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How to corrupt a MS Access database file in a 'normal' way?

Here is the situation: I wrote a VB programm, which stores all the
information in a single Access database file using jet engine. It
worked well, however one of my customs reported that there was some
problems with this programm. I checked, the log files showed that the
database was corrupted.

The customer told me that there no 'illegal' operation such as pull out
the plug, or kill the programm via task manager...

So is there any possible normal operation which could corrupt the
database? such as 'Weird characters' I guess? (The custom is from
Italy, is there any special Italian chars could do this?)

Of course it is possible that there are some bugs in the programm,
which possibly caused a error may corrupt the database file, but still,
how? The program wasn't stopped violently anyway ...

Anyone could give some idea about this? Since it is rather hard to talk
to Italians... So I can not completely investigate 'what they did about
the program'... I have to check the program and potential operations
which may corrupt the database.

Thanks a lot.

Jul 18 '06 #1
17 4902
shineofleo wrote:
The customer told me that there no 'illegal' operation such as pull out
the plug, or kill the programm via task manager...
Of course it is possible that there are some bugs in the programm,
which possibly caused a error may corrupt the database file, but still,
how? The program wasn't stopped violently anyway ...

Since it is rather hard to talk to Italians.
Did anyone head-butt the computer in involved?

Fifty per cent of the time people are unaware of illegal or violent
computer activity. The other fifty per cent of the time they lie about
it.

Jul 18 '06 #2
Lol, thank you for your humours reply.

Honestly, I do hope they didn't tell the truth, which is much easier
for me. In addition, this software has been used for a long time, and
there is no other customers who complained about this.

However, this time they said the similar problem repeated 4 times....
The first time I get the database file back, and tried to open it in
Access, it is said 'corrupted database file, do you want to fix it?' i
chose fix, then everything went back to normal. But 4 times... I
started to worry about if there is something goes wrong in my code.

Well, I don't think they would do the stupid thing 4 times... Or,
maybe... who knows...

But I just want to know the possible answer to this question, assuming
that the customers are telling the truth.

Lyle Fairfield :
shineofleo wrote:
The customer told me that there no 'illegal' operation such as pull out
the plug, or kill the programm via task manager...
Of course it is possible that there are some bugs in the programm,
which possibly caused a error may corrupt the database file, but still,
how? The program wasn't stopped violently anyway ...

Since it is rather hard to talk to Italians.

Did anyone head-butt the computer in involved?

Fifty per cent of the time people are unaware of illegal or violent
computer activity. The other fifty per cent of the time they lie about
it.
Jul 18 '06 #3
"shineofleo " <li*********@gm ail.comwrote in
news:11******** **************@ 35g2000cwc.goog legroups.com:
So is there any possible normal operation which could corrupt the
database?
No, but bad versions of Jet on the machines using the VB app could
lead to significant risk of corruption. Jet 4 SP6 or SP8 is required
for reliable operation of Jet 4 (SP8 is the bug fix for the useless
SP7; SP7-8 add no real stability, only the security fixes to make
Jet less vulnerable to executing dangerous code).

--
David W. Fenton http://www.dfenton.com/
usenet at dfenton dot com http://www.dfenton.com/DFA/
Jul 18 '06 #4
Thank you... But we deliver the whole PC to the customer... Now I am
trying to 'recreate' the bad result just like the customer, but no good
news... sigh....

David W. Fenton 写道:
"shineofleo " <li*********@gm ail.comwrote in
news:11******** **************@ 35g2000cwc.goog legroups.com:
So is there any possible normal operation which could corrupt the
database?

No, but bad versions of Jet on the machines using the VB app could
lead to significant risk of corruption. Jet 4 SP6 or SP8 is required
for reliable operation of Jet 4 (SP8 is the bug fix for the useless
SP7; SP7-8 add no real stability, only the security fixes to make
Jet less vulnerable to executing dangerous code).

--
David W. Fenton http://www.dfenton.com/
usenet at dfenton dot com http://www.dfenton.com/DFA/
Jul 18 '06 #5
The last time I got called out to a serious case of
database corruption, the users didn't realise that
having the computer stop and restart itself a couple
of times a day was anything worth commenting about.

You always have to be aware that Access is uniquely
sensitive to faulty networks, you always have to
listen carefully to users, but never accept anything
they say at face value: they aren't computers, and
they aren't literal like a computer program.

(david)
"shineofleo " <li*********@gm ail.comwrote in message
news:11******** **************@ 35g2000cwc.goog legroups.com...
Here is the situation: I wrote a VB programm, which stores all the
information in a single Access database file using jet engine. It
worked well, however one of my customs reported that there was some
problems with this programm. I checked, the log files showed that the
database was corrupted.

The customer told me that there no 'illegal' operation such as pull out
the plug, or kill the programm via task manager...

So is there any possible normal operation which could corrupt the
database? such as 'Weird characters' I guess? (The custom is from
Italy, is there any special Italian chars could do this?)

Of course it is possible that there are some bugs in the programm,
which possibly caused a error may corrupt the database file, but still,
how? The program wasn't stopped violently anyway ...

Anyone could give some idea about this? Since it is rather hard to talk
to Italians... So I can not completely investigate 'what they did about
the program'... I have to check the program and potential operations
which may corrupt the database.

Thanks a lot.

