Oracle-L: RE: Long-running SQL

From: Khedr, Waleed <Waleed.Khedr_at_FMR.COM>
Date: Wed, 27 Mar 2002 13:39:11 -0800
Message-ID: <F001.004354E0.20020327133911@fatcity.com>

Cherie,

Are you calling this sql for every row in the load job? If the answer = Yes
then my advice will be bulk loading in temporary table and joining the temp table with your dim using a Hash/join to load the target table. Do full table scan from the dim table for the join.

Regards,

Waleed

-----Original Message-----
Sent: Wednesday, March 27, 2002 9:33 AM
To: Multiple recipients of list ORACLE-L

We have a statement that I feel takes too long to run in a nightly data load.
The table it runs against has 386,000 records. It runs for about 10 seconds
on average. We're only loading about 50,000 records a night but this statement
is running during the majority of the 9-hour load time. This is causing the
load to run longer than our allowable window and causing me untold headaches.
If anyone has any suggestions to make this run faster, I'd be greatly appreciative.

The columns in the where statement are all part of an index. However, the functions on the columns add additional execution time and complexity.

This is an 8.0.4 database so I can not make this a function-based index.

I put this in a couple of SQL tuning tools and came up with no valid alternatives.
I can't help thinking that the statement could be rewritten into a couple of statements
so that it would be more efficient. However, I'm not skilled enough with SQL to
do it. Perhaps someone else is. Here's the code.

SELECT /*+ INDEX(EXP_COST_CENTER_DIM EXP_COST_CENTER_DIM_IDX1) + */ EXP_COST_CENTER_KEY
FROM EXP_COST_CENTER_DIM

     WHERE ACCOUNT_NUMBER = :b1 AND
          NVL(ORG_LEVEL_1_VALUE,'NONE') = NVL(:b2,'NONE') AND
          NVL(ORG_LEVEL_2_VALUE,'NONE') = NVL(:b3,'NONE') AND
          NVL(ORG_LEVEL_3_VALUE,'NONE') = NVL(:b4,'NONE') AND
          NVL(ORG_LEVEL_4_VALUE,'NONE') = NVL(:b5,'NONE') AND
          NVL(ORG_LEVEL_5_VALUE,'NONE') = NVL(:b6,'NONE') AND
          NVL(ORG_LEVEL_6_VALUE,'NONE') = NVL(:b7,'NONE') AND
          NVL(ORG_LEVEL_7_VALUE,'NONE') = NVL(:b8,'NONE') AND
          NVL(ORG_LEVEL_8_VALUE,'NONE') = NVL(:b9,'NONE') AND

ROWNUM = 1 SQL> desc exp_cost_center_dim

 Name                            Null?    Type
 ------------------------------- -------- ----
 EXP_COST_CENTER_KEY             NOT NULL NUMBER(7)
 ACCOUNT_NUMBER                  NOT NULL NUMBER(9)
 BATCH_WINDOW_DATE_KEY           NOT NULL NUMBER(5)
 ORG_LEVEL_1_VALUE                        VARCHAR2(20)
 ORG_LEVEL_2_VALUE                        VARCHAR2(20)
 ORG_LEVEL_3_VALUE                        VARCHAR2(20)
 ORG_LEVEL_4_VALUE                        VARCHAR2(20)
 ORG_LEVEL_5_VALUE                        VARCHAR2(20)
 ORG_LEVEL_6_VALUE                        VARCHAR2(20)
 ORG_LEVEL_7_VALUE                        VARCHAR2(20)
 ORG_LEVEL_8_VALUE                        VARCHAR2(20)
 DATA_SOURCE_MOD_DATETIME        NOT NULL DATE
 DATA_WAREHOUSE_MOD_DATETIME     NOT NULL DATE
 DATA_MART_MOD_DATETIME          NOT NULL DATE

SQL> select column_name from dba_ind_columns where index_name ='EXP_COST_CENTER_D
IM_IDX1'; COLUMN_NAME

ACCOUNT_NUMBER

ORG_LEVEL_1_VALUE
ORG_LEVEL_2_VALUE
ORG_LEVEL_3_VALUE
ORG_LEVEL_4_VALUE
ORG_LEVEL_5_VALUE
ORG_LEVEL_6_VALUE
ORG_LEVEL_7_VALUE
ORG_LEVEL_8_VALUE

SQL> select column_name from dba_ind_columns where index_name ='EXP_COST_CENTER_D
IM_PK';

COLUMN_NAME

EXP_COST_CENTER_KEY Thanks,

Cherie Machler
Oracle DBA
Gelco Information Network

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Author: Khedr, Waleed
INET: Waleed.Khedr_at_FMR.COM

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