How to rebuild index in E-Business

Hi
As on core DB side we can check index status for rebuild with command
select owner,index_name,blevel,last_analyzed from dba_indexes where blevel>3 order by last_analyzed
and after that
alter index <index_name> rebuild compute statistics;
my question is can we do the same with my e-business R12.1.2 and 10.2.0.4 database or there is some other recommendation. I want to do this for performance increase.
Thanks
Krishna

Hi krishna,
Also please see
note 163208.1 bde_last_analyzed.sql - Verifies CBO Statistics
note 174605.1 bde_chk_cbo.sql - Reports Database Initialization Parameters related to an Apps 12 or 11i instance
note 396009.1 Database Initialization Parameters for Oracle Applications Release 12
note 216205.1 Database Initialization Parameters for Oracle Applications 11i
note 744143.1 Tuning performance on eBusiness suite
note 169935.1 Troubleshooting Oracle Applications Performance Issues
note 244040.1 Oracle E-Business Suite Recommended Performance Patches

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I want to rebuild an Index of schema A from Schema B.
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It is true what P. Forstmann said. However if you don't want to give the second user the ANY priviledge, then you can do a little workaround. Create a small procedure in Schema A that does the rebuild (maybe dynamically). Then grant execute rights on the procedure to Schema B.

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I wonder how to rebuild a BI Accelerator index, without deleting it previously ?
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Hi Benjamin,
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hi all
we got SQL 2012 enterprise edition on our production server, As our frag levels are more we are planning to do defragmentation but when we scheduled rebuild indexs last time this ran for 7-8hrs and drive spaces decreased rapidly so we have killed
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change recovery model to simple
configure m plan with offline mode
change to full after the plan finished
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->setting recovery model from full to simple is to save the disk space, as log will not increase
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Shrink Database (Rebuild Indexes)

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Why to shrink, as you probably know after rebuilding in may grow again :-)))
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Rebuilding indexes after importing...

My coworker and I are discussing whether it is necessary, or advised, to rebuild indexes after an import of the schema.
My thinking is that the index data is put into fresh blocks thereby creating a very flat index tree without any fragmentation.
But my coworker suspects that perhaps the blocks are built exactly as they existed in the source database.
I could understand, perhaps, if the refresh were done by using RMAN which copies block by block, but even then I'm not sure.
Can you help us understand this please?
Thanks.
Ed

Hi,
Normally, the indexes are build and statistics upfated after the import automatically. You do not ned to generate the statistics after the import until unless you are running very old version of database.
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[sfa-dev1:oracle:10.2.0] $ imp help=Y
Import: Release 10.2.0.4.0 - Production on Fri Nov 13 11:49:56 2009
Copyright (c) 1982, 2007, Oracle. All rights reserved.
You can let Import prompt you for parameters by entering the IMP
command followed by your username/password:
Example: IMP SCOTT/TIGER
Or, you can control how Import runs by entering the IMP command followed
by various arguments. To specify parameters, you use keywords:
Format: IMP KEYWORD=value or KEYWORD=(value1,value2,...,valueN)
Example: IMP SCOTT/TIGER IGNORE=Y TABLES=(EMP,DEPT) FULL=N
or TABLES=(T1:P1,T1:P2), if T1 is partitioned table
USERID must be the first parameter on the command line.
Keyword Description (Default) Keyword Description (Default)
USERID username/password FULL import entire file (N)
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FILE input files (EXPDAT.DMP) TOUSER list of usernames
SHOW just list file contents (N) TABLES list of table names
IGNORE ignore create errors (N) RECORDLENGTH length of IO record
GRANTS import grants (Y) INCTYPE incremental import type
INDEXES import indexes (Y) COMMIT commit array insert (N)
ROWS import data rows (Y) PARFILE parameter filename
LOG log file of screen output CONSTRAINTS import constraints (Y)
DESTROY overwrite tablespace data file (N)
INDEXFILE write table/index info to specified file
SKIP_UNUSABLE_INDEXES skip maintenance of unusable indexes (N)
FEEDBACK display progress every x rows(0)
TOID_NOVALIDATE skip validation of specified type ids
FILESIZE maximum size of each dump file
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Edited by: skvaish1 on Nov 13, 2009 11:50 AM

Rebuild Index VS Drop and Rebuild?

