Incorrect index used when executing a SELECT with HINT INDEX functionality in Openaccess 8.1.

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Title	Incorrect index used when executing a SELECT with HINT INDEX functionality in Openaccess 8.1.

URL Name	Incorrect-index-used-when-executing-a-SELECT-with-HINT-INDEX-functionality-in-Openaccess-8-1

Article Number	000178340

Environment	Product: Openaccess SDK Version: 8.1 build 0049 OS: Windows Database: All supported databases Application: All supported applications

Question/Problem Description

When executing a SELECT statement with HINT INDEX functionality in Openaccess 8.1, the incorrect index is used.

Steps to Reproduce

Clarifying Information

Index information of involved table :

ISQL> SELECT * FROM OA_STATISTICS WHERE TABLE_NAME='PORTFOLIOGROUP';

TABLE_QUALIFIER TABLE_OWNER TABLE_NAME NON_UNIQUE INDEX_QUALIFIER INDEX_NAME OA_TYPE SEQ_IN_INDEX COLUMN_NAME OA_COLLATION
OA_CARDINALITY OA_PAGES FILTER_CONDITIONS

SCHEMA OAUSER PORTFOLIOGROUP 0 NULL 0 1 1 FundCode A NULL NULL
SCHEMA OAUSER PORTFOLIOGROUP 0 NULL 0 1 2 PortfolioCode A NULL NULL
SCHEMA OAUSER PORTFOLIOGROUP 0 NULL 0 1 3 Code A NULL NULL
SCHEMA OAUSER PORTFOLIOGROUP 0 NULL 1 1 1 FundCode A NULL NULL
SCHEMA OAUSER PORTFOLIOGROUP 0 NULL 1 1 2 Code A NULL NULL
SCHEMA OAUSER PORTFOLIOGROUP 0 NULL 1 1 3 PortfolioCode A NULL NULL
SCHEMA OAUSER PORTFOLIOGROUP 0 NULL 2 1 1 GroupHoldsTrans A NULL NULL
SCHEMA OAUSER PORTFOLIOGROUP 0 NULL 2 1 2 FundCode A NULL NULL
SCHEMA OAUSER PORTFOLIOGROUP 0 NULL 2 1 3 PortfolioCode A NULL NULL
SCHEMA OAUSER PORTFOLIOGROUP 0 NULL 2 1 4 Code A NULL NULL

Query using hint index(2):
SELECT * FROM PORTFOLIOGROUP WHERE fundcode='01' and PortfolioCode='CSF' AND Code='01' HINT INDEX(PORTFOLIOGROUP."2")

Clarification:
First column on index(2) is GroupHoldsTrans (SEQ_IN_INDEX is 1) and not available in the given WHERE condition.
This results in falling back to the default behavior which is index(0) being used.

Error Message

Defect Number

Enhancement Number

Cause

The column in the WHERE condition is not available in the hinted INDEX.

Resolution

This is expected behavior.

Workaround

Notes

If there is *no* INDEX available which has a column from the WHERE clause defined as the first column (SEQ_IN_INDEX is 1), no INDEX is being used.

E.g. :

Following Select doesn't use an INDEX in above sample :
select * FROM PORTFOLIOGROUP WHERE PortfolioCode='CSF' and Code='01'

Last Modified Date	11/15/2016 8:42 AM

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Incorrect index used when executing a SELECT with HINT INDEX functionality in Openaccess 8.1.

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