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тАО08-04-2005 11:54 PM
тАО08-04-2005 11:54 PM
Memory climbs to 100% during DB backup and stays there
rp7420 w/11.i (4cpu/8GB)
Oracle 9i using BMC OBacktrack
Veritas Cluster Database Edition v3.5
We have a strange problem when we try to do a cold backup of our databases.
Normally the system runs ~60% memory utilization. When we start the cold backup, memory dips slightly, then ramps up to ~80% and stays there for a few minutes. If no problems occur, after the backup memory resumes it's normal 60%.
About 50% of the time, after a few minutes into the backup at 80% memory usage, it shoots up to 100% and stays there. This virtually hangs the server and we have to reboot it to solve the problem.
All the recommended patches are installed. We can reproduce the problem with the cluster up and down.
Any ideas?
Thanks,
Steve.
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тАО08-04-2005 11:58 PM
тАО08-04-2005 11:58 PM
Re: Memory climbs to 100% during DB backup and stays there
It's not the most elegant solution, but it would get you an answer.
HP has tools that can tell where the memory usage issues are.
I would assume that you've talked to whoever it is that supplies your backup software about patches there.
Hope this helps,
Oz
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тАО08-05-2005 12:03 AM
тАО08-05-2005 12:03 AM
Re: Memory climbs to 100% during DB backup and stays there
"HP's protocol is to only analyze dumps that are generated by a system crash .
If the system hung and crashed on it's own , we'll be happy to take a look at it."
They want me to run a performance script when the problem occurs - but the server is hung and nothing will run correctly.
We have our DBA's looking into the obacktrack side, I want to make sure I've covered all the OS/Cluster possibilities.
Should the memory increase when a successfull backup is taking place? I would think since this is a cold backup, the database will shutdown - releasing memory?
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тАО08-05-2005 01:09 AM
тАО08-05-2005 01:09 AM
Re: Memory climbs to 100% during DB backup and stays there
You start the backup with BMC oTrack. Right??
Now as backup starts, the memoru utlization goes up. Right?? When it is at about 80 % or so, do following to know what processes are using most of the memory.
glance -m
glance -g
UNIX95= ps -ef -o 'pid,ppid,vsz,args,ruser' | sort -nrk3
Check what are those processes. Is there any config file for BMC oTrack?? You should give it a look. Also how does disk utlization show when this whole thing is going on.
I would also suggest to put UNIX95 command in crontab, when you start backup and keep it running at regular inetrval (1 min.) and analyze it.
Anil
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тАО08-05-2005 05:47 AM
тАО08-05-2005 05:47 AM
Re: Memory climbs to 100% during DB backup and stays there
We tested another database instance on the same server and we did not see this problem, so at least we are now pointing away from the OS or the Cluster as culprits.
I won't be able to test further until Monday so I'll update this then.
Steve.
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тАО08-05-2005 06:31 AM
тАО08-05-2005 06:31 AM
Re: Memory climbs to 100% during DB backup and stays there
Also I am guessing your maxdsize is so high that it might be allowing it to exploit all your memory which is good expect when you have applications that keep taking more and more memory.
Take a look at swapinfo -t and also make sure your swap is big enough.
Hope this helps.
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тАО08-05-2005 07:46 AM
тАО08-05-2005 07:46 AM
Re: Memory climbs to 100% during DB backup and stays there
Swap space is okay (~45%), however once memory goes to 100%, vhand (swapper process) hits 100%+ CPU utilization, which I guess is to be expected.
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тАО08-06-2005 08:52 AM
тАО08-06-2005 08:52 AM
Re: Memory climbs to 100% during DB backup and stays there
I would suggest running a extract of the process data in measureware to see what processes are running every minute and extract the global metrics to see what your global memory looks like.
Emil Velez
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тАО08-08-2005 01:51 AM
тАО08-08-2005 01:51 AM
Re: Memory climbs to 100% during DB backup and stays there
Thanks again,
Steve.
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тАО08-08-2005 01:52 AM
тАО08-08-2005 01:52 AM