Oracle-L: Re: Difference - Rebuild and Analyze index

From: Marul Mehta <marul_at_zycus.com>
Date: Wed, 16 Oct 2002 22:58:39 -0800
Message-ID: <F001.004EBA7A.20021016225839@fatcity.com>

Thanks a lot John, Darshan ad Ora for clearing my confusions. I guess now i have a better understanding of which option to use and when to use.

Thanks buddies,
Marul.

Original Message ----- From: ora ak To: Multiple recipients of list ORACLE-L Sent: Wednesday, October 16, 2002 9:19 PM Subject: Re: Difference - Rebuild and Analyze index

Yes Marul , I think there is a big differenece in them . When you are rebulding the index means you are re-organzing the entries in the index , may be removing the entries for the rows deleted in past and so forth so on. But this doesn't generate any statistics about index.

When you analyze index, you generate information ( statistics) about the data in index , like leaf blocks or depth of index etc.

None of these should require orther , but they have some effect .

Like if you rebuild index , after that you dont have latest statistics and queries may not perform upto mark .

-oramagic

Marul Mehta <marul_at_zycus.com> wrote:

Hi,

Can anybody please tell me the difference between -

SQL > execute DBMS_UTILITY.ANALYZE_SCHEMA('BLAH','COMPUTE',NULL,30,'FOR ALL INDEXES'); and
SQL > select 'ALTER INDEX ' || INDEX_NAME || ' REBUILD ONLINE;' from USER_INDEXES

If I execute any one the above do i need to execute the other also?

After how many days/hour it should be executed.

TIA,
Marul.

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Author: Marul Mehta
INET: marul_at_zycus.com

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