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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 / 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.
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