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Home -> Community -> Mailing Lists -> Oracle-L -> [oracle-l] Re: Index block count
Tom,
You say the blevel is 2. At the risk of stating the obvious, are stats up to date? Have you loaded any data recently?
Mark J. Bobak
Oracle DBA
ProQuest Company
Ann Arbor, MI
"Imagination was given to man to compensate him for what he is not, and
a sense of humor was provided to console him for what he is." --Unknown
-----Original Message-----
From: Terrian, Tom (Contractor) (DAASC) [mailto:Tom.Terrian_at_dla.mil]=20
Sent: Tuesday, January 27, 2004 4:08 PM
To: 'oracle-l_at_freelists.org'
Subject: [oracle-l] Index block count
I have a b-tree, unique, local, prefixed, range partitioned index. The
blevel
on all of the partitions is 2. There are no chained/migrated rows in
the table.
=20
I have a query that selects 1 record and only uses the index. I am not
sure why
the query uses 4 blocks. I would think that it would just have to use 1
for the
branch block and 1 for the leaf block. Can someone explain it to me?
(I have
run the query 8,000 times and the average blocks per execution is 4.1)
Thanks,
Tom
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