RE: RE: wait events and v$session_event
- From: "Jamadagni, Rajendra" <Rajendra.Jamadagni@xxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 11 May 2004 12:49:12 -0400
It doesn't matter how many sessions you have running ... Anytime kernel
wants to read datafile you'll see db file read waits. It has nothing to
do with # of session.
The wait indicates ... "I am kernel and I am waiting till someone reads
x (p3) number of blocks from file (p1) starting with block id (p2) and
makes it available in the buffer cache".
Raj
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Rajendra dot Jamadagni at nospamespn dot com=20
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-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of ryan.gaffuri@xxxxxxx
Sent: Tuesday, May 11, 2004 12:23 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: RE: wait events and v$session_event
Cary,
Could you be a little more specific, I don't quite understand this? I am
using one node right now for everything in my ETL process. However, we
have load_balancing turned on.=20
Also, why would I get file read waits if I just have one session
running?=20
One note worth
mentioning here is that even the famous "I'll do TP on one RAC node and
query-only on the other" strategy is prone to lots of "global cache *"
activity.
Why? Because of the undo blocks that are used by both nodes.
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