Re run a failed map from the point of failure.

Question

Can anyone please let me know if you can re-run a map from the point of failure.
Rdgs,
Dominic

Answer 1

Hi Dominic,
Interesting question, I've never run into a requirement for that, even though it seems pretty standard.
Just philosophising about this, you can build a mapping with a relatively low commit frequency value (say 1% of total rows = 20000), and a check mechanism on the PK value that checks your target whether the PK already exists; if so you don't insert it, if nog you do insert it.
Check mechanism possible by building view on source with NOT EXISTS clause looking up target, or by using the target as a source in the mapping to compare against the source outer joining it and then only picking up the ones for which there is no match. Pick the one with the best performance.
Of course this only works if the source in your mapping is a table that contains all data necessary to do this check (i.e. if the 'end' source for your target table is the result of lots of the work of lots of mapping operators, it might prove to be harder).
Then when you have built this mapping, you can simply re-run it without worrying about introducing duplicates etc.
Hope this helps.
Good luck, Patrick