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what is the difference between re-do and mirror log?
How it is related with database backup?
Please explain the database backup concept in detail.
Thanks in advance.:)
regards
preeti.
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Answer Posted / devd
In the Oracle RDBMS environment, redo logs comprise files in
a proprietary format which log a history of all changes made
to the database. Each redo log file consists of redo
records. A redo record, also called a redo entry, holds a
group of Change vectors, each of which describes or
represents a change made to a single block in the database.
For example, if a user UPDATEs a salary-value in a table
containing employee-related data, the DBMS generates a redo
record containing change-vectors that describe changes to
the data segment block for the table. And if the user then
COMMITs the update, Oracle generates another redo record and
assigns the change a "system change number" (SCN).
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