https://learn.microsoft.com/en-us/sql/t-sql/database-console-commands/dbcc-dropcleanbuffers-transact-sql?view=sql-server-ver15
DBCC DROPCLEANBUFFERS (Transact-SQL) - SQL Server | Microsoft Learn
DBCC DROPCLEANBUFFERS removes all clean buffers from the buffer pool, and columnstore objects from the columnstore object pool.
dbcc dropcleanbufferssql servertransactmicrosoftlearn