Compute Statistics after create a index

Good night, I tryed it before and got no help.
So I'll try it again, because I didn't find it yet.
I have to create some indexes in a production database.
I have a doubt.
Do I need to Compute Statistics after creating indexes?
Or when I create they automatically are computed?
Thanks for any help.
The version I'm using is:
Oracle Database 10g Release 10.2.0.5.0 - 64bit Production
PL/SQL Release 10.2.0.5.0 - Production
CORE 10.2.0.5.0 Production
TNS for 64-bit Windows: Version 10.2.0.5.0 - Production
NLSRTL Version 10.2.0.5.0 - Production

Petri BR wrote:
Good night, I tryed it before and got no help.
So I'll try it again, because I didn't find it yet.
I have to create some indexes in a production database.
I have a doubt.
Do I need to Compute Statistics after creating indexes?after CREATE INDEX what are the values for the index statistics?
Or when I create they automatically are computed?Just look at the statistics values after issuing CREATE INDEX & answer the question yourself!

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Compute Statistics after creating indexes

Hi, I have to create some indexes in a production database.
I have a doubt.
Do I need to Compute Statistics after creating indexes?
Or when I create they automatically are computed?
Thanks for any help.
Edited by: Petri BR on May 14, 2013 3:39 PM

Petri BR wrote:
Hi, I have to create some indexes in a production database.
I have a doubt.
Do I need to Compute Statistics after creating indexes?answer is version dependeent.
Or when I create they automatically are computed?answer depends upon which version of Oracle.
How do I ask a question on the forums?
SQL and PL/SQL FAQ
you should ALWAYS provide Oracle version to FOUR decimal places.
below is even better
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - Production
PL/SQL Release 11.2.0.2.0 - Production
CORE    11.2.0.2.0      Production
TNS for Linux: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - ProductionHandle:     Petri BR
Status Level:     Newbie
Registered:     Dec 10, 2007
Total Posts:     119
Total Questions:     29 (18 unresolved)
I extend to you my condolences; since you rarely get your questions answered here.

Part of imported image remain on computer screen after creating Page doc

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After creating index query is taking more

Hello all,
I am trying the following..and not getting why the query is taking more time after creating the index
SQL> SELECT distinct version_no
2 FROM iefloa_data_anal
3 WHERE datetime_inserted > to_date('17-02-2004','dd-mm-yyyy');
VERSION_NO
999
Elapsed: 00:00:22.16
Execution Plan
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=15 Card=1 Bytes=22)
1 0 SORT (UNIQUE) (Cost=15 Card=1 Bytes=22)
2 1 TABLE ACCESS (FULL) OF 'IEFLOA_DATA_ANAL' (Cost=2 Card=1
Bytes=22)
/*******************Here I am creating the Index************/
SQL> create index t_ind_date on iefloa_data_anal(datetime_inserted);
Index created.
Elapsed: 00:07:427.38
SQL> SELECT distinct version_no
2 FROM iefloa_data_anal
3 WHERE datetime_inserted > to_date('17-02-2004','dd-mm-yyyy');
VERSION_NO
999
Elapsed: 00:00:40.10
Execution Plan
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2 1 TABLE ACCESS (BY INDEX ROWID) OF 'IEFLOA_DATA_ANAL' (Cos
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can anybody explains whats the reason...
the table is having around 1.5 crore records
regards

The execution plan clearly shows that Oracle thinks only one row is going to match that condition on the index ("Card=1"). Is that a true statement? If not, you should make sure your stats are accurate. If the data is highly skewed, you may need to put a histogram on that column.
Another possibility is that the index is on much slower disks than the table. Although, I can't imagine any range scan on an index that has only one matching value taking that long. How about doing a full trace (SET AUTOTRACE ON) and posting the logical and physical i/o information?

COMPUTE STATISTICS caluse for database 10g with compatible parameter 9.2.0

Hello,
We have to use COMPUTE STATISTICS clause for index in oracle 9i and eariler.
But from oracle 10g we do not need to compute statistics after index creation.
I am using databse of oracle 10g R2 but my compatible paramtere is 9.2.0 then should I use COMPUTE STATISTICS for my index?
Can anyone explain?
Edited by: user10540254 on Dec 23, 2011 12:44 AM

use this :
using analyze table <table_name> compute statistics;

