thanks for responding. Meanwhile I found out that ist was my own fault. A newly installed insert trigger fired unexpectedly and caused the error. Now I'm redesigning my functions to make them smaller so that errors can be found easier. Sometimes I wish there was something like a debugger for PL/PGSQL with breakpoints, single step, variable watching...
Anyway, PostgreSQL is the best backend I ever have worked with.

Regards
--Marcel
>>> Tom Lane <tgl@sss.pgh.pa.us> 13.01.2007 >>>
"Marcel Gsteiger" <Marcel.Gsteiger@milprog.ch> writes:
> Now since I upgraded to 8.2 I have problems inserting data into tables that have unique indexes. Ugly enough, I get the message 'duplicate key violates unique constraint' when inserting the very first record into a table. This happens everytime when the new tuple references another tuple that has been inserted just before this one in the same transaction.

> Putting a "SET CONSTRAINTS ALL DEFERRED" in my procedure does not help.

> To me it looks that something with referential integrity checking goes wrong, but in this case the error message would be misleading.

RI would not have anything to do with a duplicate-key error.

Do you have any SERIAL-type columns in these tables? My first thought
is of a sequence that hasn't been updated to be above the existing ID
values. It's fairly easy to get into such a state if you do anything
but a plain vanilla dump-all-and-reload-all update process ...

regards, tom lane


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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match