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тАО04-10-2007 07:23 PM
тАО04-10-2007 07:23 PM
Bad Oracle Performance while database backup
we've done a DB restore to cooked filesystem. We've decided that it is more easily to manage the DB while residing in cooked fs then in rawdevices. After done the restore and start the first backup it takes almost TWO HOURS to write a 4,5GB backup to disk. The DB-files on a san-storage (EMC clarion). The backup-drive is another san-storage. If I try to put some data from /dev/zero to a file in the cooked fs everything works fine. Only the database performance is very bad!!! Can everyone have an idea what's going wrong? The HP/UX version is B.11.23 on Itanium.
kind regards
Christian
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тАО04-10-2007 07:33 PM
тАО04-10-2007 07:33 PM
Re: Bad Oracle Performance while database backup
1) Make sure a recent bi-annual patch ste is installed.
2) Make sure that oracle patches in addition to step 1 are installed. IF any were missing install them and relink oracle.
3) Have EMC check the cloning configuration of the disk array. If wrong it can massively impede performance.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО04-10-2007 07:42 PM
тАО04-10-2007 07:42 PM
Re: Bad Oracle Performance while database backup
thanks for your answer. I'll check the patches installed ...
I think everything is ok with EMC. If I use the dd everything works fine with a great performance.
Are there any relationships you know between async I/O and filesystem or are there any whitepapers how to setup an oracle DB an hp/ux cooked fs?
Christian
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тАО04-10-2007 08:02 PM
тАО04-10-2007 08:02 PM
Re: Bad Oracle Performance while database backup
For everything related to Oracle and HP-UX. Please see the link
http://h71028.www7.hp.com/enterprise/cache/4281-0-0-0-121.html
Kind Regards,
Rasheed Tamton.
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тАО04-10-2007 11:16 PM
тАО04-10-2007 11:16 PM
Re: Bad Oracle Performance while database backup
I suppose you are using about rman for backups? What is the database version and what are the non-default parameters (select name, value from v$parameter where isdefault = 'FALSE') values?
Best Regards,
Eric