"Mindaugas Riauba" <[EMAIL PROTECTED]> writes:
> ... So contents of database changes very fast. Problem is that when
> pg_autovacuum does vacuum those changes slows down too much.

The "vacuum cost" parameters can be adjusted to make vacuums fired
by pg_autovacuum less of a burden.  I haven't got any specific numbers
to suggest, but perhaps someone else does.

                        regards, tom lane

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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

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