> Hmm, thanks for a tip. BTW, is output of
> select count(1), sum(relpages) from pg_class where relkind in
> ('r','i','t')

Well, if you do that for all databases in the cluster, it's the number you 
start with.  However, setting FSM_pages to that would be assuming that you 
excpected 100% of the rows to be replaced by UPDATES or DELETEs before you 
ran VACUUM.   I generally run VACUUM a little sooner than that.

See the end portion of:

Josh Berkus
Aglio Database Solutions
San Francisco

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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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