Mongodb 索引的使用

[linkbg]

在数据库中已经存在了一条索引：

{ "name" : "port_1", "key" : { "port" : 1 }, "host" : "loca:27017", "accesses" : { "ops" : NumberLong(1), "since" : ISODate("2017-05-11T15:27:25.749Z") } }

当我使用测试命令来：

db.base.find({"port":'80'}).explain()

结果是：

{
	"queryPlanner" : {
		"plannerVersion" : 1,
		"namespace" : "mooz.base",
		"indexFilterSet" : false,
		"parsedQuery" : {
			"port" : {
				"$eq" : "80"
			}
		},
		"winningPlan" : {
			"stage" : "FETCH",
			"inputStage" : {
				"stage" : "IXSCAN",
				"keyPattern" : {
					"port" : 1
				},
				"indexName" : "port_1",
				"isMultiKey" : false,
				"multiKeyPaths" : {
					"port" : [ ]
				},
				"isUnique" : false,
				"isSparse" : false,
				"isPartial" : false,
				"indexVersion" : 2,
				"direction" : "forward",
				"indexBounds" : {
					"port" : [
						"[\"80\", \"80\"]"
					]
				}
			}
		},
		"rejectedPlans" : [ ]
	},
	"serverInfo" : {
		"host" : "loca",
		"port" : 27017,
		"version" : "3.4.3",
		"gitVersion" : "f07437fb5a6cca07c10bafa78365456eb1d6d5e1"
	},
	"ok" : 1
}

为什么呢？是不是我打开的方式不对，求正确的解锁方式。谢谢

[billlee]

没有问题啊，先 IXSCAN port_1, 根据结果再 FETCH 整个文档

[linkbg]

@billlee 明白了。谢谢。