Sorting by descending population
db.cities.find( { population: { $gte: 2000000 }, dem: { $gte : 1654 } } )
.sort( { population: -1 } ).explain();
{
"cursor" : "BtreeCursor population_1_dem_1 *reverse*",
"nscanned" : 127,
"nscannedObjects" : 6,
"n" : 6,
"millis" : 1,
"nYields" : 0,
"nChunkSkips" : 0,
"isMultiKey" : false,
"indexOnly" : false,
"indexBounds" : {
"population" : [ [ 1.7976931348623157e+308, 2000000 ] ],
"dem" : [ [ 1.7976931348623157e+308, 1654 ] ]
}
}
{ "name" : "Mexico City", "population" : 12294193, "dem" : 2240 }
{ "name" : "Bogotá", "population" : 7102602, "dem" : 2582 }
{ "name" : "Kabul", "population" : 3043532, "dem" : 1798 }
{ "name" : "Addis Ababa", "population" : 2757729, "dem" : 2405 }
{ "name" : "Nairobi", "population" : 2750547, "dem" : 1684 }
{ "name" : "Johannesburg", "population" : 2026469, "dem" : 1767 }