DBCC DROPCLEANBUFFERS (Transact-SQL)
Removes all clean buffers from the buffer pool.
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Transact-SQL Syntax Conventions
Syntax
DBCC DROPCLEANBUFFERS [ WITH NO_INFOMSGS ]
Arguments
- WITH NO_INFOMSGS
Suppresses all informational messages.
Result Sets
DBCC DROPCLEANBUFFERS returns:
DBCC execution completed. If DBCC printed error messages, contact your system administrator.
Remarks
Use DBCC DROPCLEANBUFFERS to test queries with a cold buffer cache without shutting down and restarting the server.
To drop clean buffers from the buffer pool, first use CHECKPOINT to produce a cold buffer cache. This forces all dirty pages for the current database to be written to disk and cleans the buffers. After you do this, you can issue DBCC DROPCLEANBUFFERS command to remove all buffers from the buffer pool.
Permissions
Requires membership in the sysadmin fixed server role.
See Also
Reference
DBCC (Transact-SQL)
CHECKPOINT (Transact-SQL)