ERROR: simple_heap_delete: tuple already updated by self

Dear All ,

I am using postgres 7.3. on RHEL 4.0

I have table on which there are duplicate rows even though there is a primary key constraint.I dont know how the rows got duplicate , because in my s/w there is no such possibility.

Wel till now i used to delete the row duplicate row with the help of OIDS. But on a prticular server while deleting the duplicate row i got error "ERROR: simple_heap_delete: tuple already updated by self "

If I dump the table using pg_dump and restore it in a temorary table without primary key constarint, then i am able to delete the duplicate row.

Kindly help in identifying and solving this problem , and why the rows are getting duplicate automatically

Regards,
Utsav
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