High paging activity
Hi,
I'm working with a 9i RAC database with two nodes,in one node(having 8 CPUs),paging activity is very high(reason is due to ORACLE process only) it goes to 80%,but in another node there is no high paging activity,system admin people says the server will go down if it reaches 90%.What can i do to avoid high paging activity? Note: When the database is down,paging activity is normal,but only when the database is up,the paging activity is increased. Thanks, Malru |
Quote:
--n |
Or reduce the size of the Oracle cache.
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file cache
modern databases will cache their own file IO...
AIX by default also wants to use a bunch of ram for FILE IO caching... and so you waste lots of ram by double caching. Check the values for vmo minperm and maxperm (defaults are 20/80) I usually lower drastically via: vmo -p -o minperm%=5 -o maxperm%=20 -o maxclient%=20 |
also mount your filesystems using dio (direct I/O):
Code:
/oracle: |
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dio / cio
Actually, if this is a modern RAC implementation, it'd probably be better off using Concurrent IO instead of Direct IO...
http://oracle.ittoolbox.com/white-pa...urrent-io-2582 |
Ahh, we actually use both the old and new. Good to know.
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