mongo索引加速查询

实验前：

func  TestInsert(g *gin.Context) {
  rsp := new(Rsp)

  var tests [] interface{}
  for i:=0; i<1000000 ;i++  {
    newuser := new(Test)

    newuser.Email =strconv.Itoa(i)
    newuser.Username =strconv.Itoa(i)
    newuser.Password = strconv.Itoa(i)
    newuser.Phone =strconv.Itoa(i)
    newuser.Address = strconv.Itoa(i)
    newuser.CreateTime= int32(time.Now().Unix())
    newuser.Height= int32(i)
    tests=append(tests,newuser)
  }

  mgo := db.InitMongoDB()
  insertID, err := mgo.Collection(db.Test).InsertMany(context.Background(), tests,nil)
  fmt.Println(insertID)
  if err == nil {
    rsp.Msg = "success"
    rsp.Code = 200
    g.JSON(http.StatusOK, rsp)
    return
  } else {
    rsp.Msg = "faild"
    rsp.Code = 201
    g.JSON(http.StatusOK, rsp)
    return
  }
}

db.getCollection('test').find({"height":500000})

需要时间 0.685sec

优化

添加索引：db.test.createIndex( {“height”:1})

查询：

db.getCollection('test').find({"height":500000})

需要时间 0.003sec

{
     "_id" : ObjectId("5cdbb0c60839769587c2b90c"),
     "username" : "500000",
     "password" : "500000",
     "address" : "500000",
     "gender" : 0,
     "email" : "500000",
     "phone" : "500000",
     "createtime" : 1557901500,
     "height" : 500000
 }