Hey all,
I am currently redesigning a weekly process (weekly coz we pre determined the rate of index fragmentation) for specific indexes that get massive updates. The old process has proved to be able to fix and maintain reports performance.
In this process we rebuild specific indexes using the below command:
Alter index index_name rebuild online;
This command takes around 10 min for selected indexes.
Testing the below took 2 min for 6 or 7 indexes.
Drop Index Index_Name;
Create Index Index_Name on Table_name (Col1, col, ..);
I know that indexes might not be used, and the application performance would be degraded with stale or non-existent stats. But our production and all our test DBs have procedures that daily gather stats on them.
I tested the below script to make sure that execution plan does not change:
SELECT ProductID, ProductName, MfrID FROM PRODUCT WHERE MFRID = 'Mfr1';
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)|
| 0 | SELECT STATEMENT | | 37 | 3737 | 13 (0)|
| 1 | TABLE ACCESS BY INDEX ROWID| PRODUCT | 37 | 3737 | 13 (0)|
| 2 | INDEX RANGE SCAN | PRODUCT_X1 | 37 | | 3 (0)|
dropping PRODUCT_X1 and recreating it only changed the cost to 12.
Gathering the stats again took the cost to 14.
No performance issues were faced and index was still used.
My question is: Is there any oracle recommendation that requires rebuilding the index instead of dropping and recreating it?
Is there any side effect to my approach that I did not consider?
Thank you

Charlov wrote:
I am currently redesigning a weekly process (weekly coz we pre determined the rate of index fragmentation)Nice. Not only have you defined and located index fragmentation but have also measured the rate at which it occurs.
Could you please share your definition of index fragmentation, how you detect it, and how you measure the rate of change of this fragmentation.
I am curious about all this since it can be repeatedly shown that Oracle btree indexes are never fragmented.
http://richardfoote.files.wordpress.com/2007/12/index-internals-rebuilding-the-truth-ii.pdf
The old process has proved to be able to fix and maintain reports performance.Great so you have traces and run time statistics from before and after the rebuild that highlight this mysterious fragmentation and show how the fragmentation caused the report to be slow, details what effects the rebuild had that caused the reports to perform better.
Please share them as these would be an interesting discussion point since no one has been able to show previously how an index rebuild caused a report to run faster or even show the fragmentation that caused it to be slow in the first place.
I mean it would be a pity if the report was just slow because of an inefficient plan and compressing an index or two that probably shouldn't be used in teh first place appears to temporarily speed it up. Could you imagine rebuilding indexes every week, because some developer put the wrong hint in a query? That would be pretty funny.

Rebuild index vs Analyze index

Hi All,
I am realy confused about rebuilding index versus Analyzing index.
Could anyone plz help me out what is the diffrence between them.
How to Perform analyze of indexes and Rebuld of Indexes for both Oracle 9i and 10g databases.
Thanks a lot

