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Status Not under consideration
Workspace Db2
Components Statements (DDL and DML)
Created by Guest
Created on Nov 16, 2016

RELATED IDEAS

Improve access plan resolution for SELECT MAX() (or MIN()) statements on range-partitioned tables with local (partitioned)

Context: range partitioned table with partitioned indexes
A SELECT MAX() statement is issued on a field that is not the part of the partitioned key. The query is resolved by performing a full index scan on a partitioned index on that field.
That is, DB2 performs a complete index scan over all partitions and a sort to find the MAX().
We expect that DB2 would do the MAX() on each partitioned index object, and then pickup the MAX of all of them. This way a full scan is not needed and the IO/CPU cost and execution time would be greatly
  • Guest
    Reply
    |     Apr 30, 2024

    .... would be very important improvement for us!

  • Guest
    Reply
    |     Nov 4, 2022

    For us it would be also very important to speed up the max()-function

  • Guest
    Reply
    |     Jun 24, 2021

    this approach should also be evaluated not just for MIN() or MAX() function, but also, if user wants to get the first N set of rows, by using FETCH FIRST n rows clause..
    like
    select colum1 from tab1 order by 1 fetch first 50 rows.
    and similar limited range set of rows are involved,, should also be considered.


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