mongodb: how can I see the execution time for the aggregate command?

Question

I execute the follow mongodb command in mongo shell

db.coll.aggregate(...)

and i see the list of result. but is it possible to see the quer

Answer 1

Try .explain("executionStats"):

db.inventory.find(
   { quantity: { $gte: 100, $lte: 200 } }
).explain("executionStats")

Which returns a very detailed JSON with the time in "executionTimeMillis" like:

{
   "queryPlanner" : {
         ...
   },
   "executionStats" : {
      "executionSuccess" : true,
      "nReturned" : 3,
      "executionTimeMillis" : 0,
      ...

More details: https://docs.mongodb.com/manual/tutorial/analyze-query-plan/#evaluate-the-performance-of-a-query