Re: [LMDB] Error 87 followed by MDB_PAGE_NOTFOUND

[Hallvard Breien Furuseth <h.b.furuseth@usit.uio.no>]

On 2014-01-29 23:10, Alain wrote:
> On Wed, Jan 29, 2014 at 4:36 PM, Hallvard Breien Furuseth
> <h.b.furuseth@usit.uio.no> wrote:
>
> > On 2014-01-29 16:58, Alain wrote:
> >
> > > While running our app (which seemed to be running slow on this last
> > > job), I ended up receiving an rc:87 on a commit, which my app 
> > > couldn't
> > > recover from. I have verified that I have free disk space, free RAM.
> >
> > Error numbers are OS-dependent. ÂWhat's errno 87?
> > E.g. what does this say: perl -le '$! = 87; print $!'
>
> I'm running under Windows and have perl only under Cygwin, so not
> sure if the results are meaningful, but I get:
> $ perl -le '$! = 87; print $!'
>  Cannot exec a shared library directly

Not meaningful, no.  Google(windows error 87) says
ERROR_INVALID_PARAMETER, which ought to mean a programmer
error in your application.

If this is code which worked previously, then maybe it lacks
error checking.  E.g. you're doing mdb_txn_begin()
which fails and you use the resulting txn anyway.

> > Which LMDB version and operating system do you use?
>
> I am at commit 5bda356, from 23 days ago and this is running under 
> Windows 7.
>
> > If the latest commit was bad, maybe previous one is
> > OK. ÂWe need to give mdb_copy an option to make a
> > backup using the oldest instead of youngest commit.
> > Then you'll lose just the last commit instead of
> > everything.
> >
> > That sounds good, as I'm thinking that this is the 2nd copy that 
> > Howard described during one of his presentation.

Yes.

--
Hallvard