Answer
Blocking occurs when a session holds a lock required by another. Debugging tools include:
- sp_whoisactive
- sys.dm_exec_requests
- Extended events
- Activity Monitor
Quick Answer
Lock waits happen when one transaction needs a lock already held by another. A blocking chain is multiple transactions queued behind the head blocker. Debug using sys.dm_exec_requests, sys.dm_os_waiting_tasks, or the blocking report in Query Store. The head blocker is always the root cause — fix that transaction first.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