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Status Not under consideration
Workspace Db2 for z/OS
Created by Guest
Created on Oct 16, 2013

Row Change Timesatmp with Precision 12 and Timezone

Row change timestamp is sensitive to changing from daylight savings time to standard time since it doesn't support TIMESTAMP WITH TIMEZONE and other precisions than 6.
Applications have two requirements that could be combined and solved by the row change timestamp that was introduced in DB2 9 if it was supporting higher precision and storing the timezone.

First, applications need information on when a row was inserted to a table and when the same row was last updated. Having one column defined with TIMESTAMP (12) WITH TIMEZONE WITH DEFAULT will make DB2 insert the wanted information
about when the row was inserted. To make DB2 maintain the other column you can use TIMESTAMP (6) WITHOUT TIMEZONE GENERATED ALWAYS FOR EACH ROW ON UPDATE AS ROW CHANGE TIMESTAMP. Since there is no support for TIMESTAMP (12) WITH
TIMEZONE for a row change column, there will be a precision discrepancy as well as lack of timezone information in the latter column.
Second, applications want to use optimistic locking techniques. The current implementation of row change timestamp is based on storing the local time. This makes the optimistic locking implementation sensitive to the change from
daylight savings time to standard time since timestamps might reoccur during the first hour after the change.
  • Admin
    Janet Figone
    Aug 29, 2022

    Thank you for submitting this enhancement request. While we view all the enhancement requests we receive as valuable and we would like to implement all of them, in an effort to have maximum transparency we are not considering the ones that aren’t currently appearing on our 12 month product roadmap. This is not to say that these enhancements may not still be implemented at some point in the future as we do evaluate our requirements on the basis of customer demand and technical impact, to deliver maximum value to our customers.

    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,

    Db2 for z/OS Team