| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
 |
 | |||
| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
|
| |||
Home -> Community -> Mailing Lists -> Oracle-L -> RE: Rebuild Indexes
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=25000000;". This do it faster.
Grettings.
-----Mensaje original-----
De: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] En
nombre de Richard Foote
Enviado el: viernes, 13 de febrero de 2004 14:59
Para: oracle-l_at_freelists.org
Asunto: Re: Rebuild Indexes
When to rebuild indexes, hummm, this is all rather new and exciting ;)
Juan, I notice with interest that your script:
Running such a script on our production databases at my current site would:
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
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.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++=+++
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);
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<=3Ddecode(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('@c:\reb_index2.sql');
END;
/
spool off
@c:\reb_index1.sql
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++=+++
-----Mensaje original-----
De: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] =
En
nombre de vidya kalyanaraman
Enviado el: viernes, 13 de febrero de 2004 9:46
Para: oracle-l_at_freelists.org
Asunto: Rebuild Indexes=20
Hi
It may be a silly thing to ask, but I am stuck right now.=20
I have been given a task to find out the indexes which need to be=20
rebuilt. There are around 3000 Indexes. I know I can run the following =
command
"analyze index <Index> VALIDATE STRUCTURE " =20
for a single index and then find the rows from index_state based on=20
del_lf_rows_len/lf_rows_len > 20%. =20
Does anyone have a script for dynamically finding out the indexes that=20
are the candidates for rebuilding? How do you normally handle=20
situations like this?
TIA
Vidya
-- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request_at_freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request_at_freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request_at_freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------Received on Tue Feb 17 2004 - 04:41:02 CST
 |
 |