Wait Type PREEMPTIVE_OS_SQLCLROPS

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.

A PREEMPTIVE_OS_SQLCLROPS wait type in SQL Server occurs when a process is waiting for a SQL Server Common Language Runtime (CLR) operation to complete.

SQL Server CLR allows you to write stored procedures, triggers, and functions in managed code (e.g. C# or VB.NET) and run them within the SQL Server process. These managed code objects are called SQL CLR objects.

When a process calls a SQL CLR object, it may have to wait for the operation to complete if the object is busy with another task. This can result in a PREEMPTIVE_OS_SQLCLROPS wait type.

There are a few potential causes for PREEMPTIVE_OS_SQLCLROPS wait types:

Long-running CLR operations: If a SQL CLR object takes a long time to complete its operation, it may cause a PREEMPTIVE_OS_SQLCLROPS wait type as other processes wait for it to finish.

Contention for resources: If multiple processes are trying to access the same resource simultaneously through SQL CLR objects, it may result in a PREEMPTIVE_OS_SQLCLROPS wait type as they all try to complete their operations.

Insufficient resources: If the system does not have enough resources (e.g. memory, CPU, etc.), it may take longer for a SQL CLR object to complete its operation and result in a PREEMPTIVE_OS_SQLCLROPS wait type.

To troubleshoot PREEMPTIVE_OS_SQLCLROPS wait types, you can use the SQL Server Profiler tool to identify the cause of the wait type and take appropriate action to resolve it. This may involve optimizing the CLR objects code, increasing system resources, or modifying the application logic to avoid contention for resources.

In summary, a PREEMPTIVE_OS_SQLCLROPS wait type in SQL Server indicates that a process is waiting for a SQL CLR operation to complete. It can be caused by long-running CLR operations, contention for resources, or insufficient resources, and can be troubleshooted using the SQL Server Profiler tool.

Applies to

Related Waits

See Also

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