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From: Mark Hahn <mark@boutiquing.com>
Date: Tue, 5 Jul 2011 14:44:06 -0700
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Subject: Re: few doubts
To: user@couchdb.apache.org
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Cool.  That is much easier.  Still a bit of a pain.  It would be nice if it
did this automatically on every view change.

On Tue, Jul 5, 2011 at 2:31 PM, Sean Copenhaver
<sean.copenhaver@gmail.com>wrote:

> CouchDB actually relates a design document to it's views by I believe a
> hash
> of the design document contents (not the id). The wiki actually has a how
> to
> for deploy view changes in a live environment:
>
>
> https://wiki.apache.org/couchdb/How_to_deploy_view_changes_in_a_live_envi=
ronment
>
> On Tue, Jul 5, 2011 at 5:17 PM, Mark Hahn <mark@boutiquing.com> wrote:
>
> > > With CouchDB, all you have to do is to create your view within a desi=
gn
> > document and it will on its own build the actual "indices" (the views)
> the
> > very first time that those views are actually being used.  The next tim=
e
> > that those views are used, then only newly created and/or updated docs
> need
> > to be indexed.
> >
> > Actually, if you change a view in the design doc it rebuilds ALL views =
in
> > that doc from scratch for ALL documents.  This was a surprise to me the
> > first time it happened because my entire application froze up for sever=
al
> > minutes.  I can imagine it happening for an hour with a giant db.  The
> only
> > way I can figure out how to get around this problem is to create a seco=
nd
> > db, sync the main db to the second, rebuild the views on the second and
> > then
> > overwrite the main db file with the second db file.  Kind of a pain.
> >
> > On Tue, Jul 5, 2011 at 11:17 AM, Randall Leeds <randall.leeds@gmail.com
> > >wrote:
> >
> > > I like everything you've said in these last three messages which were
> > > meant to be one. :)
> > > You should make it a blog post. For real.
> > >
> > > On Tue, Jul 5, 2011 at 00:32, Zdravko Gligic <zgligic@gmail.com>
> wrote:
> > > > oh, i hate gmail, as it seems to react to certain key combinations
> ...
> > > >
> > > > Focus - It seems that CouchDB has been purposely designed with
> "single
> > > > mindedness in mind".  The approach seems to be that it can be most
> > > > efficient if its various functions and its various tasks do small
> > > > amounts of work in the most efficient way possible.  So, it would
> seem
> > > > that writes keep on writing to the end of file, instead of flipping
> > > > through it and trying to over-write and update in place existing
> docs.
> > > >  Again, in order to be as efficient as it can be with those writes,
> it
> > > > foregoes updating the views (the same way that an RDBMS would updat=
e
> > > > all of the related indices as part of its record update) and leaves
> it
> > > > for another process which will concentrate on doing just that.  So,
> it
> > > > seems that "context switching" or not having to do much of such
> > > > switching is where it gets lots of it processing efficiency.
> > > >
> > > > Again, I am most anxious to see how my noob understandings check ou=
t
> > > > with technical realities.  ;)
> > > >
> > > > HTH,
> > > > teslan
> > > >
> > >
> >
>
>
>
> --
> =93The limits of language are the limits of one's world. =93 -Ludwig von
> Wittgenstein
>

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