Individual tables to be replicated must be marked. You can mark tables explicitly using the pdb_setreptable command or automatically during ra_admin init processing when the pdb_automark_tables configuration parameter is set to true.
To replicate transactions that affect the data in a table in the primary database, that table must be marked for replication, and replication must be enabled for the marked table.
Marking a table can be separate from enabling replication for that table. If the value of the pdb_dflt_object_repl parameter is true, replication is enabled automatically at the time a table is marked.