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

From: <Rajesh.Rao_at_jpmchase.com>
Date: Mon, 03 Nov 2003 08:54:25 -0800
Message-ID: <F001.005D5750.20031103085425@fatcity.com>

Thanks KG.

There were underlying OS I/O issues. The SA is looking to fix the same.

Regards
Raj

Rajesh L. Rao
DCI - Triad, Oracle DBA
IBM Global Services, JPMC Account
Phone: 516 5746065
E-mail: raor_at_us.ibm.com

                                                                                                                   
                    "K                                                                                             
                    Gopalakrishnan       To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>       
                    "                    cc:                                                                       
                    <kaygopal_at_yaho       Subject:     Re: What is a local write wait?                              
                    o.com>                                                                                         
                    Sent by:                                                                                       
                    ml-errors_at_fatc                                                                                 
                    ity.com                                                                                        
                                                                                                                   
                                                                                                                   
                    11/01/2003                                                                                     
                    09:54 AM                                                                                       
                    Please respond                                                                                 
                    to ORACLE-L

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
-- 
Author: 
  INET: Rajesh.Rao_at_jpmchase.com

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).

Received on Mon Nov 03 2003 - 10:54:25 CST