First of all, use "Top Sessions" to find out what is SMON doing. I suspect
that you've hit some coalescing bug. Error message looks like AIX, but you
haven't listed anything. Try with "dmesg" and see whether there are any errors on the OS side. AIX can do aio on JFS and there might be a problem or one of your raw devices isn't reachable any more (SAN perhaps?).


On 2003.06.23 07:49, [EMAIL PROTECTED] wrote:
 I recently upgraded a test server and found out today that it was
hanging. SQLPLUS etc...
I checked alert log and found following errors
WARNING: aiowait timed out 1 times
WARNING: aiowait timed out 2 times

I shutdown and restarted and since then Ive noticed that only
certain queries hang and the SMON process is running at 50% CPU.

This Test service has been running for ages, allthough I did do an
upgrade to the Application a week ago.

Its the end of day so I will leave it running and see if SMON finishes.
Ive checked space etc..checked metalink briefly but if any of you
can give me some suggestions I will try them.

thanks

Sam

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