CKPT wrote:
You can see the posts of experts by jonathan
I am realy confused about rebuilding index versus Analyzing index. tell us you are getting confused why we need to ananlyze before reubild index? if so
if index analyzed the whole statistics of index will be gathered.... then you can check what is the hieght of the index.. according to the height of the index you need to take step is index need to be really rebuild or not...
lets see furhter posts from experts if not clear..Thanks OK, so you determine the height of an index is (say) 4. What then ? If you decide to rebuild the index and the index remains at a height of 4, what now ? Was it really worth doing and do you rebuild it again as the index height is still 4 and still within your index rebuild criteria ? At what point do you decide that rebuilding the index just because it has a height of 4 is a total waste of time in this case ?
OK, so you determine the index only has a height of (say) 3, does that mean you don't rebuild the index ? But what if by rebuilding the index, the index now reduces to a height of just 1 ? Perhaps not rebuilding the index even though it has just a height of 3 and doesn't currently meet your index rebuild criteria is totally the wrong thing to do and a rebuild would result in a significantly leaner and more efficient index structure ?
So what if it's pointless rebuilding an index with a height of 4 but another index with a height of 3 is a perfect candidate to be rebuilt ?
Perhaps knowing just the height of an index leaves one totally clueless after all as to whether the index might benefit from an index rebuild ...
Cheers
Richard Foote
http://richardfoote.wordpress.com/

Multiple objects with same name when rebuilding index online

I am looking for advice on how to handle a race-condition in sql server, related to reading metadata while an online index rebuild is being performed.
The problem is as follows:
At some point we execute the following statement:
SELECT
obj.object_id AS id,
scm.name AS scm,
obj.name AS name,
obj.type AS type,
ds.name AS dataspace_name,
prop.value AS description,
part.data_compression_desc as compression_desc
FROM sys.objects AS obj
INNER JOIN sys.schemas AS scm ON obj.schema_id = scm.schema_id
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WHERE obj.type = 'U' OR obj.type = 'S'";
The statement returns some metadata for indexes (indices?), the purpose of wich is not the subject.
When executed while an online index rebuild is running, a race condition occurs: When the rebuilding enters the final phase, the new index, which have the same name, becomes visible and thus results in two rows with the same name (from sys.object). I am unaware
if this only occurs for clustered index (which is what we have observed).
We became aware of this behaviour, as we added the metadata to a .Net Dictionary using name as key, and received a duplicate key exception. We have, hoewever, not been able to reproduce the situation, due to the nature of the race condition, and we found very
little documentation on the subject.
What we would like to do now, is to differentiate between the two. We see two options:
1) We could just use the first of the rows and ignore the second. This solution would require that the metadata for both rows are identical.
2) We could discern the "real" index from the "rebuilding" index. This requires some kind of extension of the Where-part.
We have not been able to determine if the requirements for either option is present, as we havent found any documentation, nor have we been able to test for differences, as we cannot reproduce the situation.
We would also like some way of reproducing the situation, so ideas as to how to do that is welcome.
Can anyone direct me to relevant documentation, or alternate solutions.
HRP

1. Use the index with the lower fragmentation to identify the newly rebuilt index (as it almost always will have lower fragmentation)
2. To reproduce, block the online index rebuild process by trying to alter the table's definition in a transaction (and don't commit, which will place schema lock on the table)
Satish Kartan http://www.sqlfood.com/

How to update the bucketset of business rules in MDS through Rules SDK

How to update the bucketset of business rules in MDS through Rules SDK.
Any sample code which will help me........ :)
Is it possible to expose a Business Rule as webservice which was created with the help of Java fact?
Edited by: 984804 on Jan 29, 2013 6:12 PM

FYI, the output of this call returns something like:
<?xml version="1.0" encoding="UTF-8"?>
<queryplan>
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How to judge index health

Hi
i just want to know how to judge index is healthy
i know i should look at
BLEVEL , LEAF_BLOCKS , DISTINCT_KEYS , CLUSTERING_FACTOR
in dba_indexes
but how to calculate from this value the health of an index
I know that BLEVEL should be 3 or less , any other rules?
Thanks very much

Thanks for all replies , BLEVEL is 4 or more means u need to rebuild ur index.
After reading , i am including example of more jnior dbas to help them understand , wen i can say that clustering factor is good or bad for an index
Ex:
suppose i have T1 table , and i have Id.T1 indexed with index called IDX1 ,
IF
select blocks from dba_tables where table_name ='T1';
= or close to
select clustering_factor from dba_indexes where index_name = 'IDX1';
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How to rebuild index in E-Business

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