RE: When to rebuild the index?

Just my opinion - I've learned to be skeptical of anything I read on that site. Tom Kyte, Jonathan Lewis and the rest of the Oak Table would probably agree. I can only recommend that you test things for yourself and avoid compulsive maintenance - that is, you should only do something (e.g. rebuild an index) if there is a measurable positive result, otherwise you're wasting resources that could be better spent elsewhere. So, you could count me in the group that Don describes as those who "maintain that Oracle indexes should "rarely" be rebuilt."

-----Original Message-----

From: Chirag DBA [mailto:chiragdba_at_gmail.com] Sent: Tuesday, September 06, 2005 11:23 AM To: Allen, Brandon
Cc: Oracle-L Freelists
Subject: Re: When to rebuild the index?

Hi,  

http://www.dba-oracle.com/art_dbazine_idx_rebuild.htm  

Here is the very good document for indexes.  

I just found that.  

Regards - Chirag  

On 9/6/05, Chirag DBA < chiragdba_at_gmail.com> wrote:

Sure.. I thouht I miss to configure something.  

Let me do this and if I will come across something like this, I will be more than happy to share with you guys.  

Thank you,  

Regards - Chirag  

On 9/6/05, Allen, Brandon < <mailto:Brandon.Allen_at_oneneck.com> Brandon.Allen_at_oneneck.com> wrote:

I know - it's kind of a pain. Search Metalink for index_stats and you should find a script that you can run which will create a stored procedure and generate a secondary script to run validate structure on each index and then insert the values from index_stats into a secondary table, e.g. all_index_stats.

-----Original Message-----

From: oracle-l-bounce_at_freelists.org [mailto: oracle-l-bounce_at_freelists.org]On Behalf Of Chirag DBA Sent: Tuesday, September 06, 2005 10:07 AM To: Chirag DBA
Cc: Oracle-L Freelists
Subject: Re: When to rebuild the index?

While you do the validate structure with indexes, it shows the stats only for the last index.  

How can I see the list of all the indexes who needs to get rebuild now.  

I can see the results only for 1 index and that is the last one in valudate structure.  

Regards - Chirag  

On 9/6/05, Chirag DBA < chiragdba_at_gmail.com <mailto:chiragdba_at_gmail.com> > wrote:

Hi Guys,  

I think that even select statement will make the index split and require the rebuilding. Am I true? I think I am.  

And there is a view called index_stats with column height.  

I have read that when the value of this column is >= 4, u need to rebuild the indexes. But after analyzing the particular schema, I don see any value to get populated in this view.  

I can see last analyzed value changed in dba_indexes when I analyze the schema with DBMS_STATS. ANALYZE_SCHEMA package.  

Why this is so?  

Regards - Chirag  

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