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Message from discussion size document in MongoDB!!!

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Date: Thu, 26 Jul 2012 21:01:59 -0700 (PDT)
From: "easy_010...@yahoo.com" <bthp...@gmail.com>
To: mongodb-user@googlegroups.com
Message-Id: <4322316c-b4e9-4926-9269-c7739d58dbbc@googlegroups.com>
Subject: size document in MongoDB!!!
MIME-Version: 1.0
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i use MongoDB 2.0.5
i have document with two format
First:
doc1={_id:{w1:"he thong",w2:"thong 
tin"},value:33}->Object.bsonsize(doc1)=65bytes
Second:
doc2={w1:"he thong",w2:"thong tin",value:33}->Object.bsonsize(doc2)=55bytes

When i insert doc1 and doc2 into sam collection
Then i run
Object.bsonsize(db.mycollection.find({"_id.w1":"he thong"})) => 48 bytes
Object.bsonsize(db.mycollection.find({"w1":"he thong"})) => 48 bytes
Why size of document before and after insert to collection is difference? 
and two documents with differ size (doc2<doc1) but they are same size after 
insert into collection?

Thanks alot!!!
Phuc
** 

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i use MongoDB 2.0.5<br>i have document with two format<br>First:<br><div style="margin-left: 40px;">doc1={_id:{w1:"he thong",w2:"thong tin"},value:33}-&gt;<!--[if gte mso 9]><xml>
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<![endif]-->Object.bsonsize(doc1)=65bytes<br></div>Second:<br><div style="margin-left: 40px;">doc2={w1:"he thong",w2:"thong tin",value:33}-&gt;Object.bsonsize(doc2)=55bytes<br><br>When i insert doc1 and doc2 into sam collection<br></div>Then i run<br><div style="margin-left: 40px;">Object.bsonsize(db.mycollection.find({"_id.w1":"he thong"})) =&gt; 48 bytes<br>Object.bsonsize(db.mycollection.find({"w1":"he thong"})) =&gt; 48 bytes<br></div>Why size of document before and after insert to collection is difference? and two documents with differ size (doc2&lt;doc1) but they are same size after insert into collection?<br><br>Thanks alot!!!<br>Phuc<br><div style="margin-left: 40px;"><b style="mso-bidi-font-weight:
normal"><span style="font-size:13.0pt;mso-bidi-font-size:11.0pt;line-height:
115%;color:red"></span></b>

</div>
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