I've been reading about backup and recovery, but there are 2 questions that
I haven't seen covered, but I'd like to know the answer to. If anyone would
point me in the right direction on these, I'd appreciate it.
- In Oracle 8i, do you really need periodic cold backups if you're running
in archivelog mode or can you just use the hot backups of the data files,
plus the archive logs from the time of the backup forward and the current
control file and online redo logs to perform a recovery?
- From what I understand, if any copy of the control file is not available,
the database will crash and you have to shutdown, replace the file with a
good copy or remove reference to it from the init.ora and restart. Assuming
this is true, I decide to only multiplex the online redo logs and archive
redo logs on a remote server (because they can withstand a failure as long
as one copy is available) and just multiplex the control file on multiple
disks on the main server. I'm doing hot backups every night at 9PM, they
finish at 11PM. The main server has a complete failure at 10AM the following
morning. I restore the data files, control file, pre 9PM archive logs and
init.ora from last night's tapes. I move the post 9PM archive logs and the
online redo logs back from the remote server. The timestamps on the data
files and control file are no later than11PM yesterday. Can I roll forward
to point of failure (10AM the following day) with the post 9PM archive logs
and use the undamaged version of the online redo logs copied from the remote
server even though my control file's last timestamp was 11 PM?
Thanks for clearing this up for me and anyone else who didn't know these
answers.
Paul Murphy
Received on Sat Jan 17 2004 - 10:45:44 CST
