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  • mongodb的状态分析

    1.借助工具 mongostat 分析mongodb运行状况
    C:UsersAdministrator>mongostat --help //查看帮助
    View live MongoDB performance statistics.
    
    usage: mongostat [options] [sleep time]
    sleep time: time to wait (in seconds) between calls
    Options:
      --help                                produce help message
      -v [ --verbose ]                      be more verbose (include multiple times
                                            for more verbosity e.g. -vvvvv)
      --quiet                               silence all non error diagnostic
                                            messages
      --version                             print the program's version and exit
      -h [ --host ] arg                     mongo host to connect to ( <set
                                            name>/s1,s2 for sets)
      --port arg                            server port. Can also use --host
                                            hostname:port
      --ipv6                                enable IPv6 support (disabled by
                                            default)
      -u [ --username ] arg                 username
      -p [ --password ] arg                 password
      --authenticationDatabase arg          user source (defaults to dbname)
      --authenticationMechanism arg (=MONGODB-CR)
                                            authentication mechanism
      --gssapiServiceName arg (=mongodb)    Service name to use when authenticating
                                            using GSSAPI/Kerberos
      --gssapiHostName arg                  Remote host name to use for purpose of
                                            GSSAPI/Kerberos authentication
      --noheaders                           don't output column names
      -n [ --rowcount ] arg (=0)            number of stats lines to print (0 for
                                            indefinite)
      --http                                use http instead of raw db connection
      --discover                            discover nodes and display stats for
                                            all
      --all                                 all optional fields
    
     Fields
       inserts      - # of inserts per second (* means replicated op)
       query        - # of queries per second
       update       - # of updates per second
       delete       - # of deletes per second
       getmore      - # of get mores (cursor batch) per second
       command      - # of commands per second, on a slave its local|replicated
       flushes      - # of fsync flushes per second
       mapped       - amount of data mmaped (total data size) megabytes
       vsize        - virtual size of process in megabytes
       res          - resident size of process in megabytes
       non-mapped   - amount virtual memeory less mapped memory (only with --all)
       faults       - # of pages faults per sec
       locked       - name of and percent time for most locked database
       idx miss     - percent of btree page misses (sampled)
       qr|qw        - queue lengths for clients waiting (read|write)
       ar|aw        - active clients (read|write)
       netIn        - network traffic in - bytes
       netOut       - network traffic out - bytes
       conn         - number of open connections
       set          - replica set name
       repl         - replication type
                        PRI - primary (master)
                        SEC - secondary
                        REC - recovering
                        UNK - unknown
                        SLV - slave
                  b     RTR - mongos process ("router")
    
    C:UsersAdministrator>mongostat 
    connected to: 127.0.0.1
    insert  query update delete getmore command flushes mapped  vsize    res faults  locked db idx miss %     qr|qw   ar|aw  netIn netOut  conn       time
        *0     *0     *0     *0       0     1|0       0   160m   446m    40m      0  test:0.0%          0       0|0     0|0    62b     3k     2   13:54:19

    2.mongodb慢操作日志 profile

    > db.getProfilingLevel() //查看慢日志记录级别 0=关闭 1=所有超过slowms的操作 2=记录所有查找
    0
    > db.setProfilingLevel(2){ "was" : 0, "slowms" : 100, "ok" : 1 } //设置日志记录级别2
    > show tablessystem.profile //这个就是日志集合
    > db.system.profile.find().sort({$natural:-1}).limit(1) //自然排序 倒序查看一条日志记录
    {
        "op": "query",
        "ns": "test.system.namespaces",
        "query": {
            
        },
        "ntoreturn": 0,
        "ntoskip": 0,
        "nscanned": 11,
        "nscannedObjects": 11,
        "keyUpdates": 0,
        "numYield": 0,
        "lockStats": {
            "timeLockedMicros": {
                "r": NumberLong(177),
                "w": NumberLong(0)
            },
            "timeAcquiringMicros": {
                "r": NumberLong(4),
                "w": NumberLong(4)
            }
        },
        "nreturned": 11,
        "responseLength": 449,
        "millis": 0,
        "execStats": {
            "type": "COLLSCAN",
            "works": 13,
            "yields": 0,
            "unyields": 0,
            "invalidates": 0,
            "advanced": 11,
            "needTime": 1,
            "needFetch": 0,
            "isEOF": 1,
            "docsTested": 11,
            "children": [
                
            ]
        },
        "ts": ISODate("2015-09-16T06:14:39.604Z"),
        "client": "127.0.0.1",
        "allUsers": [
            
        ],
        "user": ""
    }
    3.explain 方法显示查询语句的详细信息
    > db.system.local.find().explain()
    {
            "cursor" : "BasicCursor",
            "isMultiKey" : false,
            "n" : 0,
            "nscannedObjects" : 0,
            "nscanned" : 0,
            "nscannedObjectsAllPlans" : 0,
            "nscannedAllPlans" : 0,
            "scanAndOrder" : false,
            "indexOnly" : false,
            "nYields" : 0,
            "nChunkSkips" : 0,
            "millis" : 0,
            "server" : "buexplain:27017"
    }
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  • 原文地址:https://www.cnblogs.com/buexplain/p/4813253.html
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