SQL SERVER – MARK_IN_USE_FOR_REMOVAL Cache Scope and Costs

To Remove Unused cache entries, I first inspect cache and workload evidence. My original intervention followed other customer tuning work.

-- Historical exceptional intervention, NOT RUN:
-- DBCC FREESYSTEMCACHE ('ALL') WITH MARK_IN_USE_FOR_REMOVAL;
SELECT name, type, entries_count, entries_in_use_count
FROM sys.dm_os_memory_cache_counters ORDER BY entries_count DESC;

MARK_IN_USE_FOR_REMOVAL marks in-use entries for removal after use ends. Newly created entries are not covered. FREESYSTEMCACHE affects more than unused execution plans. SQL Server normally manages these caches.

The customer improved after a one-time action. That result does not establish a universal memory remedy. Collect cache and memory-clerk evidence alongside the affected workload. Clearing caches can trigger expensive recompilation and rebuilding.

The inventory reports cache entries, rather than reclaimable memory or complete pressure. The old command remains a disabled template. Test any narrower intervention with expected warmup and application effects. Preserve a comparable baseline.

Reference: FREESYSTEMCACHE marking behavior.

Related reading

• Comprehensive Database Performance Health Check
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Cache clearing is not a permanent workload correction, it is an intervention with rebuilding and warmup costs.

Published by Pinal Dave on SQLAuthority. More of my work at pinaldave.com.