RE: low blocks/read on temp

  • From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
  • To: <Dave.Herring@xxxxxxxxxx>, "Oracle-L@Freelists. Org (E-mail)" <oracle-l@xxxxxxxxxxxxx>
  • Date: Tue, 26 Jul 2005 15:33:02 -0700

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@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]On 
Behalf Of Herring Dave - dherri
Sent: Tuesday, July 26, 2005 3:09 PM
To: Oracle-L@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@xxxxxxxxxx> mailto:dherri@xxxxxxxxxx>

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