09-26-2001
Hmm... We have had a few freak happeneings here at work with our HP-UX11/Oracle 8/9 servers. Some of them were related to a number of HP recommended patches we applied - one of the patches "broke" certain operations on our affected Oracle processes. Has anything changed, or been patched/unpatched before this started?
Also, we had a small flaw in one of our memory modules, this cause some wierd, wacky behavior at random times. Have you checked any hardware issues, or had any problems with other components of the server?
It's odd that unmounting/mounting disks and restarting Oracle helps. Is your disk local, or stored externally or over the network? Either way, have you checked the connectors? Is the server well-cooled?
And finally, does this happen all at once, or does performance degrade prior to downtime? If you can, have your DBA run a trace. He should be able to troubleshoot Oracle-specific problems, like exessive disk I/O or problems initializing shared memory.
Let me know how the progress goes - I'm very interested to see what it ends up being...
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