Sometimes, it's useful to get a dump of the object definitions that make up a database. This is useful for comparing what's in the database against the definitions in a data- or object-modeling tool. It's also useful to make sure you can recreate objects in the correct schema, tablespace, and database with the correct ownership and permissions.
The basic command to dump the definitions only is the following:
pg_dumpall ––schema-only > myscriptdump.sql
This includes all objects, including roles, tablespaces, databases, schemas, tables, indexes, triggers, constraints, views, functions, ownerships, and privileges.
If you want to dump PostgreSQL role definitions, you can use this command:
pg_dumpall -–roles-only > myroles.sql
If you want to dump PostgreSQL tablespace definitions, you can use the following:
pg_dumpall -–tablespaces-only > mytablespaces.sql
If you want to dump both roles and tablespaces, then you can use this:
pg_dumpall...