How To ... » oracle http://howto.tawaret.com Fri, 27 May 2011 08:53:25 +0000 en hourly 1 http://wordpress.org/?v=3.1.3 Flush the buffer cache in Oracle http://howto.tawaret.com/flush-the-buffer-cache-in-oracle/ http://howto.tawaret.com/flush-the-buffer-cache-in-oracle/#comments Tue, 26 Jun 2007 10:01:15 +0000 pjdc http://howto.tawaret.com/index.php/flush-the-buffer-cache-in-oracle/ Flush the buffer cache in [tag]Oracle[/tag]. This invalidates also the read cache, so the query performance results provides from the physical reads time. 
alter system flush buffer_cache;

This command is not available prior to 10g. It flushes the buffer cache in the SGA.
9i had an undocumented command to flush the buffer cache: 

alter session set events = 'immediate trace name flush_cache';
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