Jul 18 '06 #6
"LeonC" <li*********@gm ail.comwrote in
news:11******** **************@ 35g2000cwc.goog legroups.com:
David W. Fenton ???
>"shineofleo " <li*********@gm ail.comwrote in
news:11******* *************** @35g2000cwc.goo glegroups.com:
So is there any possible normal operation which could corrupt
the database?

No, but bad versions of Jet on the machines using the VB app
could lead to significant risk of corruption. Jet 4 SP6 or SP8 is
required for reliable operation of Jet 4 (SP8 is the bug fix for
the useless SP7; SP7-8 add no real stability, only the security
fixes to make Jet less vulnerable to executing dangerous code).

Thank you... But we deliver the whole PC to the customer... Now I
am trying to 'recreate' the bad result just like the customer, but
no good news... sigh....
Well, lots of the corruption problems will show up only in a
multi-user scenario, so you can't expect to be able to recreate it
in a single-user scenario.

Secondly, the corruption problems could be caused by the software
configuration of the *server* on which the shared data MDB is
stored.

I would assume, of course, that you're not sharing the front end
MDB.

Check out Tony Toews excellent corruption FAQ:

http://www.granite.ab.ca/access/corruptmdbs.htm

--
David W. Fenton http://www.dfenton.com/
usenet at dfenton dot com http://www.dfenton.com/DFA/
Jul 18 '06 #7
Thank you guys! It is quite helpful!

Now I have narrowed down the cause to some point. I created the
corruption by shutting down the windows (normal procedure i think) with
the program running. However it is not strictly repeatable, when I try
the second time, it is normal again...

Technically, when the program is called to be closed, firstly it will
delete some 'pre-tagged' records in the database. I guess the datadase
operation is not fast enough to be completed, before the windows is
off.

My problem is how to generate the corruption by common termination of a
program... Any idea?

David W. Fenton 写道:
"LeonC" <li*********@gm ail.comwrote in
news:11******** **************@ 35g2000cwc.goog legroups.com:
David W. Fenton ???
"shineofleo " <li*********@gm ail.comwrote in
news:11******** **************@ 35g2000cwc.goog legroups.com:

So is there any possible normal operation which could corrupt
the database?

No, but bad versions of Jet on the machines using the VB app
could lead to significant risk of corruption. Jet 4 SP6 or SP8 is
required for reliable operation of Jet 4 (SP8 is the bug fix for
the useless SP7; SP7-8 add no real stability, only the security
fixes to make Jet less vulnerable to executing dangerous code).
Thank you... But we deliver the whole PC to the customer... Now I
am trying to 'recreate' the bad result just like the customer, but
no good news... sigh....

Well, lots of the corruption problems will show up only in a
multi-user scenario, so you can't expect to be able to recreate it
in a single-user scenario.

Secondly, the corruption problems could be caused by the software
configuration of the *server* on which the shared data MDB is
stored.

I would assume, of course, that you're not sharing the front end
MDB.

Check out Tony Toews excellent corruption FAQ:

http://www.granite.ab.ca/access/corruptmdbs.htm

--
David W. Fenton http://www.dfenton.com/
usenet at dfenton dot com http://www.dfenton.com/DFA/
Jul 19 '06 #8
Personally I'd log activity.

Log when they start the app, log when they stop the app. If you have more
starts than stops then they aren't exiting cleanly.
--

Terry Kreft
"LeonC" <li*********@gm ail.comwrote in message
news:11******** **************@ h48g2000cwc.goo glegroups.com.. .
Thank you guys! It is quite helpful!

Now I have narrowed down the cause to some point. I created the
corruption by shutting down the windows (normal procedure i think) with
the program running. However it is not strictly repeatable, when I try
the second time, it is normal again...

Technically, when the program is called to be closed, firstly it will
delete some 'pre-tagged' records in the database. I guess the datadase
operation is not fast enough to be completed, before the windows is
off.

My problem is how to generate the corruption by common termination of a
program... Any idea?

David W. Fenton ??:
"LeonC" <li*********@gm ail.comwrote in
news:11******** **************@ 35g2000cwc.goog legroups.com:
David W. Fenton ???
"shineofleo " <li*********@gm ail.comwrote in
news:11******** **************@ 35g2000cwc.goog legroups.com:

So is there any possible normal operation which could corrupt
the database?

No, but bad versions of Jet on the machines using the VB app
could lead to significant risk of corruption. Jet 4 SP6 or SP8 is
required for reliable operation of Jet 4 (SP8 is the bug fix for
the useless SP7; SP7-8 add no real stability, only the security
fixes to make Jet less vulnerable to executing dangerous code).
Thank you... But we deliver the whole PC to the customer... Now I
am trying to 'recreate' the bad result just like the customer, but
no good news... sigh....

Well, lots of the corruption problems will show up only in a
multi-user scenario, so you can't expect to be able to recreate it
in a single-user scenario.

Secondly, the corruption problems could be caused by the software
configuration of the *server* on which the shared data MDB is
stored.

I would assume, of course, that you're not sharing the front end
MDB.

Check out Tony Toews excellent corruption FAQ:

http://www.granite.ab.ca/access/corruptmdbs.htm

--
David W. Fenton http://www.dfenton.com/
usenet at dfenton dot com http://www.dfenton.com/DFA/

Jul 19 '06 #9

If you are running the backend off a server, a intermittent network
connection or flakey network card will cause corruption regularly.
Other applications seem to be able to live with a less than perfect
network connection but Access isn't so tolerant.

Hope this helps.

Jul 19 '06 #10

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