if you mean that the oracle is swapping it's memory? you can use LOCK_SGA init parameter with the oracle to make it lock the sga in the memory without doing any swap. you should use lock_sga with rac any way. This parameter is not working in all platforms, but i think it works with linux. Regards, Oded. On 7/13/05, Teehan, Mark <mark.teehan@xxxxxxxx> wrote: > > Hi all > I have several redhat blade clusters running 10.1.0.4 <http://10.1.0.4>RAC on > 2.4.9-e.43enterprise. All database storage is OCFS, with ext3 for backups, > home dirs etc. The servers have 12GB of RAM, of which about 2GB is allocated > to the database, which is fine. Linux, in its wisdom, uses all free memory > (10GB in this case) for filesystem caching for the non OCFS filesystems > (since OCFS uses directIO); so every night when I do a backup it swallows up > all available memory and foolishly sends itself into a swapping frenzy; and > afterwards it sometimes cannot allocate enough free mem for background > processes. This seems to be worse on e43; I was on e27 until recently. Does > anyone know how to control filesystem block caching? Or how to get it to > de-cache some? For instance, I have noticed that gziping a file, then > ctrl-C'ing it can free up a chunk of RAM, I assume it de-caches the original > uncompressed file. But its not enough! > > Rgds > Mark > > > ============================================================================== > Please access the attached hyperlink for an important electronic > communications disclaimer: > > http://www.csfb.com/legal_terms/disclaimer_external_email.shtml > > > ============================================================================== > > -- > //www.freelists.org/webpage/oracle-l >