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I store a very long string to my document in mongodb server, my document looks like 

{
    "_id": ObjectId("5280efdbe4b062c93b582118"),
    "viewID": 1,
    "content": "a very long string"
}

and there are about hundreds of such documents in the same collection. I have indexed the collection.

The problem is that I just execute a very simple query 

db.blog.find({viewID:1});

and then get a very long time (over several hours) to wait for the response, and no any error message displayed, server status is OK. But I just add db.blog.find({viewID:1}).limit(1); mongodb returns the result at once.

How can I do to solve the problem or improve the performance??

Here is my explain:

db.blog.find({viewID:1}).explain();
{
    "cursor" : "BtreeCursor viewID_1",
    "isMultiKey" : false,
    "n" : 377,
    "nscannedObjects" : 377,
    "nscanned" : 377,
    "nscannedObjectsAllPlans" : 377,
    "nscannedAllPlans" : 377,
    "scanAndOrder" : false,
    "indexOnly" : false,
    "nYields" : 0,
    "nChunkSkips" : 0,
    "millis" : 45,
    "indexBounds" : {
        "viewID" : [
            [
                1,
                1
            ]
        ]
    },
    "server" : "Server:27017"
}

Here is colStat:

db.blog.stats();
{
    "ns" : "***.blog",
    "count" : 98582,
    "size" : 2330759632,
    "avgObjSize" : 23642.851960804204,
    "storageSize" : 2958364672,
    "numExtents" : 18,
    "nindexes" : 2,
    "lastExtentSize" : 778276864,
    "paddingFactor" : 1,
    "systemFlags" : 1,
    "userFlags" : 0,
    "totalIndexSize" : 6540800,
    "indexSizes" : {
        "_id_" : 4055296,
        "viewID_1" : 2485504
    },
    "ok" : 1
}
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