Final answer:
To resolve a suspended query in SQL Server, identify the suspended query and its wait type, then address the underlying resource contention or, as a last resort, kill the query using the KILL command with caution.
Step-by-step explanation:
To resolve a suspended query in SQL Server, you first need to understand what causes a query to be suspended. A query can be suspended due to several reasons, such as waiting for resources (like I/O, locks), waiting for a worker thread, or being preempted by a higher priority process. To address a suspended query, follow these steps:
Identify the suspended query using SQL Server Management Studio (SSMS) or a query such as SELECT * FROM sys.dm_exec_requests WHERE status = 'suspended';
- Check the wait type associated with the suspended query to understand the resource it's waiting on.
- Resolve the underlying resource contention. For example, if a query is waiting on disk I/O, consider optimizing the query or improving disk performance. If it's due to lock contention, investigate what other queries or transactions are holding the locks and address them.
- If necessary, you can also try killing the suspended query with the KILL command followed by the session ID, but do this with caution as it will roll back the transaction.
Remember that preemptively killing a query should be a last resort. It's important to investigate and alleviate the root cause to prevent future suspensions.