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Status Not under consideration
Workspace Db2
Components Tables/Index (Range, MQT, MDC, etc.)
Created by Guest
Created on Oct 8, 2019

RELATED IDEAS

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.

Needed by Date Oct 8, 2019
  • Guest
    Feb 4, 2020

    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!

  • Guest
    Jan 31, 2020

    Hungarian customers (3 of them) are asking the same

  • Guest
    Jan 31, 2020

    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.

  • Guest
    Dec 9, 2019

    The customer BNP Paribas / Cardif is asking the same

  • Guest
    Oct 8, 2019

    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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