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IBM Data and AI Ideas Portal for Customers


This portal is to open public enhancement requests against products and services offered by the IBM Data & AI organization. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (https://ideas.ibm.com).


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Status Submitted
Workspace Db2
Created by Guest
Created on Sep 28, 2022

Add ALTER COLUMN options to modify numeric column length and allow rename column names for ((bi)temporal) column organized tables

Db2’s capabilities to perform schema changes on any form of ((bi)temporal) column organized tables lacks behind it’s row organized counterparts. This prevents effective database schema evolution and therefore limits the use of column organized tables in our database environment.

We need with priority the following ALTER COLUMN option:

  • Modification of numeric column type length

E.g. with growing amount of data we face the scenario that requires DBAs to increase DECIMAL type columns to allow for bigger numbers. Given current limitations with ALTER TABLE operations on column organized tables there is no way for us to apply common approaches that relational databases provide with row organized tables.

We are forced to consider approaches that involve unloading existing tables and re-load the data into new tables with the desired schema. This only works up to a certain amount of data given limited time during maintenance windows.

Adding functionality like temporal tables to this equation is limiting these kind of approaches even more as we need to ensure that data movement is not breaking the history nature of our data.

Adding these schema evolution options with ALTER COLUMN for any form of column organized tables will boost usability in real life database scenarios a lot.

Needed By Quarter
2 MERGED

Add ALTER COLUMN options to modify numeric column length and allow rename column names for ((bi)temporal) column organized tables.

Merged
Db2’s capabilities to perform schema changes on any form of ((bi)temporal) column organized tables lacks behind it’s row organized counterparts. This prevents effective database schema evolution and therefore limits the use of column organized tab...
2 months ago in Db2 / Statements (DDL and DML) 0 Submitted