--- Tom Lane <tgl@sss.pgh.pa.us> wrote:
> It looks to me like the 7.3 planner will not choose indexscans for the FK
> check queries in this example, because the comparison operators are
> misconstrued as shown in this thread:
> http://archives.postgresql.org/pgsql-hackers/2003-03/msg00997.php
> The equality operator on your domain is taken to be "oideq" which won't
> be the same operator associated with the index on the column.
>
> This seems to be fixed in 7.4. In 7.3 I'd counsel not introducing
> domains unnecessarily.
>
> regards, tom lane
It looks like it worked. I moved to 7.4.b4 and, in my case, performance
improvement on insert is drastic (about 30x). Thanks
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