RE: Lob Performance
- From: Laimutis.Nedzinskas@xxxxxx
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 27 Aug 2010 07:03:09 +0300
Metalink has some good articles. In my practice I've encountered the
following issues:
- "hw contention" event which is for example fixed in 10.2.0.4 but the fix
is not enabled by default. You have to set an event. Metalink has few
articles how to detect if you are suffering and how to fix it.
- if lob is "small" (for example, average is 8K ) then enabling LOB caching
improves performance. Note, that LOB's are supposed to be LARGE OBJECTS
meaning caching is disabled by default else it would blow out the cache.
But more often than not LOB size is something just above what ordinary
varchar2 column would hold.
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Please consider the environment before printing this e-mail
"Kenneth Naim"
<kennethnaim@gmai
l.com> To
Sent by: "'Leyi Zhang \(Kamus\)'"
oracle-l-bounce@f <kamusis@xxxxxxxxx>
reelists.org cc
<oracle-l@xxxxxxxxxxxxx>
Subject
2010.08.23 13:22 RE: Lob Performance
Please respond to
kennethnaim@gmail
.com
Yes, I have. I’m looking for something more definitive, less theory and
more application.
Thanks,
Ken
From: Leyi Zhang (Kamus) [mailto:kamusis@xxxxxxxxx]
Sent: Monday, August 23, 2010 2:34 AM
To: kennethnaim@xxxxxxxxx
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: Lob Performance
Have you read online doc: Oracle® Database SecureFiles and Large Objects
Developer's Guide
http://download.oracle.com/docs/cd/E11882_01/appdev.112/e10645/adlob_performance.htm#i1007089
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Kamus <kamusis@xxxxxxxxx>
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On Mon, Aug 23, 2010 at 6:01 AM, Kenneth Naim <kennethnaim@xxxxxxxxx>
wrote:
I haven't dealt with lob performance much. Can someone point to a good site
or whitepaper how to measure lob size, test and improve (b)lob performance.
I'm checking google and mos and haven't found a comprehensive article.
Thanks,
Ken
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