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Status Not under consideration
Workspace Db2 for z/OS
Created by Guest
Created on Feb 9, 2017

RELATED IDEAS

V12-CERT-2017 - Stop predicates in Range-list index scan (Accesstype NR).

Range-list index scan is a very efficient access for SQL Pagination.

Whatever we use DB2 11 Syntax:

Where ((Col1 = ?
AND Col2 >?)
OR Col1 > ?
ORDER BY Col1, Col2

Or DB2 12 Syntax:

Where (Col1, Col2) > ( ?, ?)
ORDER BY Col1, Col2

In both cases DB2 are able to use ACCESSTYPE NR. This is very efficient if Col1 has a low cardinality.

If the result set must be limited to a specific end position, an end-predicate must be added:

AND Col1 < ?.

DB2 will not use Range-list access with a matching end-predicate. As a result DB2 will probably use regular matching index scan (ACCESSTYPE I).

To solve this access efficient, support for matching end-predicate is required in range-list access.
  • Admin
    Janet Figone
    Reply
    |     Aug 30, 2022

    Thank you for submitting this Db2 for z/OS enhancement request. We have reviewed this request and believe it is a good candidate

    for the Db2 for z/OS product. However, it does not align within functionality prioritized for delivery within the next 12 months. Therefore, unfortunately, we will not be considering this idea at this time.

    This idea will remain in our product backlog and may be revisited as we continue to plan for later features and functions.

    We appreciate your input to the Db2 for z/OS development team. 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

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