can potentially impact the performance and availability of the database.

To resolve issues with the ASYNC_DISKPOOL_LOCK wait type, you may need to troubleshoot the cause of the issue and take appropriate action, such as optimizing the database or increasing the available resources. It is also important to ensure that the AiO DP is properly configured and that all disks in the AiO DP are functioning correctly. By monitoring for and addressing issues with the ASYNC_DISKPOOL_LOCK wait type, you can ensure that your database is performing optimally and that your data is accessible when needed.

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Applies to

Related Waits

See Also

• More About ASYNC_DISKPOOL_LOCK