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Status Future consideration
Created by Guest
Created on Feb 25, 2022

CDC for DB2 LUW - Refresh "RS" record is out of order - add DB2 Parameter CPU_PARALLELISM in CDC

When performing a Refresh to a DB2 LUW Target, then there is a record with Entry Type "RS" written to the target table, before the data records follow up with Entry Types "RR" only. The background of the first artificial "RS record" is to be able to distinguish between different Refreshes. Imagine you perform two refreshes directly after each other, there would be no criteria (in IBM CDC) to distinguish between them. IBM tried to solve that circumstance with the "RS record", however this record relies totally on the correct order to be written to the target, i.e. first RS record, then all RR records. Per default IBM uses export files and the DB2 Load Utility for the target refresh, but then the target database coordinates the load and can execute the load in parallel. In that case the RS record is somewhere in between the RR records and thereby out of order. The idea/solution: The Load Utility has a parameter CPU_PARALLELISM, which has to be set to 1 (no parallelism). Then the RS and RR records would be in the right order (we have tested it). So there should be added a new data store system parameter to configure that in the Management Console. Currently we use jdbc for refresh as workaround, which gives us the correct order, but which is much slower.
Needed By Month
  • Admin
    MARY O'SHEA
    Apr 5, 2022

    Thank you for your help & support in raising this IDEA. We have reiewed this and agree this is a valid requirement. We will include it for consideration when we are developing the next iteration of our roadmap . At this point we do not have a commmitted date but will continue to monitor for additional customer demand.,