Re: Restore problem from 8.4 backup to 9.0

Adam Wizon <adamwizon(at)mac(dot)com> writes:
> I installed v9.0 on my Mac Pro. Dumped the 8.4 database using 'pg_dump -Fc -d dbname --username=xyz > backup_file_name' using the pg_dump from the 8.4 installation. I restored the database using 'pg_restore -d dbname backup_file_name' using the 9.0 restore and after creating a new database under 9.0. Under version 9.0 the database looks ok, but I had a lot of the following errors (132) during the restore:
> pg_restore: [archiver (db)] could not execute query: ERROR: relation "xyz" already exists ...
> pg_restore: [archiver (db)] could not execute query: ERROR: multiple primary keys for ....
> pg_restore: [archiver (db)] COPY failed: ERROR: duplicate key value violates unique constraint ...

> I tried restoring the 8.4 restore file to a new 8.4 database and there
> were no errors. It almost looks like the schema already existed when I
> went to do the restore, but I was careful to create the new database in
> the admin tool under the correct server.

Restoring twice is almost certainly the explanation.

regards, tom lane