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RE: Long-running SQL

From: <Cherie_Machler_at_gelco.com>
Date: Wed, 27 Mar 2002 08:39:46 -0800
Message-ID: <F001.00434ED4.20020327083946@fatcity.com>

Lisa,

I'm not positive that it is actually using the index. This load ran last night so I was not able to trace as it happened. Following is the explain plan that Precise monitoring tool states that it should have used:

Count (stopkey)

     Table access (by index rowid) EDM_DBO.EXP_COST_CENTER_DIM
          Index (range scan) EDM_DBO.EXP_COST_CENTER_DIM_IDX1

If I have to, I will get up tonight and do a trace.

There are 998 unique values for account number column out of about 365,000 rows.

This statement has always been bad and caused problems for the load. Since I could never recommend
an improvement for it, I just looked at other things. However, the nightly loads have been running outside
the window now with an increase in amount of data loaded and things are now at a crisis point.

Thanks,

Cherie

                                                                                                                      
                    "Koivu, Lisa"                                                                                     
                    <lisa.koivu_at_efair       To:     "'ORACLE-L_at_fatcity.com'" <ORACLE-L_at_fatcity.com>,                  
                    field.com>               "'cherie_machler_at_gelco.com'" <cherie_machler_at_gelco.com>                  
                                            cc:                                                                       
                    03/27/02 10:16 AM       Subject:     RE: Long-running SQL                                         
                                                                                                                      
                                                                                                                      




Hi Cherie,
do you know for sure it is using the index? Have you traced it? Can you post the explain plan? What's the cardinality of account_number in this table?

I can just hear those people over there screaming at you saying it's your problem...

Lisa Koivu
Oracle Database Administrator
Fairfield Resorts, Inc.
954-935-4117

> -----Original Message-----
> From: Cherie_Machler_at_gelco.com [SMTP:Cherie_Machler_at_gelco.com]
> Sent: Wednesday, March 27, 2002 9:33 AM
> To: Multiple recipients of list ORACLE-L
> Subject: Long-running SQL
>
>
> 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
>
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author:
> INET: Cherie_Machler_at_gelco.com
>
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-- 
Author: 
  INET: Cherie_Machler_at_gelco.com

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Received on Wed Mar 27 2002 - 10:39:46 CST

Original text of this message

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