Re: Copying Tables

DS <bootybox@xxxxxxxxxxxxx> wrote in
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Bob Quintal wrote:
DS <bootybox@xxxxxxxxxxxxx> wrote in
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Bob Quintal wrote:


DS <bootybox@xxxxxxxxxxxxx> wrote in
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Bob Quintal wrote:


DS <bootybox@xxxxxxxxxxxxx> wrote in
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I have a question. My database is split. I want a backup
copy of my tables in another database on a different machine.
Should I use transferdatabase to get the info into the backup
copy or should I link the backup copy tables to the original
database? What happens if the original databse gets
corrupted? Can I get the table info into the original databse
easily? Any help appreciated, I'm still a little confused on
this issue. Thanks
DS


The best answer to that is neither transferdatabase nor
linking is a real backup solution. Simply exit the application
and copy the back end to your archive area usaing Windows.

I prefer to also rename the file to add a datestamp in hte
filename, so that you can keep last night's backup, and the
night before, and before. Often corruption will only manifest
itself several daya after occurence.

If your primary backup gets trashed, you simply copy the most
recent uncorrupted backup from the archive over the corrupt
.mdb


Thanks Bob,
So that is interesting. "Corruption will only manifest itesl
several days after occurence." I never knew that. So you can
be in truth operating with a corrupt database. I'd like to
know more about corruption.


Example: you have a record get corrupted on tuesday, and it only
gets detected when you run the weekly report on Friday There are
differing levels of corruption, some created by a glitch in the
computer, others are created by a user setting the wrong date
into a record.



The suggestion you gave is a good one, but the probem is that I
want a transaction by tranaction copy of my database so that I
can return to where I was before this happened. So, what
options are there? Thanks
DS


You're dealing with Access here, don't be too picky. If you have
a truly mission-critical application, you should use a dbms with
journalling, and automatic mirroring. These are a lot more
expensive than Access.

I'm not denigrating Access here, I believe that MS-Access is the
best you can buy in its price range, and better than much in
higher ranges. I'm just stating that it is not always the best
solution.


I'm sure your right, but at this point I really like Access a lot
and I don't have the time at this time to learn another
application. Most people seem to be using VB6 with an Access
back-end. So it looks like they aren't using te better stuff
either. I would at some point like to use a true client/server
but I heard the downside is that it needs a lot of maintance,
which my clients aren't prepared to do. So in the meantime I'm
trying to paste something together to protect the data up to the
last transaction. Thanks
DS


You could link to two back ends and use unbound forms for all
inserts and edits, writing the data to each back end in a
separate SQL statement. But that will only give you redundancy of
the records, not an audit trail.

You could set up an audit trail back end, logging every edit of
each field, with a date/time stamp added
http://www.mvps.org/access/modules/mdl0021.htm
http://allenbrowne.com/AppAudit.html

How many transactions do you project being made daily?

About 100 to 150 transactions. Actually I'm leaning or can I say
inching towards that. I gess thats what I mean by redundancy. I
don't need an audit trail, although I will look into what you
suggested. Always willing to learn. My only concern is with
linking, that means the network connection will always be open if
the back-end is on a seperate machine. Will it leave me open to
corruptin? Should I link then unlink on each transaction? Will
that be really slow? Thanks for your input.
DS

Opening and closing connections is very slow across a network.
Corruption by the network is not usually a problem, most often
corruption is caused by user error. (exiting by task manager, typing
illegal character strings, pressing the DELETE key 7,000 times in a
row, etc)


--
Bob Quintal

PA is y I've altered my email address.

--
Posted via a free Usenet account from http://www.teranews.com

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