IDS Forum

Re: Any help on this would be great !

Posted By: Martin Fuerderer
Date: Tuesday, 23 December 2003, at 5:04 a.m.

In Response To: Any help on this would be great ! (Mike Smith )

Hi,

have you checked, how long your server actually is in the recovery ?

This effect seems to be caused by the server doing quite some work
during the log rollback phase. When the logical logs have all be restored
and the log records have been applied, then the server checks for (still)
open transactions. If any such transactions are found they will now be
rolled back to get the system to a consistent state.
Depending on how many open transactions there were at the time and
how long these have been, this rollback will take some time (it can take
even hours, though that has been seen seldomly).
In the meantime ON-Bar is waiting for the server to finish up and get
into quiescent mode. However, ON-Bar does not know how much
rollback work the server has to do. Therefore it waits for a certain time
(seems to be 5 seconds which are not changable) and then retries the
server check 3 times. This number of retries can be configured in
$ONCONFIG by setting parameter BAR_RETRY (default is 3).
[ However, this value is most probably used by ON-Bar for other
"retry-occasions" as well. So adjusting the value may cause unexpected
side-effects. ]

[ Contrary to ON-Bar, ontape does not wait for the server to finish the
log rollback phase. It will exit rather immediately and return the
command
prompt to you. Sometimes you can then see (onstat -) that the server
is still in recovery ... ]

Important in the end is, that eventually the server will become
"quiescent"
which means that everything worked fine. You can also check the message
log file (see MSGPATH parameter in your $ONCONFIG for file location).

TIA,
Martin
--
Martin Fuerderer
IBM Informix Development Munich
Data Management Solutions





"Mike Smith " <idsquiz@yahoo.com>
Sent by: forum.subscriber@iiug.org
23.12.2003 01:21


To: ids@iiug.org
cc:
Subject: Any help on this would be great ! [2387]



Could some one figure this out ? Here is the scenario, on my restore
everything works fine. Only thing is that I do not see the usual message
in the bar_act.log for each logical log restore stating that it completed
all the logical logs, it only shows the last logicat log been restored in
this case 4503. There are about 15 other logical logs that shows on the
ixbar.o file prior to logical log number 4503 and after the very last
dbspace.

2003-12-22 08:54:03 3393 3391 /opt/informix/IDS_9.30.UC3/bin/onbar_d -r
2003-12-22 08:54:04 3393 3391 Successfully connected to Storage Manager.
2003-12-22 08:54:05 3393 3391 Begin salvage for log 4503.
2003-12-22 08:54:06 3393 3391 Completed salvage of logical log 4503.
2003-12-22 08:54:08 3393 3391 Successfully connected to Storage Manager.
2003-12-22 08:54:50 3393 3391 Begin cold level 0 restore rootdbs
(Storage Manager copy ID: 1072100595 1072100596).
2003-12-22 08:55:05 3393 3391 Completed cold level 0 restore rootdbs.
2003-12-22 08:55:23 3393 3391 Begin cold level 0 restore dbspace1
(Storage Manager copy ID: 1072100732 1072100734).
2003-12-22 08:59:16 3393 3391 Completed cold level 0 restore dbspace1.
2003-12-22 08:59:17 3393 3391 Successfully connected to Storage Manager.
2003-12-22 08:59:21 3393 3391 Begin restore logical log 4503 (Storage
Manager copy ID: 1072101244 1072101245).
2003-12-22 08:59:29 3393 3391 Completed restore logical log 4503.
2003-12-22 08:59:36 3393 3391 Completed logical restore.
2003-12-22 08:59:36 3393 3391 ON-Bar is waiting for the database server
to exit fast recovery mode.
2003-12-22 08:59:42 3393 3391 ON-Bar is waiting for the database server
to exit fast recovery mode.
2003-12-22 08:59:47 3393 3391 ON-Bar is waiting for the database server
to exit fast recovery mode.
2003-12-22 08:59:59 3393 3391 /opt/informix/IDS_9.30.UC3/bin/onbar_d
complete, r

---------------------------------

Messages In This Thread

• Any help on this would be great !
  Mike Smith -- Monday, 22 December 2003, at 7:21 p.m.
  • Re: Any help on this would be great !
    Martin Fuerderer -- Tuesday, 23 December 2003, at 5:04 a.m.

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