Re: Slow delete with with cascading foreign keys

Matthias Karlsson <matthias@yacc.se> writes:
> Tom Lane skrev:
>> If it's a reasonably modern PG version, EXPLAIN ANALYZE will break out
>> the time spent in each on-delete trigger, which should be enough to
>> answer the question.

> Thanks, that gave me something to work with. I targeted the triggers that had the most "uses", but it did not seem to

> help that much. I managed to reduce execution time with maybe 10-15%, but I'll try to apply indices more aggressively
to 
> see if it helps.

Hm, you still didn't mention which PG version you're using --- but if
it's pre-8.3, keep in mind that you need to start a fresh session to
get the plans for FK triggers to change.

            regards, tom lane