On Mon, 11 Oct 2004, John Meinel wrote:

Postgres believes that it will cost 382 to do a sequential scan, versus 490 for an indexed scan. Hence why it prefers to do the sequential scan. Try running explain analyze to see if how accurate it is.

With explain analyze I have with sequential scan on Sort (cost=382.01..382.15 rows=56 width=196) (actual time=64.346..64.469 rows=24 loops=1)

And with seqscan off Sort (cost=490.82..490.96 rows=56 width=196) (actual time=56.668..56.789 rows=24 loops=1)

So I guess that for this particular query I am better off setting the seqscan off.

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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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