I have a table A with an int column ID that references table B column ID. Table B has about 150k rows, and has an index on B.ID. When trying to copy 1 million rows into A, I get the following \timings:
1) drop FK, copy (200s), add FK (5s)
2) add FK defferable initially deffered, copy (I aborted after 30min)
3) add FK defferable initially deffered, begin, copy (200s), commit (I aborted after 30min)
How do I explain why test cases 2 and 3 do not come close to case 1? Am I missing something obvious?
Since the database I am working on has many FKs, I would rather not have to drop/add them when I am loading large data sets.
If it would help I can write this out in a reproducable scenario. I am using postgresql 7.4.5 at the moment.
Sincerely,
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