db - stats

{
    "db" : "imessage",
    "collections" : 3,
    "objects" : 162631451,
    "avgObjSize" : 375.329812232936,
    "dataSize" : 61040431967.0,
    "storageSize" : 23443738624.0,
    "numExtents" : 0,
    "indexes" : 5,
    "indexSize" : 3640287232.0,
    "ok" : 1.0
}