Database slow after Index compute statistics

Dear All,
Since 2 days back after executing Analyze Index compute objects to increase the response time some programs from my application have become very slow.
After seeing this behaviour I went ahead and did a Analyze table compute statistic again . Even after doing this the behaviour has remained the same . Some users have been complaining (becoz the slowness has effected only some tables and not the whole database).
I checked sys.v_$session_longops and got this output
OPNAME      TARGET     ELAPSED_SECONDS
NULL     53     596792483
NULL      53     596793670
¥Á     3248826740 596793669
NULL     53     596793624
NULL     NULL 596800369
NULL     1     596796740
NULL     1732526816     596472777
Table Scan     PO8.ACC_LEDGER      9
Table Scan     PO8.INVENTORY_LEDGER     26
Sort Output     NULL      7
Sort/Merge     NULL      15
Sort/Merge     NULL     66
Table Scan     PO8.INVENTORY_LEDGER     12
Table Scan     PO8.ACC_LEDGER     9
NULL     1725513472     0
NULL     3361240696     0
NULL     3361796632     0
NULL 22     596792484
NULL     1730819772     596800386
NBIAAT56020010ä     (stale) obj# 3363169460     596800605
ýÐ      3506279036     596799303
NULL      NULL     596800634
What could have happened.
In the ini I have set
optimizer mode = Choose
db_file_multiblock_read_count=     8
Sapna

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Instance Efficiency Percentages (Target 100%)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Soft Parse Ratio: 98.74
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Top 5 Wait Events
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db file sequential read 26,053 0 .00
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direct path read 244 0 .00
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DSO activation problem after creating the secondary indexes

Hi,
I am facing the problem with DSO activation after creating the secondary indexes.
Compared with Info Cubes there is no functionality available which allows dropping and recreating a secondary index before/after the data activation.
As a workaround I can write a simple report which drops and creates the indexes on database level.
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hi,
in BI if you are using the dso for reporting then you can simply chk the settings of dso for SID generation.
no need to create the indexes or delete it.
if the dso is not used for report then no need to use indexes.
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What is COMPUTE STATISTICS in index

Hi,
I need the explanations of compute statistics in index.
what is compute statistics?
Regards,
B.Prakash

Hi,
Compute statistics tells Oracle to collect statistics during the creation of the index. The statistics are then used by the optimizer to choose a "plan of execution" when SQL statements are executed.
Thanks

