I wouldn't want to try this when the original database and clone database
are on the same host. Issuing that drop statement on the cloned might touch
the standby log in use by the original standby.
On Oct 5, 2015 7:03 PM, "Kenny Payton" <k3nnyp@xxxxxxxxx> wrote:
Have you tried dropping the standby redo logs. The ones that throw the
error you should be able to clear and then drop.
We do this fairly frequently with snaps of our physical standbys on Netapp.
Something like this would generate the statements although the clear is
only really necessary for the log groups that are causing you a problem.
select distinct 'alter database clear logfile group
'||group#||';'||chr(10)||'alter database drop standby logfile group
'||group#||';' from v$logfile where type = 'STANDBY'
You should be able to do this on the snapshot of the standby after your
initial mount. Then you can go on to activating it.
Here are some partial notes we use.
startup mount
clear/drop the standby redologs
alter database activate standby database;
alter database set standby database to maximize performance;
alter system set job_queue_processes = 0;
alter system set log_archive_dest_state_2=defer;
alter system set log_archive_dest_state_3=defer;
alter system set log_archive_dest_state_4=defer;
alter database open;
On Oct 5, 2015, at 5:56 PM, Mark W. Farnham <mwf@xxxxxxxx> wrote:
Late to the thread. Is the exact startup rename command you’re using
appear in the thread somewhere?
When using less than crash recovery (ie. complete recovery) suitable
files, does your command include the phrase “using backup controlfile?”
*From:* oracle-l-bounce@xxxxxxxxxxxxx [
mailto:oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx>] *On
Behalf Of *Don Seiler
*Sent:* Monday, October 05, 2015 5:20 PM
*To:* Jeremy Schneider
*Cc:* ORACLE-L
*Subject:* Re: Snapshot Thin Clone of Physical Standby
So in the case of the source DB being a primary (or standalone) DB, we can
just mount the cloned controlfile, rename the datafiles/logs (if needed)
and then open it and let it do crash recovery.
If the source DB is a physical standby, we can create a new controlfile
and open resetlogs.
Either way we then do a DBNEWID so we'd be doing a resetlogs anyway. I'm
curious why the CREATE CONTROLFILE option has problems when the source is a
primary, but at least for now we have something that works.
Thanks again everyone.
Don.
On Mon, Oct 5, 2015 at 1:25 PM, Don Seiler <don@xxxxxxxxx> wrote:
Ironically now, when I take the method we have for creating a new
controlfile and apply it to cloning from a primary database, it tells me
that datafile 1 needs more recovery when I try to open resetlogs. I even
tried putting the primary into backup mode first just to see if that was
it, but I got the same error. All the online redo logs were in the same
snapshot as the datafiles (same protection group), but it doesn't seem to
want to use them. No errors/complaints from the CREATE CONTROLFILE
statement.
The one thing that I'm curious about is that we ARE changing the DB name
in the CREATE CONTROLFILE statement. Would that impact our ability to use
the online redo logs that were snapshotted?
Don.
On Mon, Oct 5, 2015 at 11:54 AM, Jeremy Schneider <
jeremy.schneider@xxxxxxxxxxxxxx> wrote:
On Fri, Oct 2, 2015 at 3:32 PM, Don Seiler <don@xxxxxxxxx> wrote:
Jeremy, I'm curious why a backup primary controlfile would work whenwhen
recreating a controlfile would not. We've tried the latter and that's
it said we had incomplete media recovery. Why would the backup primary
controlfile not also have the same issue?
On Mon, Oct 5, 2015 at 10:56 AM, Don Seiler <don@xxxxxxxxx> wrote:
Seth, that did appear to work now when I create a new controlfile. I'llsee
how best to script that part of it.
Glad to hear it started working! I couldn't think if any reason that a
create controlfile shouldn't work. Just was pointing out that the
primary controlfile backup works routinely for me to avoid the issue
with standby controlfile backups.
-J
--
http://about.me/jeremy_schneider
was
On Fri, Oct 2, 2015 at 2:26 PM, Don Seiler <don@xxxxxxxxx> wrote:
To answer your question, no we didn't try the copy-controlfile-from-prod
method. I'll look into that.
Don.
On Fri, Oct 2, 2015 at 1:56 PM, Don Seiler <don@xxxxxxxxx> wrote:
In 11.2 I used to be able to mount the clone, and if the controlfile
thea standby I would just backup the controlfile and restore it from that
backup and (voila) it would now be a primary. That doesn't seem to be
this,case in 12.1 now. Not sure if that alone is at the root of the problem.
I was hoping to avoid having to connect to any source databases for
just bebut maybe there's no away around it. It would have been cleaner to
clonedable to snapshot from the storage array and do all the work from the
instance.
Don.
On Fri, Oct 2, 2015 at 12:43 PM, Jeremy Schneider
<jeremy.schneider@xxxxxxxxxxxxxx> wrote:
On Fri, Oct 2, 2015 at 12:36 PM, Don Seiler <don@xxxxxxxxx> wrote:
ORA-01511: error in renaming log/data files
ORA-00261: log 52 of thread 1 is being archived or modified
well it's nice to hear that this problem still exists in 12c - i'm
very aware of it in 11.2.0.3
it's because the software isn't really able to handle the standby log
which is currently active. i have run into the exact same issue doing
a "recover datafile" on a clone which was created using a backup
controlfile from the standby. in my case, i simply used the backup
from the primary (and changed nothing else) and i don't have the
issue.
So we go to plan B, which is to try to create a new controlfile. The
new
CREATE CONTROLFILE script doesn't specify the standby redo logs.
ERROR at line 1:
ORA-01196: file 1 is inconsistent due to a failed media recovery
session
ORA-01110: data file 1: '/file/name/here.dbf'
Every variation of this that we've tried fails similarly.
So you did also try taking a backup of the primary controlfile and
restoring this into the standby, then renaming all your logfiles and
datafiles to match the new locations? That has worked for me on 11203
for avoiding the error you mentioned above.
-J
--
http://about.me/jeremy_schneider
--
Don Seiler
http://www.seiler.us
--
Don Seiler
http://www.seiler.us
--
Don Seiler
http://www.seiler.us
--
Don Seiler
http://www.seiler.us
--
Don Seiler
http://www.seiler.us
