"Bartek GRUbY" <[EMAIL PROTECTED]> writes:
> i have similar problem - can't make dumps of any db with the same error 
> message (and all applications using this pg server works fine) . But in my 
> case, i think, only user 'postgres' is duplicated:

> template1=> select * from pg_catalog.pg_shadow where usename = 'postgres';
>  usename  | usesysid | usecreatedb | usesuper | usecatupd |               
> passwd                | valuntil | useconfig
> ----------+----------+-------------+----------+-----------+-------------------------------------+----------+-----------
>  postgres |        1 | t           | t        | t         |                   
>                   |          |
>  postgres |        1 | t           | t        | t         | 
> md5c084502ed11efa9d3d96d29717a5e555 |          |
> (2 rows)

What PG version are you using exactly?  Could we see the system columns
for those rows, ie,

        select ctid,xmin,xmax,cmin,xmax,* from pg_shadow where usename = 
'postgres';

                        regards, tom lane

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