ALTER DATABASE target_database OWNER TO new_onwer;
ALTER DATABASE name OWNER TO new_owner;
ALTER TABLE <tablename> OWNER TO <username>
#TABLES
for tbl in `psql -qAt -c "select tablename from pg_tables where schemaname = 'public';" YOUR_DB` ; do psql -c "alter table "$tbl" owner to NEW_OWNER" YOUR_DB ; done
#SEQUENCES
for tbl in `psql -qAt -c "select sequence_name from information_schema.sequences where sequence_schema = 'public';" YOUR_DB` ; do psql -c "alter sequence "$tbl" owner to NEW_OWNER" YOUR_DB ; done
#VIEWS
for tbl in `psql -qAt -c "select table_name from information_schema.views where table_schema = 'public';" YOUR_DB` ; do psql -c "alter view "$tbl" owner to NEW_OWNER" YOUR_DB ; done
ALTER TABLE "schemaname"."tablename" OWNER TO role_name;
pg_dump -Fp -f dbbackup.dmp <dbname>
vi dbbackup.dmp
:%s/oldowner/newowner/g
save and exit