Get execution stats in MongoDB for a collection



To get stats, use explain() in MongoDB. Let us create a collection with documents −

> db.demo157.insertOne({"Status":"Active"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e354fdffdf09dd6d08539fc") } > db.demo157.insertOne({"Status":"InActive"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e354fe3fdf09dd6d08539fd") }

Display all documents from a collection with the help of find() method −

> db.demo157.find();

This will produce the following output −

{ "_id" : ObjectId("5e354fdffdf09dd6d08539fc"), "Status" : "Active" } { "_id" : ObjectId("5e354fe3fdf09dd6d08539fd"), "Status" : "InActive" }

Following is how to implement explain() in MongoDB −

> db.demo157.find({Status: { $in: ['Active','InActive'] }}).explain("executionStats");

This will produce the following output −

{    "queryPlanner" : {       "plannerVersion" : 1,       "namespace" : "test.demo157",       "indexFilterSet" : false,       "parsedQuery" : {          "Status" : {             "$in" : [                "Active",                "InActive"             ]          }       },       "winningPlan" : {          "stage" : "COLLSCAN",          "filter" : {             "Status" : {                "$in" : [                   "Active",                   "InActive"                ]             }          },          "direction" : "forward"       },       "rejectedPlans" : [ ]    },    "executionStats" : {       "executionSuccess" : true,       "nReturned" : 2,       "executionTimeMillis" : 18,       "totalKeysExamined" : 0,       "totalDocsExamined" : 2,       "executionStages" : {          "stage" : "COLLSCAN",          "filter" : {             "Status" : {                "$in" : [                   "Active",                   "InActive"                ]             }          },          "nReturned" : 2,          "executionTimeMillisEstimate" : 0,          "works" : 4,          "advanced" : 2,          "needTime" : 1,          "needYield" : 0,          "saveState" : 0,          "restoreState" : 0,          "isEOF" : 1,          "invalidates" : 0,          "direction" : "forward",          "docsExamined" : 2       }    },    "serverInfo" : {       "host" : "DESKTOP-QN2RB3H",       "port" : 27017,       "version" : "4.0.5",       "gitVersion"       "3739429dd92b92d1b0ab120911a23d50bf03c412"    },    "ok" : 1 }
Updated on: 2020-04-01T11:39:19+05:30

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