Before you create the Replication Agent transaction log, you can specify the object name prefix string that will be used to name all the transaction log tables.
The pdb_xlog_prefix configuration parameter stores the prefix string. Use the ra_config command to change the value of the pdb_xlog_prefix parameter.
When the pdb_xlog_prefix parameter is set to use the prefix string you want for the Replication Agent transaction log tables, you can use the pdb_xlog command to create the transaction log base objects in the primary database.
Replication Agent uses the value of pdb_xlog_prefix to
find its transaction log tables in the primary database. If you
change the value of pdb_xlog_prefix after
you create the transaction log, the Replication Agent instance will not
be able to find the transaction log tables that use the old prefix.