The instance of the duplicate database is called the auxiliary instance. RMAN must be connected as AUXILIARY to the instance of the duplicate database. Prerequisites Common to All Forms of Duplication The prerequisites vary depending on the type of duplication. RMAN creates duplicate files from RMAN backups and copies that were placed in a designated BACKUP LOCATION. RMAN creates duplicate files from pre-existing RMAN backups and copies.īackup-based duplication without a connection to target or a recovery catalog This mode is useful when the target database is not available or a connection to it is not desirable (as mandated by security policy restrictions or a firewall).īackup-based duplication with a target connection This form requires a connection to an auxiliary instance and a recovery catalog. The DUPLICATE command must have been issued with the DATABASE clause. RMAN creates duplicate files from pre-existing RMAN backups and copies. Backup sets offer several advantages, including unused block compression and encryption.īackup-based duplication without a target connection RMAN duplicates the files directly from either an open or mounted database.Īctive duplication can use image copies or backup sets. RMAN can perform the duplication in any of the following supported modes: A standby database is not assigned a new DBID. Typically, duplicate databases are used for testing.Ī standby database, which is a special copy of the source database (called a primary database in a Data Guard environment) that is updated by applying redo data from the primary database. Because a duplicate database has a unique DBID, it is independent of the source database and can be registered in the same recovery catalog. RMAN can create either of the following types of databases:Ī duplicate database, which is a copy of the source database (or a subset of the source database) with a unique DBID. Use the DUPLICATE command to create a copy of a source database.
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