How long ago can Oracle data be restored?
Oracle database allows users to restore data to a specific time through recovery point in time (RPO). This time point depends on the backup strategy, archive mode, corruption time and rollback segment. Available recovery points include point-in-time recovery (PITR), crash recovery, backup/recovery, and flashback queries. The specific RPO depends on the user's specific environment and needs.
Oracle data recovery time point
Oracle database allows users to restore Data recovery to a specific point in time. This point in time is called the recovery point in time (RPO).
Determine RPO
RPO depends on the following factors:
- Backup strategy of the database
- Archive mode of the database
- The time when the damage occurred
Rollback segment
Oracle uses rollback segments to save data modifications. When a transaction commits, its modifications are written to the rollback segment.
Flashback Query
Oracle 10g and later versions provide the flashback query function. This feature allows users to query data from a point in time in the past without having to perform recovery operations. Flashback queries use data from rollback segments.
RMAN Recovery
RMAN (Recovery Manager) is a tool that can be used to recover Oracle databases. RMAN can restore a database to any point in time recorded in a backup or archive log.
Specific Time Point
Your specific RPO depends on your specific environment and requirements. The following are examples of common points in time that can be used for recovery in Oracle:
- Point-in-time recovery (PITR): Recover the database to any point in time before the corruption occurred. Archive mode and flashback area need to be enabled.
- Crash recovery: Recover the database to the point of the most recent committed transaction.
- Backup/Restore: Restore the database to a specific backup time point.
- Flashback query: Query data at a certain point in time in the past without performing recovery operations.
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