What are consistent and inconsistent backups?
By submitting your personal information, you agree that TechTarget and its partners may contact you regarding relevant content, products and special offers.
A consistent backup is one where the database has been shut down. This is also called a cold backup. The database is guaranteed to be in a consistent state because no one can possibly be using the database; it is down. An inconsistent backup is taken when the database is up and running. This is also called a hot backup. While the backup is being performed, the database can still undergo change. A datafile in your backup can have old transactions and new transactions. This means the datafile is not consistent with a single point in time. Oracle needs to use special mechanisms to handle this inconsistency. One mechanism Oracle uses is the archived redo logs so that transactions can be replayed during recovery.
Dig Deeper on Oracle database backup and recovery
Related Q&A from Brian Peasland
Oracle expert Brian Peasland answers one reader's question about common pitfalls when connecting Oracle to outside programs.continue reading
One reader asks expert Brian Peasland a question about datafile sizes with the Oracle RMAN duplicate 10g command.continue reading
Managing parent table-child table relations in Oracle SQL environments is key to efficient programming.continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.