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RE: wait event puzzler

From: K Gopalakrishnan <kaygopal_at_yahoo.com>
Date: Wed, 11 Jun 2003 10:34:57 -0700
Message-ID: <F001.005AF503.20030611101920@fatcity.com>


Dennis:

THe event 'db file sequential read' is NOT always an INDEX Scan. It is just a single block read which TYPICALLY happens during an INDEX scan. The word 'TYPICALLY' is the key here.

Best Regards,
K Gopalakrishnan

-----Original Message-----
Meng, Dennis
Sent: Wednesday, June 11, 2003 11:02 AM
To: Multiple recipients of list ORACLE-L

Good day all,
We have a bunch of queries in our data warehouse environment that are taking a long time to complete.
I did a select on v$session_wait on one of the queries when it is running and it shows the wait event to be 'db file sequential read', which means it is scanning index blocks, correct? But when I put the p1 p2 p3 values into another query to see which segment it belongs to, it shows me a table, not an index. How can this be?

TIA
Dennis



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Received on Wed Jun 11 2003 - 12:34:57 CDT

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