[PERFORM] performance of foreign key constraints

[teknokrat]

I have a table that has about 20 foreign key constraints on it. I think 
this is a bit excessive and am considering removing them ( they are all 
related to the same table and I don't think there is much chance of any 
integrity violations ). Would this improve performance or not?

thanks

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TIP 9: the planner will ignore your desire to choose an index scan if your
     joining column's datatypes do not match