mongodb通过profile来监控数据

mongodb可以通过profile来监控数据，进行优化。
查看当前是否开启profile功能
用命令db.getProfilingLevel() 返回level等级，值为0|1|2，分别代表意思：0代表关闭，1代表记录慢命令，2代表全部
开启profile功能命令为

db.setProfilingLevel(level); #level等级，值同上

level为1的时候，慢命令默认值为100ms，

更改为db.setProfilingLevel(level,slowms)如db.setProfilingLevel(1,50)这样就更改为50毫秒

通过db.system.profile.find() 查看当前的监控日志.

/* 1 */
{
    "op" : "query",
    "ns" : "config.system.profile",
    "command" : {
        "find" : "system.profile",
        "filter" : {},
        "$readPreference" : {
            "mode" : "secondaryPreferred"
        },
        "$db" : "config"
    },
    "keysExamined" : 0,
    "docsExamined" : 0,
    "cursorExhausted" : true,
    "numYield" : 0,
    "locks" : {
        "Global" : {
            "acquireCount" : {
                "r" : NumberLong(2)
            }
        },
        "Database" : {
            "acquireCount" : {
                "r" : NumberLong(1)
            }
        },
        "Collection" : {
            "acquireCount" : {
                "r" : NumberLong(1)
            }
        }
    },
    "nreturned" : 0,
    "responseLength" : 94,
    "protocol" : "op_command",
    "millis" : 32,
    "planSummary" : "COLLSCAN",
    "execStats" : {
        "stage" : "COLLSCAN",
        "nReturned" : 0,
        "executionTimeMillisEstimate" : 0,
        "works" : 2,
        "advanced" : 0,
        "needTime" : 1,
        "needYield" : 0,
        "saveState" : 0,
        "restoreState" : 0,
        "isEOF" : 1,
        "invalidates" : 0,
        "direction" : "forward",
        "docsExamined" : 0
    },
    "ts" : ISODate("2019-01-18T03:10:06.731Z"),
    "client" : "192.168.0.72",
    "appName" : "MongoDB Shell",
    "allUsers" : [ 
        {
            "user" : "root",
            "db" : "admin"
        }
    ],
    "user" : "root@admin"
}