Solved

How to automate index rebuilds online in Oracle 10.2.0.2

Posted on 2008-06-12
2
301 Views
Last Modified: 2013-12-19
Is there a way to set up monitoring of index pct used and kick off an online rebuild of the index when the 20% threshold is met.

what happens is a session spawns multiple inserts, deletes and updates on tables to set up a "data scenario" that the application uses.  When the application has completed the java framework on the app side spawns an additional sqlid that deletes all the data for the scenario and replaces it with the original data before the session.  Each time (hundreds of times a day) after the session closes the indexes on these tables (some are 3mm + rows) are not usable due to the massive dml changes.  The next user runs another session and everything is going full table scan and the performance is terrible.

Any ideas how to deal with this?

thanks
0
Comment
Question by:mjimison1956
2 Comments
 
LVL 47

Accepted Solution

by:
schwertner earned 500 total points
ID: 21769736
Yes it is possible. You have to define where it is the value you use to trigger.



PROCEDURE rebuild_ind IS
   v_sql VARCHAR2(890);
FOR i IN (SELECT * FROM dba_indexes) LOOP

    IF  pct_free < 20 THEN
     v_sql :=  'ALTER INDEX ' || i.owner ||'.'||i.index_name || ' rebuild';
     execute immediate v_sql;

    END IF;

END LOOP;

EXCEPTION
WHEN OTHERS
    .....

END;

Some clarification should be done.
This procedure cold be run every 20 minutes (DBMS_JOB, DBMS_SCHEDULE packages) or
when application finishes.
0
 
LVL 34

Expert Comment

by:johnsone
ID: 21769817
After loading large amounts of data are the tables being analyzed?  That could account for your performance issues.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Subquery in Oracle: Sub queries are one of advance queries in oracle. Types of advance queries: •      Sub Queries •      Hierarchical Queries •      Set Operators Sub queries are know as the query called from another query or another subquery. It can …
Truncate is a DDL Command where as Delete is a DML Command. Both will delete data from table, but what is the difference between these below statements truncate table <table_name> ?? delete from <table_name> ?? The first command cannot be …
Via a live example show how to connect to RMAN, make basic configuration settings changes and then take a backup of a demo database
This video shows how to Export data from an Oracle database using the Datapump Export Utility.  The corresponding Datapump Import utility is also discussed and demonstrated.

911 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now