Wednesday, July 30, 2003, 1:19:31 PM, you wrote:
Q>> If you have 2 redo log groups with 4 members each, how many disks does
SK> Oracle recommend
SK> to keep the redo log files?
My first thought was 8, and I think you might be able to
make a case for 8. However, you should have at least 4,
because the whole reason for multiple members is have copies
on separate disks, so the maximum number of members in a
group ends up being the minimum number of disks, otherwise
you should reduce the number of members.
Does Oracle truly even make a recommendation with respect to
this question? Jacques Kilchoer came up with this quote from
the manuals:
When setting up a multiplexed online redo log, place
members of a group on different disks.
However, this quote does not speak to the total number of
disks. It says put each member of a group on a different
disk. Ok, fine, but either 4 or 8 disks will meet that
recommendation equally well.
It occurs to me though, that the question approaches the
issue all backwards. The implication is that you:
first decide how many members you have
secondly decide how many disks to spread those members
across
But who thinks like that that? I've always approached things
this way:
first I decided how many redundant copies I want of each
log file
then I create that many members, each on a separate
drive
My point here is that in real life, I don't think I'd ever
be asking myself the question Senthil posted from that
practice exam.
Best regards,
Jonathan Gennick --- Brighten the corner where you are
http://Gennick.com * 906.387.1698 * mailto:[EMAIL PROTECTED]
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