INTERVIEW QUESTIONS ORACLE CONCEPTS AND ARCHITECTURE DETAILS

Question: What is a Redo Log ?

Answer: The set of Redo Log files for a database is collectively known as the database's redo log.

The set of Redo Log files for a database is collectively known as the database's redo log. Source: CoolInterview.com

REDO is the record of changes made to the database. It is used to reapply changes that may have been lost by not being written to disk before shutdown. When a DML statement runs, the changes are recorded in the redo log buffer. LGWR frequently writes these change vectors to the online REDO log files. Source: CoolInterview.com

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