bson compression rate

[Baruch Sadogursky]

Hi, all!

I have a question on the subj. While I understand BSON can't be just
BLOB, because MongoDB needs to get into it in cheap way, still the
numbers seem a little odd to me: my JSON string is about 80K and
Object.bsonsize() returns ~28.5K, which gives less than 1:3
compression rate.
Are those making sense or am I doing something wrong?

Thanks a lot!
Baruch.

[Geir Magnusson Jr.]

Just curious - why would you expect a higher ratio?

The BSON doc contains all the key strings, so there's no reduction in size there, and you're going to 'swap' all the JSON 'structural' data ({,:[]"}) for BSONs structural data (type information, size information....)

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[Baruch Sadogursky]

Yeah, probably you are right. For some reason I was under
misconception that text-to-binary provides higher compression rate.

[Michael Dirolf]

You also might want to check out the first FAQ, here:
http://bsonspec.org/#/faq

[Baruch Sadogursky]

Thanks for the link. That explains it.

On Jul 11, 6:08 pm, Michael Dirolf <m...@10gen.com> wrote:
> You also might want to check out the first FAQ, here:http://bsonspec.org/#/faq
>
> On Sun, Jul 11, 2010 at 11:04 AM, Baruch Sadogursky
>