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IDS Forum

Re: Logical Log files MISSING

Posted By: Martin Fuerderer
Date: Monday, 13 October 2008, at 5:05 a.m.

In Response To: Re: Logical Log files MISSING (Davis Kwong)

Hi,

most likely (> 98%), the problem is what Davis described
in his answer (see below). If you want to be 100% sure,
then you have to modify your alarm program script (or
whatever script/program actually executes the ontape
command) to capture the output of the ontape processes
in a file. If you see messages indicating that some
temporary file cannot be renamed and/or removed
because it does not exist (errno 2), then this is the
described problem.

Besides taking a level-0 archive when the situation of
log file backup loss occured, you may consider the
following to improve the situation:

a) in your script/program add some code to first
check whether an "ontape -a -d" command is already
being executed (e.g. using "ps ..." output). If so, then
do not start a new "ontape -a -d". The one that is
running will backup all the used log files anyway
(except the current log file).
Note: this is not 100% error proof as there still is a

gap between checking for a running "ontape -a -d"

process and starting a new one.

b) Capture all ontape output (stdout and stderr) to a
file and put in your alarm program some additional
code to check this file for above dscribed errors.
If such an error is detected, write a warning (to online.log
or whatever) because now surely it is time to do a
level-0 archive ...
Note: this may also not bee 100% error proof. An error

may still slip your attention. It highly depends on the

implementation of the error checking/scanning ...

c) The respective defect is: idsdb00165611 (for IDS 11.10).
While in the upcoming 11.50.xC3 this is fixed already,
you may contact IBM Informix Tech Support (check
your contract) to get a fix of this problem for
your IDS 11.10 ...

Regards,
Martin
--
Martin Fuerderer
IBM Informix Development Munich, Germany
Information Management

IBM Deutschland Research & Development GmbH
Chairman of the Supervisory Board: Martin Jetter
Board of Management: Erich Baier
Corporate Seat: Boeblingen, Germany
Reg.-Gericht: Amtsgericht Stuttgart, HRB 243294

ids-bounces@iiug.org wrote on 10.10.2008 21:55:01:

> ids-bounces@iiug.org wrote on 10/10/2008 10:01:44 AM:
>
> > Hello,
> >
> > IDS 11.10.FC2W4 on solaris 10
> >
> > Ontape for backing up of logical log files to a directory using the
> > alarmprogram.sh script
> >
> > I see that manyyy logical log files are missing from the logical log
> backup
> > directory..
> >
> > -rw-rw---- 1 informix informix 20578304 Oct 7 23:11
> proddb_1_Log0000020073
> > -rw-rw---- 1 informix informix 20578304 Oct 7 23:11
> proddb_1_Log0000020074
> > -rw-rw---- 1 informix informix 20578304 Oct 7 23:11
> proddb_1_Log0000020075
> > -rw-rw---- 1 informix informix 20578304 Oct 7 23:11
> proddb_1_Log0000020076
> > -rw-rw---- 1 informix informix 20578304 Oct 7 23:11
> proddb_1_Log0000020077
> > -rw-rw---- 1 informix informix 20578304 Oct 7 23:11
> proddb_1_Log0000020078
> > -rw-rw---- 1 informix informix 20578304 Oct 7 23:12
> proddb_1_Log0000020079
> > -rw-rw---- 1 informix informix 20578304 Oct 7 23:12
> proddb_1_Log0000020080
> > -rw-rw---- 1 informix informix 20578304 Oct 7 23:12
> proddb_1_Log0000020081
> > -rw-rw---- 1 informix informix 20578304 Oct 7 23:12
> proddb_1_Log0000020082
> > -rw-rw---- 1 informix informix 20578304 Oct 7 23:12
> proddb_1_Log0000020083
> > -rw-rw---- 1 informix informix 20578304 Oct 7 23:12
> proddb_1_Log0000020085
> > -rw-rw---- 1 informix informix 20578304 Oct 7 23:12
> proddb_1_Log0000020086
> > -rw-rw---- 1 informix informix 20578304 Oct 7 23:12
> proddb_1_Log0000020087
> > -rw-rw---- 1 informix informix 20578304 Oct 7 23:12
> proddb_1_Log0000020088
> >
> > i checked in onstat -l and found that log with uniqid
> >
> > a3180d77e0 142 U-B---- 20066 5:1290053 10000 10000 100.00
> > a3180d7848 143 U-B---- 20067 5:1300053 10000 10000 100.00
> > a3180d78b0 144 U-B---- 20068 5:1310053 10000 10000 100.00
> > a3180d7918 145 U-B---- 20069 5:1320053 10000 10000 100.00
> > a3180d7980 146 U-B---- 20070 5:1330053 10000 10000 100.00
> > a3180d79e8 147 U-B---- 20071 5:1340053 10000 10000 100.00
> > a3180d7a50 148 U-B---- 20072 5:1350053 10000 10000 100.00
> > a3180d7ab8 149 U-B---- 20073 5:1360053 10000 10000 100.00
> > a3180d7b20 150 U-B---- 20074 5:1370053 10000 10000 100.00
> > a3180d7b88 151 U-B---- 20075 5:1380053 10000 10000 100.00
> > a3180d7bf0 152 U-B---- 20076 5:1390053 10000 10000 100.00
> > a3180d7c58 153 U-B---- 20077 5:1400053 10000 10000 100.00
> > a3180d7cc0 154 U-B---- 20078 5:1410053 10000 10000 100.00
> > a3180d7d28 155 U-B---- 20079 5:1420053 10000 10000 100.00
> > a3180d7d90 156 U-B---- 20080 5:1430053 10000 10000 100.00
> > a3180d7df8 157 U-B---- 20081 5:1440053 10000 10000 100.00
> > a3180d7e60 158 U-B---- 20082 5:1450053 10000 10000 100.00
> > a3180d7ec8 159 U-B---- 20083 5:1460053 10000 10000 100.00
> > a3180d7f30 160 U-B---- 20084 5:1470053 10000 10000 100.00
> > a3180d7f98 161 U-B---- 20085 5:1480053 10000 10000 100.00
> > a3180d8028 162 U-B---- 20086 5:1490053 10000 10000 100.00
> > a3180d8090 163 U-B---- 20087 5:1500053 10000 10000 100.00
> > a3180d80f8 164 U-B---- 20088 5:1510053 10000 10000 100.00
> >
> > So the Logical log 20084 is missing from the logical log backup
> directory.
> > and there are manyyyy more...
> > Plssss let me know what could be the reason and what more do i have to

> look
> > for.
>
> This is a bug that is fixed in 11.50xC3
>
> The problem is that when log files are filled rapidly (matter of
seconds)
> and
> the alarmprogram.sh is used to perform automatic ontape backup to
> directory,
> the alarmprogram.sh which invokes ontape may cause ontape to run when
> there,
> is already another ontape running that is backing up a logfile to
> directory.
> This can cause the loss of the logfile that was being backed up by the
> ontape that was already running.
>
> The current workaround is that when this is detected, take a level 0
> archive.
> Since you are on 11.10, I'll see if we can backport the fix to 11.10.
>
> Thanks. Davis.
>
> >
> > the logical log directory has RWX to user and group informix and no
other
> than
> > the dbas so at first i dont think any one would delete that log.
> >
> > any idea what should i do with this ....
> >
> >
> >
>
>
*******************************************************************************
>
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
>
>
>
*******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>

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