Answer / annabathula

Redo Log:-

Redo log management plays a part in the following actions

During execution of a modifying transaction, the redo log entries are included in the log queue. The log writer writes the

log pages from the log queue to the log area.

During a Structure linklog backup, information is obtained on whether entries from the log area are to be backed up, and if

so, how many.
In the case of a restart or recovery, the required redo log entries are read from the log area.
The database parameters and other internal information that controls logging are stored in the log area and updated at

regular intervals.


Mirroring:-

It is essential to mirror the online redo log files in database. This procedure describes how you can check the mirroring

with BRSPACE. Also, the system check in BRCONNECT checks mirroring.
If you lose one or more online redo log files, you can no longer recover the database changes recorded in them. This means

that you can only recover the database up to the first gap in the online redo log records. For this reason, we strongly

recommend that you mirror the online redo log files. We recommend that you make at least one copy.
If an online redo log file of a group is lost, the database remains in operation. Oracle then uses the remaining member (or

members) of this group to log the database changes. In such a case, you must recover the original mirroring of the online

redo log files as quickly as possible.

Answer / 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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