<div dir="ltr">Johannes, <div><br></div><div>+1, purging should help here a lot. </div><div><br></div><div><br></div><div>Best regards,</div><div>Boris Pavlovic </div></div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Fri, Oct 25, 2013 at 2:01 AM, Johannes Erdfelt <span dir="ltr"><<a href="mailto:johannes@erdfelt.com" target="_blank">johannes@erdfelt.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im">On Fri, Oct 25, 2013, Michael Still <<a href="mailto:mikal@stillhq.com">mikal@stillhq.com</a>> wrote:<br>
> On Fri, Oct 25, 2013 at 8:19 AM, Johannes Erdfelt <<a href="mailto:johannes@erdfelt.com">johannes@erdfelt.com</a>> wrote:<br>
> > On Fri, Oct 25, 2013, Michael Still <<a href="mailto:mikal@stillhq.com">mikal@stillhq.com</a>> wrote:<br>
><br>
> >> However, when I run it with medium sized (30 million instances)<br>
> >> databases, the change does cause a 10 minute downtime. I don't<br>
> >> personally think the change is worth such a large outage, but perhaps<br>
> >> everyone else disagrees.<br>
> ><br>
> > I'm not sure how you could have 30 million instances. That's a lot of<br>
> > hardware! :)<br>
><br>
> This has come up a couple of times on this thread, so I want to<br>
> reinforce -- that database is a real user database. There are users<br>
> out there _right_now_ with 30 million rows in their instance tables<br>
> and using nova quite happily. Now, not all those instances are<br>
> _running_, but they're still in the table.<br>
<br>
</div>Why no pruning?<br>
<br>
The easiest way to reduce the amount of time migrations take to run is<br>
to reduce the amount of rows that need to be migrated.<br>
<br>
The amount of unnecessary data in tables has been steadily increasing.<br>
I'm looking at you reservations table.<br>
<span class="HOEnZb"><font color="#888888"><br>
JE<br>
</font></span><div class="HOEnZb"><div class="h5"><br>
<br>
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