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тАО09-16-2004 11:02 PM
тАО09-16-2004 11:02 PM
Oracle datawarahouse: i/o stuff
We have a new warehouse system running on an NPAR(4 cpu and 4 gb ram). HP-UX 11i and Oracle 9.2.0.4.
Trying to understand two things actually.
First the combination of OS parameters afftecting async i/o.
Plus are there any guidelines for mount options of oracle filesystems. (DB is no arc mode.)
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тАО09-16-2004 11:21 PM
тАО09-16-2004 11:21 PM
Re: Oracle datawarahouse: i/o stuff
We are precisly discussing this on this thread:
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=697612
Regards,
Eric
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тАО09-16-2004 11:24 PM
тАО09-16-2004 11:24 PM
Re: Oracle datawarahouse: i/o stuff
welcome to the forum !
There are a good few threads on the subjects.
I had a similar question regarding mount options for oracle DB
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=193104
also check this thread :
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=62288
What is the backend storage ?
Regards
Jean-Luc
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тАО09-16-2004 11:32 PM
тАО09-16-2004 11:32 PM
Re: Oracle datawarahouse: i/o stuff
Oracle :
dbwr_io_slaves :8
db_writer_processes :1
disk_asynch_io TRUE
HP-UX:
max_async_ports 50
aio_listio_max 256
aio_max_ops 2048
aio_physmem_pct 10
aio_prio_delta_max 20
fs_async 0
dbc_max_pct 10
dbc_min_pct 5
We have realized that oracle filesystems are all mounted with log option default mincache and convosync options.
Before looking into db, we wanted to take a look at OS site and found some configuration issues like these.
http://www.doag.org/pub/docs/sig/sap/2004-03/Dorer1.pdf
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тАО09-17-2004 01:36 AM
тАО09-17-2004 01:36 AM
Re: Oracle datawarahouse: i/o stuff
concerning async i/o, the following kernel parameters needs to be reviewed:
a. max_async_ports limits the maximum number of processes that can concurrently use /dev/async
b. aio_max_ops limits the maximum number of asynchronous i/o operations that can be queued at any time. Set this parameter to the default value (2048)
also read metalink note: 139272.1 "HP-UX: Asynchronous i/o"
regards
Yogeeraj
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тАО09-17-2004 02:10 AM
тАО09-17-2004 02:10 AM
Re: Oracle datawarahouse: i/o stuff
db_writer_processes :1 set.I think that, in this situation using mutliple dw writers instead of io slaves may provide some performace gain.
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тАО10-10-2004 07:46 PM
тАО10-10-2004 07:46 PM