GridFS Index
The unique and compound index used by GridFS on chunks
collection for the files _id and n fields. _id field contains the _id of the
chunk's "parent" document and the n filed contains the sequence
number of the chunk, It starts with 0 for descriptions of the documents and
fields in the chunks collection.
See following example:
cursor = db.fs.chunks.find({files_id:
myFileID}).sort({n:1});
GridFS index allows efficient retrieval of chunks using fields _id and n values.
Note: If your driver does not create this index, to fix this use
the following operation
db.fs.chunks.createIndex( { files_id: 1, n: 1 }, { unique:
true } );
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