RE: About AIX configuration for Oracle

From: Allen, Brandon <>
Date: Tue, 20 Oct 2009 09:44:21 -0700
Message-ID: <64BAF54438380142A0BF94A23224A31E112CB4C1C9_at_ONEWS06.oneneck.corp>

On a related topic, I recently started looking into implementing flashback database for my database on AIX 5.3, however it wasn't clear to me if the flashback logs should be on a filesystem mounted with the CIO option or not, so I did some research and as usual came up with conflicting advice, so then I opened an SR for clarification and unfortunately was given the wrong answer. Only after testing myself and verifying by checking the open flashback log files with lsof was I able to confirm that Oracle does indeed open the flashback logs with the cio flag automatically if you have filesystemio_options=setall, so it appears that concurrent I/O should be used for flashback logs (despite what the documentation and Metalink notes say), and that it is automatically used if you set filesystemio_options=setall, just like it is automatic for data files, control files and redo log files, so you don't need to create a separate filesystem for it.


-----Original Message-----

From: [] On Behalf Of Nuno Souto

Also please note that how Oracle handles Concurrent IO changes from patch level to patch level: you must check what yours is doing with truss.

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-- Received on Tue Oct 20 2009 - 11:44:21 CDT

Original text of this message