Cherie,
At least the leading column in your index doesn't have an index-killing
function on it in the Where clause - the NVL function on the other columns
makes Oracle not use them for hitting the index.
Since you're only interested in returning a single value, perhaps a stored
function that returns that value and takes :b1 - :b9 as input arguments
could be tuned to be faster. It could be used in the SQL Select. Check out
the docs for the use of stored functions in SQL statements.
Jack
--------------------------------
Jack C. Applewhite
Database Administrator/Developer
OCP Oracle8 DBA
iNetProfit, Inc.
Austin, Texas
www.iNetProfit.com
[EMAIL PROTECTED]
(512)327-9068
-----Original Message-----
[EMAIL PROTECTED]
Sent: Wednesday, March 27, 2002 8:33 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: Jack C. Applewhite
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