RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate

Thanks for the info.

Too bad you can't get some metrics to show what was happening.

Yes, user satisfaction is the ultimate indicator of tuning success, but there are also metrics to back it up, they just need to be collected before and after.

Thanks,

Jared

"M Rafiq" <rafiq9857_at_hotmail.com>
Sent by: ml-errors_at_fatcity.com
 10/16/2003 10:34 AM
 Please respond to ORACLE-L  

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc: 
        Subject:        RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate

Jared,

Unfortunately at this stage I cannot quantify in numbers as I have left that
job 5 months back. But dealing with Oracle Financials 10.7 with version 7.3.4, I observed it practically that this table and it is indexes (i think
4 or 5 indexes) require special attention for performance reasons.

At my last employment that table was also used by customized application specially Manufactruring and stock locator application and heavy usage of inserts and deletes. If indexes were not rebuilt on that tablespace then I

have seen that users were complaining about slowness of thier jobs. So I made it a maintenance routine to rebuild indexes on gl_interface table after
monthly closing.

Apart from this, as you cannot change code in Oracle Financials(although I

did) , you to deal with indexes either through rebuilding them at regular intervals (may be six moths or a year) or adding new indexes based on your

observation of certain codes. One monthly job called ACCRUAL REBUILD RECONCILIATION was passing 36 hours and I have to add 6 indexes on 2 tables
and time went down to 1 hour. In certain codes they were suppresing indexes(perfectly indexed columns) resulting 15 mintues to fetch rows and after correcting that code it took less than second.

Now another database of Order Entry System. When I joined I observed a lot

of performance issues. After consulting with Development team,tracked all those tables with lot of regular deletes and inserts, rebuilt all indexes and got back 5GB of tablespace and performance was at their peak.

All those application was based on RULE optimizer so we were not analyzing

any table/indexes but based on experience with those applications, I was tracking those tables with large deletes and inserts through application(not
data load) and rebuilding indexes with regular interval to keep smooth performance.

In my opinion, we always need performance satisfaction of end user instead

of numbers.

If you have any specific question, please let me know.

Regards
Rafiq

Reply-To: ORACLE-L_at_fatcity.com
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: Wed, 15 Oct 2003 22:04:24 -0800

The 'better performance' part is what I would like to see some metrics on.

How much better? Is it worth the trouble?

If your indexes continually build up to the same size, what is being gained by saving some space for a period of time?

Thanks,

Jared

On Wed, 2003-10-15 at 18:04, M Rafiq wrote:
> Jared,
>
> Those tables are transit type of tables and depending on your volume of
> data, there are lot of deletes and inserts all the time resuling index
> fragmentation(holes due to deletes) and space usage.
>
> The rebuilding not only release the space but also reduces the index
> fragmentation. If you don't have table truncation option for such
tables
> then it is much better to rebuid indexes on such tables at regular
interval
> to release space and for better performance.
>
> As regard quantification, you many release sufficient amount of space
if
> your usage is higher. Here it was 7.3.4 database so no LMT involved.
>
> Regards
> Rafiq
>
>
>
>
>
>
>
> Reply-To: ORACLE-L_at_fatcity.com
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Date: Wed, 15 Oct 2003 13:19:24 -0800
>
> Please explain why these indexes must be built.
>
> What benefits do you see from it?
>
> Are they quantifiable?
>
> Jared
>
>
>
>
>
> "M Rafiq" <rafiq9857_at_hotmail.com>
> Sent by: ml-errors_at_fatcity.com
> 10/14/2003 03:49 PM
> Please respond to ORACLE-L
>
>
> To: Multiple recipients of list ORACLE-L
<ORACLE-L_at_fatcity.com>
> cc:
> Subject: RE: re Rebuilding Indexes in Oracle Apps --
was
RE:
> RE: Separate
>
>
> John
> What about gl_interface table indexes? I think indexes on all
*interface(
> tables must be rebuild on a regular interval...I was building indexes
on
> gl_interfaces and fnd_request* tables on monthly basis.
>
> Regards
> Rafiq
>
>
>
> Reply-To: ORACLE-L_at_fatcity.com
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Date: Tue, 14 Oct 2003 13:34:24 -0800
>
> Hemant,
>
> This applies on 11i only. I would rebuild all indexes supporting the
> WF_ITEM_ACTIVITY_STATUSES and WF_ATTRIBUTE_VALUES tables. I have been
> working on some AOL table(space) problems in the background and noticed
> that
> in 11i by default, we are not be purging _all_ the WF data that we
should
> be
> purging. I believe the current Purge routine purges activity rows whose
> persistence has expired and are marked 'TEMPORARY' and ignores those
that
> are COMPLETE (see below). My contention is that it should be deleting
old
> rows that are COMPLETEd... (Fyi, this is 12+ million rows...) Notes
> 141853.1, 144806.1, 132254.1, 148705.1, 148678.1 may help.
>
> You could check this using the following SQLs
>
> select activity_status, count(*)
> from applsys.wf_item_activity_statuses
> group by activity_status;
>
> select item_type,activity_status,count(*)
> from
> applsys.wf_item_activity_statuses where activity_status='COMPLETE'
> group by item_type,activity_status;
>
> Once the 'correct' purge is complete, the 'holey' indexes will need to
be
> rebuilt and the WF_ tables copied/truncated/recopied to shrink the HWM
to
> reasonable levels.
>
> Let me know what your install shows up.
> John Kanagaraj
> DB Soft Inc
> Phone: 408-970-7002 (W)
>
> Grace - Getting something we do NOT deserve
> Mercy - NOT getting something we DO deserve
> Click on 'http://www.needhim.org' for Grace and Mercy that is freely
> available!
>
> ** The opinions and facts contained in this message are entirely mine
and
> do
> not reflect those of my employer or customers **
>
> -----Original Message-----
> Sent: Tuesday, October 14, 2003 8:39 AM
> To: Multiple recipients of list ORACLE-L
>
>
>
> John,
>
> I rebuild the FND_CONCURRENT_REQUESTS indexes every four months [and
the
> table itself, occassionally].
> This Saturday I will also be rebuilding some ALR indexes.
> Which WorkFlow Indexes do you rebuild ?
>
> Hemant
>
> At 11:44 AM 13-10-03 -0800, you wrote:
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
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> Author: John Kanagaraj
> INET: john.kanagaraj_at_hds.com
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