DOWN TIME WITH OPS

제품 : ORACLE SERVER
작성날짜 : 1995-04-13
Subject : DOWN TIME With OPS
I can only answer in a generic format. First, to understand how long fail
over will take, you must first understand the different operations that
takes place on fail over. My short answer would be, no, a 5 second average
down time is not feasible. My long answer is, it depends:
1) How long does it take for the other node(s) to realize that a node in
the cluster is down?
2) How long it takes to "remaster" the locks?
3) How long does it take for Oracle to perform instance recovery?
All of these play a part on how long fail over will take. My testing on fail over
has been focused on Pyramid's, but I believe it should be the same.
#1 is a tunable parameter - how often do you want each node in the cluster
to send a heart beat across to the other nodes? On our machines, it's
     set to 20 seconds before cluster rebuild and remastering of locks
     occur if a node goes down.
#2 Only takes minutes at most. I've been testing remastering of locks any
     where between 1000 locks -> 200,000 locks and worst case scenario
     (remastering all 200,000 locks) has only taken less than 4 minutes.
Setting gc_db_locks = 1000 only took seconds to remaster the locks.
#3 is probably the most time consuming. It's really dependent upon how much
     redo has been generated and I don't have any timing statistics on
     this.
A few things that we need to realize is that not all the locks may need to be
remastered - only the locks which were found "dubious" so the timing
statistics I gave on that are worst case scenario's for remastering locks.
Also, there's a possibility of absolutely no wait time if the data block
you're trying to access is mastered by a node which is up and running.

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