db.compound.find().sort(

{b:1}

).itcount()
3
> db.compound.find().sort(

{b:1}

)

{ "$err" : "too much key data for sort() with no index. add an index or specify a smaller limit", "code" : 10128 } { "$err" : "too much key data for sort() with no index. add an index or specify a smaller limit", "code" : 10128 } { "$err" : "too much key data for sort() with no index. add an index or specify a smaller limit", "code" : 10128 }