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On 12/24/2010 3:14 PM, william humphrey wrote:
<blockquote
cite="mid:AANLkTikKGSgYsxyXYmn8zO+DAR0tdB5V_ettnaES=nS5@mail.gmail.com"
type="cite">Did the re-install and I'm still losing data whenever
there is a crash or anything other than proper shut-down from
LiveCode. I think maybe you added a feature that rolls back data
to the last proper close of database?
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</blockquote>
<br>
Well, as far as I understand...<br>
You are running vServer. And your app (livecode app) connects to
that vServer,<br>
do some inserts, updates, deletes against some database on that
vServer.<br>
<br>
Assume your app issues some "insert into t1 values..." sql
statement.<br>
Your app is passing this command to the vServer. vServer, in turn,
pass it to the vKernel level,<br>
and vKernel performs the actual job.<br>
But inserted values don't come to the disk immediately - it would be
too slow!<br>
They come to some internal valentina cache instead (it is absolutely
transparent process - no difference <br>
is data flushed to the disk or not. The data is available to your
app anyway.)<br>
<br>
There are two cases when the data comes to the disk:<br>
1. Flush command issued (Pay attention to auto-flush vServer mode -
see vServer's ini settings)<br>
2. Internally flushed (because of db is closed, no space in the
cache which requires to flush dirty pages and so on...)<br>
<br>
So if something bad happens (like crash or kill vServer) some data
may not be flushed to the disk and next start you<br>
see no such data in the db. <br>
Also pay attention that your app just provide commands and receives
results to/from vServer - so your app's crashes, <br>
hangs and so on means nothing to the db state.<br>
<br>
Also, I don't understand - why do you restart computer?<br>
Assume your app hangs - just kill it. You don't need to kill
vServer and moreover to restart computer.<br>
<br>
<pre class="moz-signature" cols="72">--
Best regards,
Ivan Smahin
Senior Software Engineer
Paradigma Software, Inc
Valentina - The Ultra-Fast Database
<a class="moz-txt-link-freetext" href="http://www.valentina-db.com">http://www.valentina-db.com</a></pre>
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