"Carlos H. Reimer" <[EMAIL PROTECTED]> writes:
> When one of the biggest tables has all lines updated for example, it takes
> at about 30 minutes for processing. If we drop all indexes (21) and let only
> the primary index the same update takes 2 minutes.

21 indexes??

If update performance is important then you should try to economize on
indexes.  Do you have evidence that each of those indexes is worth its
update costs?

                        regards, tom lane

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not
       match

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