[elephant-devel] Database trouble

[Aslak Gronflaten]

Hi,

thanks for the reply!
I've tried wrapping my get-instances, that's fine and will work for now.
I've tried ugrading elephant - that did not work at all - unable to open the
db at all - but I don't have the details here, I'll try a bit harder, and if
I get stuck I might post separately about this.
Rebuilding indices sounds interesting - I'll investigate in how to do this!

Thanks ,
  Aslak

On Thu, Apr 23, 2009 at 5:36 PM, Leslie P. Polzer
<sky at viridian-project.de>wrote:

>
> > I've been using elephant 0.91 for quite a while now, with a berkeley 4.6
> > backend, and it's been a joy.
>
> Great! :)
>
>
> > Recently however, as usage has gone up, some problems have started
> occuring.
> > One big problem has been that when I run (get-instances-by-class 'foo) I
> get
> > a list of foo, but with some nil's occuring as well.
> > Is this a sign of database corruption?
>
> Not necessarily, I'd rather guess at a bug in the indexing mechanism
> that has been solved by now.
>
>
> > How do I remedy this?
>
> Some possible solutions:
>
>  * upgrade your Elephant
>
>  * rebuild your indices
>
>  * wrap your get-instances stuff in a function that removes
>    the NIL entries
>
>
> > I've tried running both the recover and checkpoint tools on the db, but
> > no change.
>
> No, that won't help. :)
>
>
> > I've experienced deadlocks as well, and had to kill my sbcl
>
> FYI you can prevent deadlocks from appearing.
>
>
> > - wondering if that (non clean shutdown) is what caused the problems
> > in the first place.
>
> I don't think so.
>
>
> > Or is this something to do with indexes - could they be remade somehow?
>
> I think there was an easy way but I can't remember it right now...
>
>  Cheers,
>
>    Leslie
>
> --
> LinkedIn Profile: http://www.linkedin.com/in/polzer
> Xing Profile: https://www.xing.com/profile/LeslieP_Polzer
> Blog: http://blog.viridian-project.de/
>
>


-- 
Mvh Aslak
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