Oracle-L: Re: What is a local write wait?

From: K Gopalakrishnan <kaygopal_at_yahoo.com>
Date: Sat, 01 Nov 2003 06:54:24 -0800
Message-ID: <F001.005D55A0.20031101065424@fatcity.com>

Rajesh:

Typically DBWR has to free up some buffers when you want to read something from the disk. During this process there are chances that you will be waiting for your local buffer (i.e blocks dirtied/invalidated by your session) to be written to disk. During this time the
waits are shown as local write waits.

BTW do you have any other write waits or just seeing local waits? And also are you noticing any timeouts for this waits? Typically we wait for local wait up to one second and spin (or retry) again.. Timeouts for local write indicates a serious problem unless you have tiny buffer cache or extremely slow disk'

Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Saturday, November 01, 2003 12:54 PM

> Was creating an index with a degree of 4, and in unrecoverable manner?
> There were few waits for an event called "local write wait". Can anyone
> shed more light on this wait?
>
> Thanks
> Raj
>
>
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
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> Author:
> INET: Rajesh.Rao_at_jpmchase.com
>
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Author: K Gopalakrishnan
  INET: kaygopal_at_yahoo.com

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Received on Sat Nov 01 2003 - 08:54:24 CST