Connecting to Both a Target and a Catalog
If you’re using a catalog, you will typically connect to the target and the catalog at the same time. This is because when you’re performing backup and recovery operations both the target and the catalog need to be aware of your activities.
If you’re logged on to the target database host, your connection to the catalog usually will be through a network connection. This is because in a production environment your catalog database should never reside on the same host as your target database. If your target and catalog are on the same host, you have a single point of failure, and you may not be able to recover your target database.
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