Answer / sampath

archivelog mode:
archivelog mode means that online redlogfile
copied to another location before overwritten.mainly it use
for recover purpose.

noarchivelog mode:
noarchive logmode means online redlogfile
not copied to another location each time overwritten by lgwr.

Answer / basobdutta

Archivelog mode - In archivelog mode cold and hot backups
are possible. We can recover our database upto the last
point of failure.

Noarchivelog mode- Here we can only go for cold
backup.Generally in this mode complete recovery is not
possible

Answer / neha

in nonarchivelog mode the online redo log file are
overwritten each time a log switch occurs.LGWR does not
overwrite an online redo file group until the checkpoint
for that group is completed.ex-operating system crash
causes an instance crash.

Answer / pv bhaskar

Archivelog mode : We can recover the database at any point
in time.


No Archivelog mode : There is no Recovery Process.

Because Online Redologs are overwritten. so there is no
Archives in this mode.

If there is Media Failure(loss of Disks or files) in this
mode we can restore from a backup but we will loss all
changes made to the database,After the backup was performed.

Answer / niraj chilka

In Archivelog mode we can perform both hot and cold
backup.In this mode we can restore+recover the data.There is
no need to worry about the losing the data.But all it comes
about the performance then we should place the redo log
files on faster disk to avoid performance loss.Try to put
archive on faster disk and also try to commit less.If you
write PL/SQL program that commits after every DML,then your
database will work slow.

In NON archivelog mode we cant recover the database when the
instance crash.Therefore upgrade database to 11g and there
are some has new feature called fast increment
backup.Because of this would loss some instance amount of
data.In non archivelog mode the performance of database is
high.

WHERE CAN WE SEE THE COMPLETE BACKBROUNG PROCESS IN RAC ENVIRONMENT THROUGH UNIX COMMAND.

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