At least on my DB's doing ALTER INDEX <index_name> REBUILD does in fact
populate the statistics.
I discovered this by accident on one RBO DB which started giving poor
performnce after doing some
REBUILDs (OPTOMIZER_MODE=CHOOSE).
ora ak
<ora_magic@yahoo. To: Multiple recipients of list
ORACLE-L <[EMAIL PROTECTED]>
com> cc:
Sent by: Subject: Re: Difference - Rebuild and
Analyze index
[EMAIL PROTECTED]
10/16/2002 08:49
AM
Please respond to
ORACLE-L
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 <[EMAIL PROTECTED]> 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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