Oracle Error RMAN-06138: control file not mounted – must specify AT clause with REPORT command

Oracle Error Message

RMAN-06138: control file not mounted – must specify AT clause with REPORT command

Reason for the Error

A ‘REPORT SCHEMA’ with no at_clause was issued, and there is no recovery catalog, and there is also no control file mounted at the target database, so there is no place to get the information about the current list of files comprising the database.

Solution

Use a recovery catalog or mount a control file at the target database.