Mistake: treating Read Committed Snapshot as a free replacement for locking. SQL Server uses row versions in TempDB to provide read-committed semantics while reducing reader-writer blocking, but busy systems may incur substantial version-store I/O and disk usage. section 10.12
Use it when lock contention is harming performance, then assess TempDB capacity and workload behavior first. It is most attractive when TempDB has abundant free space and is not I/O bound; optimistic concurrency is not a magic bullet. section 10.12 section 10.14
Apply these checks before enabling it:
- Confirm that the problem is lock contention rather than an unrelated performance issue. section 10.14
- Estimate additional TempDB I/O and disk-space requirements for the production workload. section 10.12
- Inspect the version store during testing or diagnosis with sys.dm_tran_version_store. section 10.12
Listing 10.30 Enabling Read Committed Snapshot
ALTER DATABASE MarketingArchive SET READ_COMMITTED_SNAPSHOT ON WITH NO_WAIT ;
Enable Read Committed Snapshot for a database with ALTER DATABASE ... SET READ_COMMITTED_SNAPSHOT ON WITH NO_WAIT. section 10.12
