To find RMAN catalog version log-in to the catalog through SQL*Plus and query the table rcver will print version.

SQL> select * from rcver;

VERSION
————
10.02.00.00

SQL> select object_type from user_objects where object_name = ‘RCVER’;

OBJECT_TYPE
——————-
TABLE

SQL> desc rcver;
Name Null? Type
—————————————– ——– —————————-
VERSION NOT NULL VARCHAR2(12)