Status of online redo logs on the standby database
- From: Christopher Reeve <topher_reeve@xxxxxx>
- To: oracle-L@xxxxxxxxxxxxx
- Date: Sun, 17 Jan 2010 08:01:15 -0700
Hello listers
My first post...
I have a data guard environment running on 10.2.0.4 on solaris 64. I have had
some performance issues, on the standby side of things, concerning the rate at
which redo is getting applied. Except for the disk subsystem, the box itself
is bored. So I'm trying to figure out how to reduce the physical I/O. The
environment itself is managed by the DG broker, and I have it set up to do real
time apply, which works great most of the time, until we get to our batch
processing periods, four times a month, then the standby begins to lag. One
way of reducing I/O, I have read, is to NOT multiplex the standby redo logs.
Certainly makes sense, with all the ways of getting redo over. While that did
improve performance and reduce I/O, I'm still experiencing periods of lag. Is
that enough background information? OK, on to the question...
With my situation, real-time apply, etc., I expected to see activity in
v$standby_log, which I do. But I didn't expect to see activity in v$log, which
I do. I have not seen any status here besides "CLEARING" and
"CLEARING_CURRENT". So is this normal? If not, is this causing additional I/O
that I can reduce further?
Thanks,
Topher
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