seniorT-SQL
What is SQL Server wait statistics and how do you interpret them?
Updated May 17, 2026
Short answer
Wait statistics measure time spent waiting on resources like CPU, IO, locks, and memory.
Deep explanation
SQL Server tracks waits to identify bottlenecks. Common waits include PAGEIOLATCH (disk IO), CXPACKET (parallelism), LCK_M_* (locking), and SOS_SCHEDULER_YIELD (CPU pressure). Proper analysis involves removing noise, categorizing waits, and correlating with workload patterns.
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