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Subject: Re: Are attachments duplicated for each revision as well?
From: Brian Mitchell <brian@standardanalytics.io>
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 <CA+T+PjEbDvLbrQzZQ9QeWHt4EGCzKpZjAzeaiBUh_vWB67yWcQ@mail.gmail.com>
Date: Wed, 1 Oct 2014 16:02:11 -0400
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To: user@couchdb.apache.org

The attachment will be stored once and each revision will retain a =
reference to that attachment (including when it was added,
called revpos, so replication should be efficient too). Compaction will =
copy the attachments over and should retain a single
copy for each unique attachment.

Attachments are identified by name and can be replaced without mutating =
old references to documents with attachments of
the same name. If you pass the _attachments section and leave out stubs =
for any existing attachments, that is interpreted as
a delete.

Brian.

> On Oct 1, 2014, at 3:53 PM, Eric B <ebenzacar@gmail.com> wrote:
>=20
> Given that attachments are seemingly stored as key/value pairs within =
a
> document, does that mean that each revision of a document contains the
> attachments as well?  Or are they stored independently?
>=20
> For instance, given a 5kb document with a 100Mb attachment that has 10 =
revs
> (where the attachment was added in rev 1), will the total storage
> requirements be 5kb * 10 + 100Mb or (5kb + 10Mb) * 10?
>=20
> Thanks,
>=20
> Eric