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PM88224: enabling DCNs has a large impact on performance when saving large changes

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APAR status

  • Closed as program error.

Error description

  • If DCNs are enabled on a DB, the saving performance when saving
    a module containing lots of changes, will be seriously affected.
    
    Saving without DCNs enabled is almost instant on a test setup,
    regardless of the size of the edit.
    
    The figures below are the save time having edited a single
    attribute in the given number of objects.
    
    10,000 edits - 203s
    5,000 edits - 74s
    1,000 edits - 12s
    
    This was introduced in v9.4.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    If DCNs are enabled on a DB, the saving performance when
    saving a module containing lots of changes, will be
    seriously affected.
    
    Saving without DCNs enabled is almost instant on a test
    setup, regardless of the size of the edit.
    
    The figures below are the save time having edited a single
    attribute in the given number of objects.
    
    10,000 edits - 203s
    5,000 edits - 74s
    1,000 edits - 12s
    
    This was introduced in v9.4.
    

Problem conclusion

  • The code has been changed so that the performance is now improve
    d in this scenario.
    
    So. in order to avoid the performance impact of enabling the DCN
     service, upgrade the Rational DOORS client and database server
    to version 9.5.2 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM88224

  • Reported component name

    TLOGIC DOORS

  • Reported component ID

    5724V61DR

  • Reported release

    930

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-05-01

  • Closed date

    2013-12-13

  • Last modified date

    2014-02-06

  • 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

    TLOGIC DOORS

  • Fixed component ID

    5724V61DR

Applicable component levels

  • R930 PSN

       UP



Document information

More support for: Rational DOORS

Software version: 9.3

Reference #: PM88224

Modified date: 06 February 2014