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> ------------------------------------- ********************************************************************** The information contained in this communication is confidential, is intended only for the use of the recipient named above, and may be legally privileged. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please re-send this communication to the sender and delete the original message or any copy of it from your computer system. Thank You. 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.