RE: HOW TO: fudge histogram information

From: Lex de Haan <lex.de.haan_at_naturaljoin.nl>
Date: Tue, 15 Feb 2005 13:37:39 +0100
Message-Id: <20050215123743.BEF01975963@ha-smtp1.tiscali.nl>

why don't you export the table data, update the column, gather statistics, and then import back the original data?
otherwise, you have to update the dictionary. with a column population of two distinct values, you typicvally get two buckets with the cumulative cardinality
-- so you only have to change one of the two endpoint_number values (which is
unsupported, of course)

kind regards,

Lex.

Visit my website at http://www.naturaljoin.nl

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

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Leonard, George
Sent: Tuesday, February 15, 2005 13:30
To: oracle-l_at_freelists.org
Subject: HOW TO: fudge histogram information

Hi all

I need to change oracle idea of what the data looks like in a column that is indexes. Currently when the column is analyzed there are 2 values with a 50/50 split. (STATUS=OPEN or CLOSE)

I need to lie to it so that it thinks there are less than 5% open compared to closed so that it accesses the data via the index and not a table scan.

George

George Leonard
Oracle Database Administrator
New Dawn Technologies @ Wesbank
E-mail:gleonard_at_wesbank.co.za

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http://www.freelists.org/webpage/oracle-l Received on Tue Feb 15 2005 - 07:40:34 CST