Eva,
Don't know if the problem is only 3 out of 4 parts of the composite index
are used so it can't work out how many distinct values there are of the
first three parts only (are you able to try creating an index with only the
3 parts to see what would happen)?
Iain Nicoll
-----Original Message-----
Sent: 14 January 2003 14:49
To: Multiple recipients of list ORACLE-L
Hello,
Thanks for the replies
Here is the description of the table and the indexes, pls remember I have
removed and tested each index seperately, still insisted on a Full search. 9
indexes is not my idea of a perfect situation these are created by the
developers ( another company) so politics plays a big roll here.
CREATE TABLE FWEPCODE1 (
RECORDID INTEGER NOT NULL,
FUNC VARCHAR2 (20),
WOTYPE VARCHAR2 (20),
EXP VARCHAR2 (20),
PIK VARCHAR2 (20),
FUNCDESC VARCHAR2 (80),
EXPDESC VARCHAR2 (80),
PIKDESC VARCHAR2 (80),
EX1 VARCHAR2 (1),
EX2 VARCHAR2 (10),
EX3 VARCHAR2 (10),
EX4 VARCHAR2 (10),
EX5 VARCHAR2 (10),
EX6 VARCHAR2 (10),
EX7 VARCHAR2 (10),
EX8 VARCHAR2 (10),
EX9 VARCHAR2 (10),
EX10 VARCHAR2 (10) ) ;
FWEPCODE1_NDX1 ON FWEPCODE1(FUNC, WOTYPE, EXP, PIK);
FWEPCODE1_NDX2 ON FWEPCODE1(FUNC);
FWEPCODE1_NDX3 ON FWEPCODE1(EXP);
FWEPCODE1_NDX4 ON FWEPCODE1(FUNC, WOTYPE);
FWEPCODE1_NDX5 ON FWEPCODE1(FUNC, EX2);
FWEPCODE1_NDX6 ON FWEPCODE1(EXPDESC);
FWEPCODE1_NDX7 ON FWEPCODE1(FUNC, WOTYPE, PIK);
FWEPCODE1_NDX8 ON FWEPCODE1(RECORDID);
FWEPCODE1_NDX9 ON FWEPCODE1(WOTYPE, FUNC, EXP);
I have added a CSV file as an attachment as requested by one lister of the
plan_table.
Once again appreciation for all the help.
Regards
Denham
-----Original Message-----
Sent: Tuesday, January 14, 2003 3:24 PM
To: Multiple recipients of list ORACLE-L
Eva,
Is there an index on the fwepcode1 table with the three columns used in the
where clause? Are the three columns varchar or varchar2? Make sure the EXP
column is not a number!
Secondly, I think I would change the query as follows:
SELECT DISTINCT (1)
FROM fwepcode1
WHERE (wotype = 'TST' AND func = 'C0NEPRF' AND EXP = '22222')
OR not exists(select 1 FROM valuelist
WHERE listname = 'STATUS'
AND MAXVALUE = 'AAAAA'
AND VALUE='INPRG' )
Tom Mercadante
Oracle Certified Professional
-----Original Message-----
Sent: Tuesday, January 14, 2003 6:29 AM
To: Multiple recipients of list ORACLE-L
Hello List,
Pls help me on this problem. Our application does a validation when it uses
a certain screen, as it so happens this screen is used very intensively. The
performance is very slow, I have isolated the main culprit. I have tried the
following.
I have dropped all the indexes and tried recreating them individually. Each
time I have run an explain plan on the query, the optimizer (both rule and
Choose) have chosen to do a FULL table scan on the fwepcode table. Even when
using a hint to explicitly use the index it still uses FULL.
This is very frustrating indeed.
SELECT DISTINCT (1)
FROM fwepcode1
WHERE (wotype = 'TST' AND func = 'C0NEPRF' AND EXP = '22222')
OR 'INPRG' NOT IN (SELECT VALUE
FROM valuelist
WHERE listname = 'STATUS'
AND MAXVALUE = 'AAAAA')
Is the reason that the optimizer does not use any of the indexes because of
the SELECT DISTINCT (1)?
I have tried adjusting this query slightly to remove this and it still
insists on doing a full table scan.
Funny enough the sub query on valuelist table does use a index.
The table contains 8920 rows. The cost according to the explain plan is 703
and bytes 9834.
The system is a Oracle 817 on Win2k.
Pls advise, any options or help will be appreciated.
Many Thanks
Denham Eva
Oracle DBA
"UNIX is basically a simple operating system, but you have to be a genius to
understand the simplicity."
Dennis Ritchie.
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