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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!
Hungarian customers (3 of them) are asking the same
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.
The customer BNP Paribas / Cardif is asking the same
There is some discussion on Slack on this. E.g. https://ibm-analytics.slack.com/archives/C90RRNVKQ/p1570563079464100?thread_ts=1570537379.446900&cid=C90RRNVKQ