I am upgrading PostgreSQL from version 9.3.5 to 9.6.12. The 9.6.12 is on a new server. I am going to use pg_dump to make a backup of the DB on 9.3 and pg_restore on the new 9.6 server.
Should I already have the onwers of the different DBs created as well as empty databases on the new server when I do the restore?
Any other advice would be appreciated.
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Roles are global and their creation is not part of a single database's pg_dump, so they have to be created before restoring a pg_dump file. Otherwise the grants that are applied during the restore will fail. You can get the role (and all global information) using pg_dumpall first
pg_dumpall -U postgres -g -f globals.sql
Then just feed that file into the new system with psql
psql -U postgres -f globals.sql
You can use the -C option to pg_restore to have it automatically create the originally named database for you as part of the restore. Otherwise you will have to create it first.
Also, it is highly recommended that you use the pg_dump binary from the version you're upgrading to to perform the dump, not the original version's pg_dump. This better ensures any fixes to catalogs and other items are applied to the dump file that is created. If you don't want to perform the dump across the network, you can copy the pg_dump binary from the new system to the old one as long as they're the same architecture.
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