RE: RE: wait events and v$session_event

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Tue, 11 May 2004 12:49:12 -0400
Message-ID: <A186CBDC8B1D61438BC50F1A77E91F73075BD7CF@xchgbrsm1.corp.espn.pvt>

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

---

--------=20

Rajendra dot Jamadagni at nospamespn dot com=20 All Views expressed in this email are strictly personal.=20 select standard_disclaimer from company_requirements;=20 QOTD: Any clod can have facts, having an opinion is an art !

-----Original Message-----

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of ryan.gaffuri_at_cox.net Sent: Tuesday, May 11, 2004 12:23 PM
To: oracle-l_at_freelists.org
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.

---

Please see the official ORACLE-L FAQ: http://www.orafaq.com

---

To unsubscribe send email to: oracle-l-request_at_freelists.org put 'unsubscribe' in the subject line.

--
Archives are at http://www.freelists.org/archives/oracle-l/
FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html


-----------------------------------------------------------------

Received on Tue May 11 2004 - 11:48:03 CDT