RE: HOW TO: fudge histogram information
- From: "Lex de Haan" <lex.de.haan@xxxxxxxxxxxxxx>
- To: <GLeonard@xxxxxxxxxxxxx>
- Date: Tue, 15 Feb 2005 13:37:39 +0100
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.
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-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Leonard, George
Sent: Tuesday, February 15, 2005 13:30
To: oracle-l@xxxxxxxxxxxxx
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
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Oracle Database Administrator
New Dawn Technologies @ Wesbank
E-mail:gleonard@xxxxxxxxxxxxx
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