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From Gabor Ratky <>
Subject Re: get size of a document (with attachments) within a view function ...
Date Wed, 03 Aug 2011 11:38:31 GMT

the sizes (length) of the attachments are available under doc._attachments. So the size of
the first attachment is doc._attachments['name_of_attachment.txt'].length. You can iterate
over this object easily and sum up the sizes. You can also:

map: '''
emit(doc._id, JSON.stringify(doc).length)
for attachment_name in attachments
emit(doc._id, attachments[attachment_name].length)

reduce: '_sum'

and let CouchDB reduce to the sum of sizes.


On Wednesday, August 3, 2011 at 1:34 PM, Hans-Dieter Böhlau wrote:

> Hi *,
> I'd like to calculate the size of a number of documents within a view ... to
> estimate the download-volume for the replication to client side.
> My idea is to calculate the size of each document within the map function
> and to sum up the values within the reduce step.
> How can I calculate the size of a document (including attachments!) within
> the map function?
> Thank you for help,
> Hans

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