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Home -> Community -> Mailing Lists -> Oracle-L -> RE: direct path read waits
Babu - Okay, so you have at least 4 devices? Temp, A, B, C? Be careful
because different mount points may actually be on the same device. The next
thing I would consider is whether some of the devices have different
characteristics, like cache, RAID vs. non-RAID, faster disks, etc. Then you
can check to see whether multiple extents are being used, so the disk head
has to move more. Make sure there isn't any contention from other users or
processes. The answer is bound to be there somewhere.
Dennis Williams
DBA, 40%OCP, 100% DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com
-----Original Message-----
Sent: Thursday, February 20, 2003 2:44 PM
To: Multiple recipients of list ORACLE-L
John
All the tablespaces are on different disks - Sorry I should have mentioned this in the original post itself...
Babu
John Kanagaraj
<john.kanagaraj_at_h To: Multiple recipients
of list ORACLE-L <ORACLE-L_at_fatcity.com>
ds.com> cc:
Sent by: Subject: RE: direct path
read waits
root_at_fatcity.com
02/20/03 03:11 PM
Please respond to
ORACLE-L
Your answer was buried in the question itself. If the TEMP tablespace had
to
contend with Tablespace C on the same 'disk' then such a result is
expected.
John Kanagaraj
Oracle Applications DBA
DBSoft Inc
(W): 408-970-7002
What would you see if you were allowed to look back at your life at the end of your journey in this earth?
> -----Original Message-----
> From: babu.nagarajan_at_Cummins.com [mailto:babu.nagarajan_at_Cummins.com]
> Sent: Thursday, February 20, 2003 11:41 AM
> To: Multiple recipients of list ORACLE-L
> Subject: direct path read waits
>
>
> All
>
> We are doing some performance testing while moving from one server to
> another. I was trying to time some index rebuilds and noticed
> something
> that I cant explain.
>
> I am rebuilding an index on a 1 million row table. Lets say its on
> tablespace A and when I rebuild it to tablespace B it does in
> 33 seconds. I
> put it back on A and then rebuild it on tablespace C it takes 1 min 40
> seconds. The only change here is the target tablespace.
>
> When I set 10046 level 12 and counted time waited (ela column)
>
> From A - B (33 seconds)
>
> sum of elapsed in "DIRECT PATH READ" = 394 ( i think this is cs)
>
> From A - C (1 min 40 sec)
>
> sum of elapsed in "DIRECT PATH READ" = 6251
>
> The P1 of all of these waits point to the same file (#4 part of TEMP
> tablespace)
>
> Why should the change in the target tablespace affect the
> time taken to
> read from the TEMP tablespace?
>
> TIA
>
> Babu
>
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> Author:
> INET: babu.nagarajan_at_Cummins.com
>
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: John Kanagaraj INET: john.kanagaraj_at_hds.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). _____________ This e-mail transmission and any attachments to it are intended solely for the use of the individual or entity to whom it is addressed and may contain confidential and privileged information. If you are not the intended recipient, your use, forwarding, printing, storing, disseminating, distribution, or copying of this communication is prohibited. If you received this communication in error, please notify the sender immediately by replying to this message and delete it from your computer. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: INET: babu.nagarajan_at_Cummins.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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: DENNIS WILLIAMS INET: DWILLIAMS_at_LIFETOUCH.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 Thu Feb 20 2003 - 15:19:04 CST
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