What are the methods of oracle database data backup?

Oracle database data backup can be achieved through the following methods: Physical backup: full cold, incremental cold, archive log Logical backup: export/import, RMAN backup/restore Block-based backup: backup set, block change tracking

Oracle database data backup method

In order to ensure the security of Oracle database data and avoid data loss, there are Regular backups are necessary. Oracle provides a variety of backup methods to meet various needs and environments.

Physical Backup

A physical backup creates an actual file copy of the database, including data files, redo log files, and control files.

• Full Cold Backup: Executed when the database is shut down, backing up all data files and redo log files.
• Incremental Cold Backup: Performed when the database is shut down, backing up changes since the last cold backup.
• Archive Log Backup: Back up online redo logs, which record all transactions since the last backup.

Logical Backup

Logical backup exports the logical structure and data of the database so that a copy of the database can be created from it.

• Export/Import(Export/Import): Export database objects (tables, views, stored procedures, etc.) to a file, and then import from the file to recreate the database .
• RMAN Backup/Restore: Use Oracle Recovery Manager (RMAN) to create a logical backup that can be restored to the same database or a new database.

Block-based backup

Block-based backup creates a copy of the database blocks, which is much faster than backing up the entire file.

• Backup Set: Group database blocks into backup sets to achieve incremental backup and fast recovery.
• Block Change Tracking: Tracks database blocks that have changed since the last backup and only backs up these changed blocks.

Choose the appropriate backup method

Choosing the best backup method depends on the size of the database, activity level, recovery time objective (RTO) and recovery points Objective(RPO). For large databases or databases that are updated frequently, block-based backups may be a good choice. For smaller databases or databases that are updated infrequently, a physical or logical backup may be sufficient.

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