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тАО05-06-2002 07:18 AM
тАО05-06-2002 07:18 AM
Disk Backup runs slow.
Oracle 8i running on N-Class (HP-UX 11). around 300 Data files
We run HotBackup every night.
The perl script does following things.
Take each data file and copy into a different dirctory and then compress it and then go to next datafile ... This usually runs for 5 hours but this duration increases everyday (Today it is running for 15 hrs.!) But if we bounce the box it will run for 5 hours again and grows slowly day by day.
I want to know why this process keeps on increasing and why reboot fixes it.
Thanks
Uday
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тАО05-06-2002 08:13 AM
тАО05-06-2002 08:13 AM
Re: Disk Backup runs slow.
Just some thoughts: Do you have any error message/warning in syslog.log ? Anything regrading resource overflow ? Did you check the resource usage with glance ? Any kernel tuning required ? Any patches ? Anything wrong with the script ( some counter increase ?)
HTH,
Shiju
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тАО05-06-2002 08:16 AM
тАО05-06-2002 08:16 AM
Re: Disk Backup runs slow.
Memory leak? Check your swap area before starting and then afterwards. Hopefully you have glance, if so "watch the process".
live free or die
harry
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тАО05-06-2002 08:18 AM
тАО05-06-2002 08:18 AM
Re: Disk Backup runs slow.
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тАО05-06-2002 08:24 AM
тАО05-06-2002 08:24 AM
Re: Disk Backup runs slow.
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тАО05-06-2002 08:24 AM
тАО05-06-2002 08:24 AM
Re: Disk Backup runs slow.
Perhaps memory buffers, I reduce my memory buffers cache (dbc_pct) and the backups gone very slow then I increase it and gone fast.
Do you change this kernel param?
Regards,
Justo.
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тАО05-06-2002 08:36 AM
тАО05-06-2002 08:36 AM
Re: Disk Backup runs slow.
I've almost all recommended patches on this box.
Attached here is glimpses of system status during backup.
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тАО05-06-2002 08:51 AM
тАО05-06-2002 08:51 AM
Re: Disk Backup runs slow.
2 ways ..
=========
1) Use glance ..
# cd /opt/perf/examples/adviser
# glance -adviser_only -syntax proc_mem_leak -j300 > output.file
===> Run glance in adviser mode every 5 minutes with the use of the syntax in "proc_mem_leak".
2) This is from previous thread (thanks JRF)
# UNIX95= ps -e -o "user,vsz,pid,ppid,args" | sort -rnk2 | more
===> Look for growth in "vsz" over time.
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тАО05-06-2002 08:52 AM
тАО05-06-2002 08:52 AM
Re: Disk Backup runs slow.
What about zombie processes? (I have a user who creates zombie processes with his perl scripts.) Maybe your backup scripts also leaves zombies that need resources for nothing.
Create a new account from where you only run the backup scripts, e.g. uid=dbbup, gid=dba. After finishing backups, have a look if there are some processes of this 'database backup user' still on the system (should not).
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тАО05-06-2002 09:03 AM
тАО05-06-2002 09:03 AM
Re: Disk Backup runs slow.
My output also have the famous UNIX95 output for top ten process sorting on vsz.
I would like to run glance in advisory mode. ( Throw some for light on this .Pls.)
Thomas,
There are no Zombies. and once back up finished system runs normally. Users complain slow responce during backup ( This could be due to compress command)
Justo,
dbc_max_pct is 8 and min is 5.