"Mark Dexter" <[EMAIL PROTECTED]> writes:
> Several recent postings appear to confirm that there is an issue with
> the use of VACUUM or ANALYZE on empty tables.  Specifically, if you
> VACUUM or ANALYZE a table that is empty and then insert a large number
> of rows into this table, you will experience very poor performance.

Well-known issue.  See this thread for the latest discussion:
http://archives.postgresql.org/pgsql-hackers/2004-11/msg00985.php

                        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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