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Status Not under consideration
Workspace Db2 for z/OS
Created by Guest
Created on Dec 15, 2018

RELATED IDEAS

Avoid writing to intermed...

Avoid writing to intermediate workfile for inner table expressions with ROWNUMBER()
In SAP lifecycle management tasks, standard SAP tables need to be split in buckets of about the same size via primary key. The idea is then to process these buckets in parallel, e.g. to unload data. To accomplish the splitting, the SAP tools issue queries of the following pattern with ROWNUMBER() in a table expression.
select sprsl, arbgb, msgnr
from (select sprsl, arbgb, msgnr,
rownumber() over (order by sprsl, arbgb, msgnr) as rown
from t100) as q
where mod(rown, 100000) = 0

To process such a query, DB2 materializes the inner table expression after evaluating the ROWNUMBER. This materialization is written to an intermediate workfile. For large tables, this results in using excessive workfile space, which customers would like to avoid.
The request is to avoid writing to an intermediate workfile.
  • Guest
    Feb 21, 2023

    Dear Peter, Thank you for submitting this enhancement request. The Db2 for z/OS team re-reviewed it and provided the following feedback:

    Although Db2 continues to reduce the need for intermediate workfiles in some cases, in this particular scenario the predicate has to be evaluated on a table or workfile. For correct output it cannot be pushed down to an inner select.

    Some alternative approaches are

    1. Use range partitioning.

    2. Use FETCH FIRST n ROWS

    3. Add a sequence number as a new column.

    Since there are no plans to implement the solution requested, this idea is being marked as not under consideration.

    We appreciate your input to the Db2 for z/OS development team. And we hope that you will continue to submit enhancement suggestions for improvements as customer feedback is a key component to shaping the future direction of Db2 for z/OS.

    Sincerely,

    The Db2 for z/OS Team


    Reply

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