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Primary Keys should allow NOT TRUSTED

Currently you can create NOT ENFORCED primary keys but the optimizer will then always treat these as trusted. This causes problems when the constraint is violated but a filter includes all PK columns since the engine will return only one row even though multiple rows may exist.

  • Avatar32.5fb70cce7410889e661286fd7f1897de Guest
  • Oct 8 2019
  • Future consideration
Who would benefit from this IDEA? Customers migrating from Netezza, customers whose data modelers want to have the constraints defined for all business objects, customers who have reporting tools.
How should it work?

The change would be to allow the "NOT TRUSTED" clause to be specified for primary key constraints. This would work like other similar informational constraints - they are there for data modeling tools and not as much for the optimizer.

Idea Priority High
Priority Justification Many customers are currently migrating from Netezza which already has this functionality
Client Name Anthem
  • Attach files
  • Avatar40.8f183f721a2c86cd98fddbbe6dc46ec9
    Guest commented
    4 Feb 03:05pm

    We are migrating from Netezza to IIAS. We were glad to see that on DB2 we could use ENFORCED primary/unique keys to avoid duplicates. Unfortunately we've hit performance issues with our ETL workflows and we were advised to drop the enforced constraints.
    So we've started using UNFORCED primary/unique keys and we run a script to check these constraints ourselves after the ETL workflows. Our reporting tools also use this keys to link tables.
    Now our script notifies us that we have duplicates in some tables. But when we want to consult these lines in our query tool, we don't get to see these duplicates...
    Very annoying and inconvenient!

  • Avatar40.8f183f721a2c86cd98fddbbe6dc46ec9
    Guest commented
    31 Jan 01:46pm

    Hungarian customers (3 of them) are asking the same

  • Avatar40.8f183f721a2c86cd98fddbbe6dc46ec9
    Guest commented
    31 Jan 01:04am

    Japanese Netezza customers hit this issue, and are in critical situation... Some of them use PK with duplicated value for information column.  At least four customers suffer from this incompatibility.  Please let primary keys allow "NOT TRUSTED" to avoid returning incorrect results.

  • Avatar40.8f183f721a2c86cd98fddbbe6dc46ec9
    Guest commented
    9 Dec, 2019 03:52pm

    The customer BNP Paribas / Cardif is asking the same

  • Avatar40.8f183f721a2c86cd98fddbbe6dc46ec9
    Guest commented
    8 Oct, 2019 07:35pm

    There is some discussion on Slack on this.  E.g. https://ibm-analytics.slack.com/archives/C90RRNVKQ/p1570563079464100?thread_ts=1570537379.446900&cid=C90RRNVKQ

    https://ibm-analytics.slack.com/archives/C09LPM1DX/p1570235281128800?thread_ts=1570213739.127700&cid=C09LPM1DX


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