Thursday 22 May 2014

Differences between COLD and HOT backups



What are the differences between COLD and HOT backup? And the benefits associated with each?



S.NO
HOT backup
COLD backup
1
HOT backup is taken while database is in up and running state
COLD backup is taken while the database is in graceful  shut down state
2
For HOT backup database must be in archive log mode
For COLD backup database need not be in archive log mode
3
Using HOT backup we can recover the database till any point in case of disasters
Using COLD backup we can recover the database till the point where we took backup only. Later changes will be unavailable
4
Excessive redo is generated during HOT backup
Since the database need not be in archive log mode we can gain slight  performance
5
It is online backup
It is offline backup
6
HOT backup is inconsistent backup
It is Consistent backup
7
Since HOT backup don’t need downtime we can use this for a database that performs 24*7 operations
Since COLD backup needs downtime we can’t afford to use it for a database that performs 24*7 operations
8
Using HOT backup we will take Control, Redo (optional), Data files for backup.
During COLD backup we will take Control, Redo (optional), Data files for backup same as hot backup.


Related links:
     



No comments:

ORA-600 [kwqitnmphe:ltbagi], [1], [0] reported in the alert log file.

ORA-00600 [kwqitnmphe:ltbagi] Cause: This issue arises in 12.1.0.2. The error occurs because there are still Historical Messages without...