O/S authentication
If you want to connect to a target database using O/S authentication, use the following command:
$ rman target / nocatalog
Recovery Manager: Release 9.0.1.0.0 - Production
connected to target database: BRDSTN (DBID=664610428)
using target database controlfile instead of recovery catalog
You can use O/S authentication only from an O/S account on the database server.
Note
With Oracle 8.0.x and Oracle8i, you must specify nocatalog on the command line to connect without using a catalog. With Oracle9i, nocatalog is the default connection mode.
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