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Status Not under consideration
Workspace IBM i
Categories Db2 for i
Created by Guest
Created on Nov 21, 2017

RELATED IDEAS

First-class support for modernizing a data model

Database modernization on the IBM i is more complex & expensive than it could be.

The Lab Services approach [1] of creating a logical file over redesigned tables, (to act as a surrogate for the old design) is a clever hack that reduces the cost somewhat.

But in order for database modernization to have first class support on the platform, we need the new instead-of-trigger functionality on logical files to allow the logical file to have a different record format then the physical.

Without this, database modernization is incompatible with instead of triggers. Being able to use instead of triggers would open up a world of design techniques that would reduce development times.

[1] Chapter 9 of the "Modernizing IBM i Applications" Redbook.


Use Case:

Create logical file matching existing table definition, and then add new columns like surrogate key, row change timestamp, etc with a new table name. Then try to define business rules at the data layer using instead-of-triggers.


Idea priority High
  • Guest
    Reply
    |     Nov 22, 2020

    IBM does not intend to provide a solution to this request at this time, so it is being closed.

    INSTEAD OF triggers are an SQL concept and cannot easily be extended to logical files as requested. The cost associated with implementing something like this would not be worth the benefit and would be unlikely to be widely adopted. It is recommended that logical files be modernized to use SQL objects (views and/or indexes).

  • Guest
    Reply
    |     Jan 16, 2018

    The CAAC has reviewed this requirement and recommends that IBM view this as a “nice to have” low priority feature. This sounds like a smart idea to do, but there are other ways to do this function.

    Background: The COMMON Americas Advisory Council (CAAC) members have a broad range of experience in working with small and medium-sized IBM i customers. CAAC has a key role in working with IBM i development to help assess the value and impact of individual RFEs on the broader IBM i community, and has therefore reviewed your RFE.

    For more information about CAAC, see www.common.org/caac

    For more details about CAAC's role with RFEs, see http://www.ibmsystemsmag.com/Blogs/i-Can/May-2017/COMMON-Americas-Advisory-Council-%28CAAC%29-and-RFEs/

    Dawn May - CAAC Program Manager

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