DBCC DROPCLEANBUFFERS (Transact-SQL)

DBCC DROPCLEANBUFFERS (Transact-SQL)

 

THIS TOPIC APPLIES TO: yesSQL Server noAzure SQL Database yesAzure SQL Data Warehouse yesParallel Data Warehouse

Removes all clean buffers from the buffer pool.

Topic link icon Transact-SQL Syntax Conventions


DBCC DROPCLEANBUFFERS [ WITH NO_INFOMSGS ]
-- Azure SQL Data Warehouse and Parallel Data Warehouse
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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