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Oracle 8.1.7 statistics problem [message #225029]

Fri, 16 March 2007 11:44

zoltanp
Messages: 58
Registered: March 2005
Location: Hungary

Member

I have a partitioned table in our database.
I'm not able to create a usable statistics on this table,
becouse with statistics the optimizer not use the indexes.
When i delete statistics everything is OK.

Thanks,
Zolt�n Patalenszki

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Re: Oracle 8.1.7 statistics problem [message #225030 is a reply to message #225029]

Fri, 16 March 2007 11:50

Mahesh Rajendran
Messages: 10708
Registered: March 2002
Location: oracleDocoVille

Senior Member
Account Moderator

How did you collect the stats.
Post the exact statement.

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Re: Oracle 8.1.7 statistics problem [message #225038 is a reply to message #225030]

Fri, 16 March 2007 12:27

zoltanp
Messages: 58
Registered: March 2005
Location: Hungary

Member

That is my procedure:

CREATE OR REPLACE PROCEDURE Stati(p_sema VARCHAR2,
p_szazalek VARCHAR2, p_cpu VARCHAR2)
IS
v_verzio VARCHAR2(25);
v_mennyi NUMBER;
BEGIN
DBMS_STATS.gather_schema_stats(ownname=>p_sema,
estimate_percent=>p_szazalek, method_opt=> 'FOR ALL COLUMNS SIZE 1', DEGREE=>p_cpu,
CASCADE=>TRUE,
options=>'GATHER');
END;
/

Thanks,

Zolt�n Patalenszki

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Re: Oracle 8.1.7 statistics problem [message #225048 is a reply to message #225038]

Fri, 16 March 2007 14:29

Mahesh Rajendran
Messages: 10708
Registered: March 2002
Location: oracleDocoVille

Senior Member
Account Moderator

gather_schema_stats used have some bugs in 8i (could not recollect the exact bug).
try this for the concerned partitioned table.

exec dbms_stats.gather_table_stats('OWNER','TABLE_NAME',method_opt=>'FOR  ALL INDEXED COLUMNS SIZE 250',cascade=>'TRUE');

If this does not work
look into query. May the CBO is doing the right job (no need for index scan).

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