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Hi,
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San KTN wrote:
Hi Banka,
I suggest you to perform followings :-
1. Delete the table statistics first.
2. Create another table as select from this target table , in same schema and same tablespace.
3. exec dbms_stat.gather_table_stats with METHOD_OPT parameter value as
FOR ALL INDEXED COLUMNS SIZE n ( n is any number )
or FOR COLUMNS (Column list ... even if all columns in the list)
or NULL
on new and old table respectively.
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Hi,
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The contents of the generate_clt log are as below.
Schema will be created from the following containers:
obiawarehouse
Success!
>>>>>>>>>>>>>>>>>>>
and the content of the createwtables.log
=====================================
STD OUTPUT
=====================================
CREATING SIEBEL DATABASE OBJECTS
E:\oracle\product\10.2.0\OracleDB\DAC\bifoundation\dac\UTILITIES\BIN\DDLIMP /I N /s N /u hr /p ******* /c obia /G "SSE_ROLE" /f E:\oracle\product\10.2.0\OracleDB\DAC\bifoundation\dac/conf/sqlgen/ctl-file/oracle_bi_dw.ctl /b "" /K "" /X "" /W N
The Siebel Database Objects were created successfully.
=====================================
ERROR OUTPUT
=====================================
Siebel Enterprise Applications ODBC DDL Import Utility, Version 7.7 [18030] ENU
Copyright (c) 2001 Siebel Systems, Inc. All rights reserved.
This software is the property of Siebel Systems, Inc., 2207 Bridgepointe Parkway,
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User agrees that any use of this software is governed by: (1) the applicable
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E:\oracle\product\10.2.0\OracleDB\DAC\bifoundation\dac\UTILITIES\BIN\DDLIMP /I N /s N /u hr /p ***** /c obia /G SSE_ROLE /f E:\oracle\product\10.2.0\OracleDB\DAC\bifoundation\dac/conf/sqlgen/ctl-file/oracle_bi_dw.ctl /b /K /X /W N
Connecting to the database...
Connected.
Reading tables and indexes from DDL file...
Read 0 tables and 0 indexes from DDL file...
Reading existing schema...
Read 0 tablespaces, 0 tables and 0 indexes from existing schema...
Running SQL statements against the database...
TABLES CREATED : 0
TABLES GRANTED : 0
TABLES DELETED : 0
TABLES MERGED : 0
TABLES REBUILT : 0
TABLES IGNORED : 0
COLUMNS ADDED : 0
COLUMNS DELETED : 0
COLUMNS MODIFIED: 0
INDEXES CREATED : 0
INDEXES DELETED : 0
INDEXES MODIFIED: 0
TOTAL ERRORS : 0
Disconnecting from the database.
>>>>>>>>>>>>>>>>>>
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Hi,
We have run into a problem when trying to create spatial indexes. The problem seems to be that an mdsys-procedure tries to use a number with a comma as decimal symbol in an update statement
Error message:
ERROR at line 1:
ORA-29855: error occurred in the execution of ODCIINDEXCREATE routine
ORA-13249: internal error in Spatial index: [mdidxrbd]
ORA-13249: Error in Spatial index: index build failed
ORA-13249: Stmt-Execute Failure: begin mdsys.prvt_idx.execute_update(NULL,NULL,'set sdo_rtree_quality = 1,00000000 where UPPER(sdo_index_owner) = UPPER(''BK'') AND UPPER(sdo_index_name)=UPPER(''TEST_RTREE_IDX'') AND UPPER(sdo_index_table)=UPPER(''MDRT_8120$'')',NULL); end;
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ORA-06512: at line 1
ORA-06512: at "MDSYS.SDO_INDEX_METHOD_9I", line 7
ORA-06512: at line 1
Our problem seems to be identical to the one discussed in this thread: create RTREE falied on 9.2.0.4
Regional settings, language versions etc:
Client:
OS: Windows 2000
Regional options (OS): Swedish, Sweden
Sqlplus (console and windows versions): v 9.2.0.1.0
Registry: NLS_LANG =SWEDISH_SWEDEN.WE8MSWIN1252
Server:
OS: Windows Server 2003
Regional options (OS): Swedish, Sweden
Oracle: v 9.2.0.3.0
Registry: NLS_LANG =SWEDISH_SWEDEN.WE8MSWIN1252
We have also tried building the indexes after overriding these settings by setting the environment variables NLS_LANG=AMERICAN_AMERICA.WE8ISO8859P1 on both the client- and the server computer. This gives exactly the same error. We have tried setting NLS_NUMERIC_CHARACTERS to '.,' instead of ',.', but this does not help either.
We haven't tried changing the NLS_LANG registry entry on the server, because this is a production server at a customer's site that hosts several other databases, so we would prefer not to have to restart it if we can avoid it. However, as we understand it, the environment variable NLS_LANG should override the registry setting anyway, right?
We first experienced the problem when trying to build indexes on imported data. To verify that the problem was not with the data, we wrote a simple test script that:
1)Creates a table
2)Creates metadata
3)Inserts a simple geometry
4)Tries to create an index
The error message above is from running this script. We have verified that the script
works ok on another database server.
Below are the values of some of the language parameters right before running the script
(we have tried many other settings with the same result).
parameter...........................db................................instance...............session
NLS_CHARACTERSET.......WE8MSWIN1252..................................................
NLS_LANGUAGE...............AMERICAN...................AMERICAN...........AMERICAN
NLS_NCHAR_CH...............AL16UTF16 ..........................................................
NLS_NCHAR_CONV... ......FALSE..........................FALSE..................FALSE..
NLS_NUMERIC_CH...---------.,---------------------------------------------------------------.,
NLS_TERRITORY..............AMERICA......................AMERICA..............AMERICA
The guy who started the thread referenced above solved the problem, but we haven't been able to get it working by changing registry entries and session parameters.
The question is: Which setting will make the number in 'set sdo_rtree_quality = 1,00000000...' be generated with a . instead of a , as decimal symbol?

Ok, so here is my plan to solve this:
1) Change the default user locale (the language under "standards and formats") to English for the account under which the Oracle server runs.
2) Reboot (or is there an easier way to make Oracle reload the settings?)
This should make the index creation work. It may break something else however, so to avoid this I can set the user locale back to Swedish afterwards .
You can subsequently change the setting and update the sdo_rtree_quality in
the metadata and it should work fine. Do you mean I have to update the sdo_rtree_quality in some way to make it work after I have changed the default user locale back to Swedish? How do I do this?
Thanks a million both of you!

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Hi,
Nowadays, we are trying to configure TREX from a SAP system (creating indexes, queues, so on).
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<REMOVED BY MODERATOR>
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Edited by: Alvaro Tejada Galindo on Feb 15, 2008 3:06 PM

boyishcovenant wrote:
Currently, there is already an index on table A on column KEY. And there is already an index on table B on column KEY. So I won't be adding a new index per say, but modifying the way these 2 indexes are set up.
I am using Oracle 9.2. Stats are up to date. It's not statistics issue. The execution plan I posted in the original post shows the Delete is already doing index range scans nested loop anti join.Yes, and i would expect it to be doing a hash anti join and not a nested loops anti join given the volume of data you say you are dealing with.
boyishcovenant wrote:
I think that it is spending too much time in doing the anti join with "NOT IN". I believe 95% of the data is "IN", if you know what I mean. Hence, if I had an index that already does the computation of what is "NOT IN" table B, then there won't be the need to do that anti join.That's really a design issue, and you're adamant you can't alter the design ... so ....
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Compute Statistics after create a index

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