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Status Future consideration
Workspace Optim
Created by Guest
Created on Oct 22, 2021

Same level of performance in extract processes in DB2 and IMS when qualifing the column of the cluster index

Since OPTIM V11.7, we experienced dramatic performance regressions with the component "Extract on an IMS Database".

The extract criterion is almost all the fields of the primary/cluster key.

The database contains 15.6 millions records - 1 hit is expected

With V11.3, the research consume 0.1s CPU records and read few records

With V11.7, the research consume 60s CPU, 15 mn elapse an read all the database

The pseudo SQL is :

SQL //CODFAM = 'A' AND ETAB = '000' AND CODDEV = ' ' //

// AND NCPTP > '00021107107' //

The support aknowleged the facts but answered that the solution required too huge work to optimize the SSA'qualification SSA and the Selection/SQL criteria

We will be very pleased if you accepted to review the 11.7 code so that we will have equivalent performances in IMS and in DB2 when using cluster index

Needed By Month
  • Admin
    Peter Costigan
    Apr 5, 2022

    This requirement makes a reasonable request that we review the Optim native z/OS code because the performance has regressed between Optim native z/OS 11.3 and 11.7. I will mention that the main difference between Optim native z/OS 11.3 and 11.7 is in regard to processing data in Unicode and other character sets, and the data being searched in IMS is character data, so it is possible that major enhancement may be affecting the behavior of Optim in this case.

    I will ask that Optim native z/OS Support and Development review this code. I happen to know they are busy with some other items, so this may take more than a few days.