 | | | Rebuild Indexes | Rebuild Indexes 2004-02-17 - By Juan Miranda
Hi
May script do just original post (vidya kalyanaraman) as for.
No more.
May be is not adecuate for your system.
Anyway you can stop it when you want: a simple CTRL+C.
In my mail I say:
"Take care in production because VALIDATE STRUCTURE do some tipe of lock. "
I have a very busy database and I execute this script very care and control.
I do it once a year and this reduced to 1/3 the space ocupied by indexes.
I will no discuss if it is good or not to rebuild indexes but...
Oracle Performance Tuning Manual 12-12:
"You sould rebuild your indexes regularly. However, this can be a
time-consuming task, especially if the base table es very large. "
Sorry if it caused problems in your system but ask Oracle for a better
rebuild method, not me.
I forgot to add an "alter session set SORT_AREA_SIZE%000000; ". This
do it faster.
Grettings.
-- --Mensaje original-- --
De: oracle-l-bounce@(protected) [mailto:oracle-l-bounce@(protected)] En
nombre de Richard Foote
Enviado el: viernes, 13 de febrero de 2004 14:59
Para: oracle-l@(protected)
Asunto: Re: Rebuild Indexes
When to rebuild indexes, hummm, this is all rather new and exciting ;)
Juan, I notice with interest that your script:
- performs an analyze validate structure on all indexes
- rebuilds all indexes if guilty of having more than 2 levels
- rebuilds all indexes with more than 10% deleted rows
Running such a script on our production databases at my current site would:
- cripple performance for up to approximately 14 hours (depending on
database) performing just the analyze step
- rebuild every single one of our larger, 3+ level indexes (don 't want
to think about the cost of this)
for practically *no* benefit.
The 3+ criteria does "accidentally " rebuild the handful we 've identified as
being candidates for an occasional rebuild but boy, what an incredible price
to pay !!
I think not ...
Richard Foote
-- -- Original Message -- --
From: "Juan Miranda " <j.miranda@(protected) >
To: <oracle-l@(protected) >
Sent: Friday, February 13, 2004 7:14 PM
Subject: RE: Rebuild Indexes
Hi
Try this.
This do not use a cursor so you can stop it when you what.
Take care in production because VALIDATE STRUCTURE do some tipe of lock.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-- Juan Miranda Sermática 06/AGO/2002
-- Utiliza VALIDATE STRUCTURE - > OJO en producción. Puede generar errores
ORA-00054 (See ORA-00054.ora-code.com).
-- OJO nolog - > NO usar con stand by
set serveroutput on size 1000000
set pagesize 0
set feedback off
set echo off
set trimspool on
spool c:\reb_index1.sql
DECLARE
dbname varchar2(20);
wday varchar2(11);
BEGIN
dbms_output.put_line( 'set echo off ');
dbms_output.put_line( 'set feedback off ');
dbms_output.put_line( 'set head off ');
dbms_output.put_line( 'spool c:\reb_index2.sql ');
dbms_output.put_line( 'prompt set feedback on ');
dbms_output.put_line( 'prompt set echo on ');
dbms_output.put_line( 'prompt spool c:\reb_index2.log ');
FOR t IN (select owner, index_name from dba_indexes where owner not in
( 'SYS ', 'SYSTEM ') order by owner,index_name) LOOP
dbms_output.put_line( 'prompt --Analizando
'||t.owner|| '. '||t.index_name);
dbms_output.put_line( 'Analyze index '||t.owner|| '. '||t.index_name|| '
validate structure; ');
dbms_output.put_line( 'select ' || ' ' ' ' || 'Alter index ' || t.owner ||
'. ' || t.index_name || ' rebuild online; ' || ' ' ' '|| ' from index_stats where
(height > 2) or
(10 <=decode(lf_rows_len,0,NULL,((del_lf_rows_len/lf_rows_len)*100))); ');
END LOOP;
dbms_output.put_line( 'prompt spool off ');
dbms_output.put_line( 'spool off ');
dbms_output.put_line( '@(protected):\reb_index2.sql ');
END;
/
spool off
@(protected):\reb_index1.sql
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-- --Mensaje original-- --
De: oracle-l-bounce@(protected) [mailto:oracle-l-bounce@(protected)] En
nombre de vidya kalyanaraman
Enviado el: viernes, 13 de febrero de 2004 9:46
Para: oracle-l@(protected)
Asunto: Rebuild Indexes
Hi
It may be a silly thing to ask, but I am stuck right now.
I have been given a task to find out the indexes which need to be
rebuilt. There are around 3000 Indexes. I know I can run the following
command
"analyze index <Index > VALIDATE STRUCTURE "
for a single index and then find the rows from index_state based on
del_lf_rows_len/lf_rows_len > 20%.
Does anyone have a script for dynamically finding out the indexes that
are the candidates for rebuilding? How do you normally handle
situations like this?
TIA
Vidya
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