Ignoring the fact that PG 12 is nine months EOL, 12.3 is missing a _lot_ of bug fixes. You should be on 12.22.
cfg master-slave with streaming replication and I am facing a issue in the present active Pg db.
The database size reported from the following : pg_size_pretty() or pg_database_size() or sum all of db objects is grater than the sum size of all directories/files reported under /var/lib/pgsql/data1/tbl_space_name/PG_12,,,xxx/ . ( db data tablespace)
[ Mention in standby PG db the size matches the /data sum file size and also matches with the size reported in Pg active for pg_size_pretty() or pg_database_size ]
