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RE: slowish query causing problems...

From: Denham Eva <EvaD_at_TFMC.co.za>
Date: Tue, 14 Jan 2003 06:49:19 -0800
Message-ID: <F001.0052F188.20030114064919@fatcity.com>


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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Author: Denham Eva
  INET: EvaD_at_TFMC.co.za

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Received on Tue Jan 14 2003 - 08:49:19 CST

Original text of this message

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