Oracle FAQ | Your Portal to the Oracle Knowledge Grid |
![]() |
![]() |
Home -> Community -> Mailing Lists -> Oracle-L -> RE: low blocks/read on temp
Hi Dave,
I just checked a few of my databases and the highest was 7 blocks per read, the lowest was 1.9. Why would you expect it to be so high? I believe the blocks per read for TEMP is a function of your db_file_multiblock_read_count, extent sizes, and cached blocks, just like with any other tablespace. Not sure if this is correct though since I think TEMP is usually read with direct reads (bypassing the buffer cache) and I'm not sure if direct reads determine their blocks/read the same way as regular db_file_sequential/scattered_reads.
Regards,
Brandon
-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Herring Dave - dherri
Sent: Tuesday, July 26, 2005 3:09 PM
To: Oracle-L_at_Freelists. Org (E-mail)
Subject: low blocks/read on temp
Has anyone run into situations where the avg blocks per read against their temporary tablespace seemed extremely low? We have a database block size of 32K, yet I'm seeing blocks per read on TEMP 5.2, on average. I would expect much, much higher, at least in the 20's. Is this a realistic expectation?
I'm running 9.2.0.4 on Tru64 5.1.
Thanks.
Dave
Dave Herring, DBA
Acxiom Corporation
3333 Finley
Downers Grove, IL 60515
wk: 630.944.4762
< <mailto:dherri_at_acxiom.com> mailto:dherri_at_acxiom.com>
Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it.
--
http://www.freelists.org/webpage/oracle-l
Received on Tue Jul 26 2005 - 17:33:46 CDT
![]() |
![]() |