Thread: Copy error?

Hi all,

         Database: 7.1.3 (RPM)

     OS: Redhat 7.1

         Table: Create table jquserdata (

                                     Username varchar(20) not null, primary key,

                                     …)

Copy some corrupted data from a 7.1.3 (Encoding ASCII) with pg_dump, then copy them (psql –e gamedb <data) to a new database(Encoding EUC_CN), some error reported (duplicate primary key), I erased these rows and re-execute, finally all data copied, next ,vaccum –z gamedb, this error still reported:

Cannot insert a duplicate key into unique index jquserdata_pkey !

Why? Everything is Ok when I use 7.0.2, but after I upgraded my database to 7.1.2 (next 7.1.3), things goes wrong. If no one can answer this question, the only thing I can do is go back to 7.0.2. But how to downgrade a database?