mongo 查询分析 查看索引是有有效

1.执行  db.表名.find(条件).explain() 查看分析结果 类似ORACLE的Sql执行计划

db.MD5Data.find({$and:[
{code:"6512bd43d9caa6e02c990b0a82652dca"}
]}).explain()

看到： 

表示索引执行成功

返回数据详情：如下

{
    "queryPlanner": {
        "plannerVersion": NumberInt("1"),
        "namespace": "MD5.MD5Data",
        "indexFilterSet": false,
        "parsedQuery": {
            "code": {
                "$eq": "6512bd43d9caa6e02c990b0a82652dca"
            }
        },
        "queryHash": "184EA866",
        "planCacheKey": "5C679A65",
        "winningPlan": {
            "stage": "FETCH",
            "inputStage": {
                "stage": "IXSCAN",
                "keyPattern": {
                    "code": -1
                },
                "indexName": "code_-1",
                "isMultiKey": false,
                "multiKeyPaths": {
                    "code": [ ]
                },
                "isUnique": false,
                "isSparse": false,
                "isPartial": false,
                "indexVersion": NumberInt("2"),
                "direction": "forward",
                "indexBounds": {
                    "code": [
                        "["6512bd43d9caa6e02c990b0a82652dca", "6512bd43d9caa6e02c990b0a82652dca"]"
                    ]
                }
            }
        },
        "rejectedPlans": [ ]
    },
    "serverInfo": {
        "host": "DESKTOP-KFPQ8D5",
        "port": NumberInt("27017"),
        "version": "4.2.0",
        "gitVersion": "a4b751dcf51dd249c5865812b390cfd1c0129c30"
    },
    "ok": 1
}