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DBCC DROPCLEANBUFFERS (Transact-SQL)

  • Article

Removes all clean buffers from the buffer pool.

Topic link iconTransact-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)

Help and Information

Getting SQL Server 2005 Assistance