mongos> db.find({ "user" : "jhon"}).sort({"name" :
1}).limit(100).explain()
{
"cursor" : "BtreeCursor user_1",
"nscanned" : 10100,
"nscannedObjects" : 10100,
"n" : 100,
"scanAndOrder" : true,
"millis" : 116,
"nYields" : 0,
"nChunkSkips" : 0,
"isMultiKey" : false,
"indexOnly" : false,
"indexBounds" : {
"user" : [
[
"jhon",
"jhon"
]
]
}
}
Second, I do $or query with sort():
mongos> db.find({ "$or" : [ { "user" : "jhon"} , { "owner" :
"jhon"}]}).sort({"name" : 1}).limit(100).explain()
{
"cursor" : "BtreeCursor name_1",
"nscanned" : 1010090,
"nscannedObjects" : 1010090,
"n" : 100,
"millis" : 3800,
"nYields" : 0,
"nChunkSkips" : 0,
"isMultiKey" : false,
"indexOnly" : false,
"indexBounds" : {
"name" : [
[
{
"$minElement" : 1
},
{
"$maxElement" : 1
}
]
]
}
}
Last, I do $or query without sort():
mongos> db.find({ "$or" : [ { "user" : "jhon"} , { "owner" :
"jhon"}]}).limit(100).explain()
{
"cursor" : "BtreeCursor user_1",
"nscanned" : 100,
"nscannedObjects" : 100,
"n" : 100,
"millis" : 0,
"nYields" : 0,
"nChunkSkips" : 0,
"isMultiKey" : false,
"indexOnly" : false,
"indexBounds" : {
"user" : [
[
"jhon",
"jhon"
]
]
}
}
|
