RUNNING IB-SPDB VERY SLOW (Doc ID 1678670.1)

Last updated on OCTOBER 26, 2022

Applies to:

Symptoms

ACTUAL BEHAVIOR
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Interval Data Set Derivation process runs every night and run times have been increasing and coming into business hrs. While we know that sites are growing this job should be scalable.

As an example

The following sql has been run 831 times clocking up an average of 4.1 million buffer gets per execution and
a total of 3.4 billion buffer gets. This accounts for a lot of cpu usage.


Problem sql triggered from IB-SPDB (Interval Data Set Derivation)


3,381,216,091 4,068,852 3,572 4 831 831
JDBC Thin Client CISUSER 0 2014-04-01/01:20:55 ALL_ROWS
00000000B1768CB8
SELECT MIN(CB1.REG_DATA_DTTM), MIN(CB1.REG_DATA_DTTM) + ( :1/1440) FROM CI_REG_DATA_SET CA1, CI_REG
_DATA CB1 WHERE CA1.REG_ID = :2 AND CA1.REG_DATA_SET_ID = CB1.REG_DATA_SET_ID AND CA1.REG_DS_STATUS
_FLG = 'C' AND CB1.REG_DATA_DTTM > :3 AND CB1.REG_DATA_DTTM REG_DS_TYPE_FLG <> :6 AND NOT EXISTS (SELECT 'x' FROM CI_REG_DATA_SET CA11, CI_REG_DATA CB11 WHERE
CA11.REG_ID = CA1.REG_ID AND CB11.REG_DATA_DTTM = CB1.REG_DATA_DTTM AND CA11.REG_DATA_SET_ID = CB11.
REG_DATA_SET_ID AND CA11.REG_DS_STATUS_FLG = 'C' AND CA11.SET_DTTM CA1.SE
T_DTTM ) AND CB1.REG_DATA_DTTM + ( :8/1440) A2, CI_REG_DATA CB2 WHERE CA2.REG_ID = :10 AND CA2.REG_DATA_SET_ID = CB2.REG_DATA_SET_ID AND CA2.RE
G_DS_STATUS_FLG = 'C' AND CB2.REG_DATA_DTTM > :11 AND CB2.REG_DATA_DTTM   :13 AND CA2.REG_DS_TYPE_FLG <> :14 AND NOT EXISTS (SELECT 'x' FROM CI_REG_DATA_SET CA22, CI_REG_D


STEPS
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The issue can be reproduced at will with the following steps:
Interval Data Set Derivation process runs every night and run times have been increasing.

Changes

Cause

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