While registering the database in the catalog if you are facing RMAN-06428: recovery catalog is not installed, then it shows catalog database is not created yet.

Problem:

RMAN> connect catalog rman_test/rman@oracat

connected to recovery catalog database

RMAN> register database;

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of register command at 04/04/2016 11:13:49
RMAN-06428: recovery catalog is not installed

Solution:

Create the catalog using below command.

RMAN> create catalog;

recovery catalog created

Now register the database.

RMAN> register database;

database registered in recovery catalog
starting full resync of recovery catalog

full resync complete