RMAN

RMAN (Recovery Manager) is Oracle’s native tool for database backup, restore and recovery. It is a command-line utility that manages all data protection operations in an integrated way with the database.

What it does #

• Backup: full, incremental, archived log only
• Restore: recovery of datafiles, tablespaces or the entire database
• Recovery: applying redo logs to bring the database to a specific point in time
• Duplicate: creating database copies, including standby databases for Data Guard

RMAN and Data Guard #

For standby database creation, RMAN allows DUPLICATE ... FOR STANDBY FROM ACTIVE DATABASE — a direct network copy from primary to standby, with no need for intermediate tape or disk backups. The command transfers all datafiles and controlfiles and configures them automatically for replication.

Why RMAN over manual copies #

RMAN understands the internal structure of the Oracle database: it knows which blocks have changed (for incrementals), which files are needed, how to apply redo. A manual file copy (with cp or rsync) does not guarantee consistency and requires the database to be shut down. RMAN can work with the database open, with minimal performance impact.