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Status Under review
Workspace Data Replication: Q-Replication & Availability
Components Replication for Availability (LUW, Db2 Warehouse)
Created by Guest
Created on Jun 27, 2025

RELATED IDEAS

Performance improvement for expression

Add one column with STATIC expression on target, but got long processing time (delay) on apply side. Would like to know the reason why.

New Expression:
Expression: ‘MES1’ -> site_cd

Existing expression looks like as:
CASE WHEN :SYS_CD is NULL then ' ' ELSE :SYS_CD END -> SYS_CD

The issue can be reproduced on testing environment.

The issue caused by select dual tables for mulltiple times...

Is it possible to change the behavior for the dual table selection? For example: for the "CONSTANT value" expression, just doing check ONCE is enough...

Needed By Quarter
  • Admin
    Girish Bhat
    Oct 15, 2025

    Hi Charlie,
    Thanks for the clarification.
    I spoke with Dev, they had follow-up query:
    Please help clarify the following:

    1. Environment Details:

      • Is this Q Replication from Db2 LUW to Db2 LUW?

      • What are the source and target table definitions?

    2. Subscription Configuration:

      • Please provide a sample subscription showing how the expressions are defined.

      • Are there other expressions or transformations involved?

    3. Performance Observation:

      • What exactly does “select dual tables for multiple times” refer to?

      • Which tables are being queried repeatedly?

      • Is there any trace or log that shows the repeated access pattern?

    Also, the source table contains a column named SYS_CD, replicated to another table where 'SYS_CD' mapped to some other column using a column expression in the subscription. Is there an example that can be provided (You could also just create an example that exactly illustrates the problem)


    Reply
  • Guest
    Oct 15, 2025

    Hi Girish,

        Any other information needed?

    Thanks

    Charlie

    Reply
  • Admin
    Girish Bhat
    Aug 18, 2025

    Hi Charlie,

    Have you tried opening a support ticket on this?

    I look forward to your response

    Regards

    Girish

    1 reply

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