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From Paul Davis <>
Subject Re: chunked response and couch_doc_open
Date Fri, 23 Oct 2009 17:33:28 GMT
On Fri, Oct 23, 2009 at 1:27 PM, Norman Barker <> wrote:
> Hi,
> is there a way (in Erlang) to open a couchdb document and to iterate
> over the document body without having to open up all of the document
> in memory?
> I would like to use a chunked response to keep the system having a low
> memory overhead.
> Not a particular couch question, is there a method in erlang to find
> the size (as in number of bytes) of a particular term?
> many thanks,
> Norman


Well, for document JSON we store Erlang term binaries on disk so
there's no real way to stream a doc across the wire from disk without
loading the whole thing into RAM. Have you noticed CouchDB having
memory issues on read loads? Its generally pretty light on its memory
requirements for reads.

The only way to get the size of a Term in bytes that I know of is the
brute force: size(term_to_binary(Term)) method.

Paul Davis

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