IC87251: RUNNING A SIMPLE QUERY THAT PERFORMS A HASH JOIN WITH PDQ ENABLED TAKES LONGER IN 11.70 THAN 11.50

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APAR status

  • Closed as program error.

Error description

  • Running the following query with pdq enabled creates a query
    plan with sequential scans and then a hash join to join the two
    tables.
    
    insert into TEMP_CURRARPSEQ
    SELECT --+USE_HASH(s)
    arp_seq_id,   arp_seq_cd, arp_pr_vid
    FROM sb_arp_seq_1 s, rc_arp_pr p
    WHERE
    s.first_arp_cd = p.dep_arp_cd  AND
    s.last_arp_cd = p.arv_arp_cd;
    
    
    In local testing we are seeing approx 25% degradation in 11.70,
    vs 11.50.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All IDS users prior to 11.70.xC8                             *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Update to IDS-11.70.xC8                                      *
    ****************************************************************
    

Problem conclusion

  • Problem Fixed In IDS-11.70.xC8
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC87251

  • Reported component name

    INFORMIX SERVER

  • Reported component ID

    5725A3900

  • Reported release

    B70

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-10-15

  • Closed date

    2014-02-26

  • Last modified date

    2014-02-26

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    INFORMIX SERVER

  • Fixed component ID

    5725A3900

Applicable component levels

  • RB70 PSN

       UP

  • RB70 PSY

       UP



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Document information


More support for:

Informix Servers

Software version:

B70

Reference #:

IC87251

Modified date:

2014-02-26

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