Storage of MongoDB PDF Files Taking double the expected time?

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A couple of months ago I launched a web application for a customer using mongodb for the first time. One of the collections can have documents that store a single .pdf file in binary format. The size of the .pdf file that gets stored in the document is always around 7mb.
To my surprise, the documents that do contain the .pdf files seem to be taking up double the space. As it stands the collection size is at 70gb with only 3900 documents containing the 7mb .pdf file. How can that be, please help?

posted Jan 6, 2017 by anonymous

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How to upload pdf files to MongoDB

I have searched the method and found that GridFS might help. I refer the tutorial as below:
http://api.mongodb.com/python/current/examples/gridfs.html

But there is one problem, I dont know how to insert the local address to the code. It means that I would like to specify the local address of a pdf file and upload it to the database, but I dont know how to do it.

I also try to add the address of file into "put()" as: