seniorT-SQL
What is latch contention in SQL Server?
Updated May 17, 2026
Short answer
Latch contention occurs when threads compete for in-memory resource protection.
Deep explanation
Latches are lightweight synchronization primitives used to protect internal memory structures like pages. Unlike locks, they are not transaction-based. High contention leads to waits like PAGELATCH_UP or PAGELATCH_EX.
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