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DBCC DROPCLEANBUFFERS (Transact-SQL)

Applies To: SQL Server 2014, SQL Server 2016 Preview

Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).

Removes all clean buffers from the buffer pool.

Applies to: SQL Server (SQL Server 2008 through current version).

Topic link icon Transact-SQL Syntax Conventions

DBCC DROPCLEANBUFFERS [ WITH NO_INFOMSGS ]

WITH NO_INFOMSGS

Suppresses all informational messages.

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.

DBCC DROPCLEANBUFFERS returns:

DBCC execution completed. If DBCC printed error messages, contact your system administrator.

Requires membership in the sysadmin fixed server role.

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