MongoDB学习之性能监控篇

mongodb可以通过profile来监控数据，进行优化，下列操作基于Studio 3T可视化工具，另外也可以通过自带的web管理界面进行操作或者是mongoDB自带的命令行工具mongostat。
1、查看当前mongoDB是否开启profile功能,

使用命令：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。通常没做过任何修改的默认是返回0，也就是关闭状态。

使用命令：db.setProfilingLevel(level);开启profile功能为,其中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，取决于你的需求自行调整。

通过上述设置后，我们先执行下面一条简单查询语句，因为之前的执行语句在没有开启profile功能时是查询不出监控日志的

db.getCollection("_mongoCase").find({_id:ObjectId("5c0c70747d9c6f0728933388")});

2、查看当前执行过的命令的监控日志

使用命令：db.system.profile.find() 查看当前所有的监控日志。当然我们也可以通过执行db.system.profile.find({millis:{$gt:500}})能够返回查询时间在500毫秒以上的查询命令。总之find里面的条件可以根据你当前的需要进行更改。

示例：执行命令 db.system.profile.find({millis:{$lt:1}});  返回监控日志如下：

{ 
    "op" : "query", //操作类型，有insert、query、update、remove、getmore、command  
    "ns" : "test._mongoCase", //命令空间，哪个库下的哪个集合
    "command" : { //执行的命令
        "find" : "_mongoCase", //目标对象集合
        "filter" : { //过滤条件
            "_id" : ObjectId("5c0c70747d9c6f0728933388")
        }, 
        "batchSize" : 33350.0,  
        "$db" : "test", //数据库
        "lsid" : {
            "id" : BinData(4, "XA2BHNiqTau9J278WRS3sA==")
        }, 
        "$readPreference" : {
            "mode" : "secondaryPreferred"
        }
    }, 
    "keysExamined" : 1.0, //索引扫描数量，这里用了_id,所以是1，如果没有用主键或索引这里会是0
    "docsExamined" : 1.0, //文档扫描数量
    "cursorExhausted" : true, 
    "numYield" : 0.0, //该操作为了使其他操作完成而放弃的次数。通常来说，当他们需要访问                                    还没有完全读入内存中的数据时，操作将放弃。这使得在MongoDB为了                                   放弃操作进行数据读取的同时，还有数据在内存中的其他操作可以完成。
    "nreturned" : 1.0, //返回的文档数量
    "locks" : {  //锁信息，R：全局读锁；W：全局写锁；r：特定数据库的读锁；w：特定数据库的写锁
        "Global" : {  //全局锁
            "acquireCount" : {
                "r" : NumberLong(1) //该操作获取一个全局级锁花费的时间
            }
        }, 
        "Database" : { //数据库锁
            "acquireCount" : {
                "r" : NumberLong(1)
            }
        }, 
        "Collection" : { //集合锁
            "acquireCount" : {
                "r" : NumberLong(1)
            }
        }
    }, 
    "responseLength" : 258.0, //返回结果字节长度
    "protocol" : "op_msg", 
    "millis" : 0.0, //消耗的时间（毫秒）
    "planSummary" : "IDHACK", //执行概览 从这里看来 是主键查询，COLLSCAN 为全文档扫描
    "execStats" : { //详细的执行计划 这里先略过 后续可以用 explain来具体分析
        "stage" : "IDHACK", 
        "nReturned" : 1.0, 
        "executionTimeMillisEstimate" : 0.0, 
        "works" : 2.0, 
        "advanced" : 1.0, 
        "needTime" : 0.0, 
        "needYield" : 0.0, 
        "saveState" : 0.0, 
        "restoreState" : 0.0, 
        "isEOF" : 1.0, 
        "invalidates" : 0.0, 
        "keysExamined" : 1.0, 
        "docsExamined" : 1.0
    }, 
    "ts" : ISODate("2018-12-16T03:56:54.206+0000"), //命令执行的时间
    "client" : "127.0.0.1",  //访问的主机
    "allUsers" : [

    ], 
    "user" : ""
}

慢查询的分析参考：

• 如果发现 millis 值比较大，那么就需要作优化。

• 如果docsExamined数很大，或者接近记录总数（文档数），那么可能没有用到索引查询，而是全表扫描。

• 如果keysExamined数为0，也可能是没用索引。

• 结合 planSummary 中的显示，上例中是 "IDHACK" 确认是针对主键查询，因为id是默认主键

• 如果 keysExamined 值高于 nreturned 的值，说明数据库为了找到目标文档扫描了很多文档。这时可以考虑创建索引来提高效率。

• 索引的键值选择可以根据 query 中的输出参考，

• 分析具体的执行计划，使用命令 db.getCollection("_mongoCase").find({_id:ObjectId("5c0c70747d9c6f0728933388")}).explain(); 这种操作类似于PL/SQL的F5。

3、查看某一个db的运行状态

使用命令 db.stats();能够查看当前数据库的运行情况

{ 
    "db" : "test", //库名
    "collections" : 2.0, //集合数
    "views" : 0.0, 
    "objects" : 17.0, //记录数
    "avgObjSize" : 336.5882352941176, //每条记录的平均值
    "dataSize" : 5722.0, //记录的总大小
    "storageSize" : 73728.0, //预分配的存储空间
    "numExtents" : 0.0, //事件数
    "indexes" : 1.0, //索引数
    "indexSize" : 16384.0,  //索引大小
    "fsUsedSize" : 18770034688.0, //文件使用大小
    "fsTotalSize" : 304943722496.0, //文件总大小
    "ok" : 1.0
}

4、查看mongoDB运行状态

使用命令 db.serverStatus();能够查询这个mongoDB的运行情况

{ 
    "host" : "DESKTOP-MFL4IGI", //主机名
    "version" : "4.0.4", //mongoDB版本号
    "process" : "E:\\MongoDB\\bin\\mongod.exe", //进程名
    "pid" : NumberLong(12292), //进程ID
    "uptime" : 7461.0, //运行时间
    "uptimeMillis" : NumberLong(7460411), 
    "uptimeEstimate" : NumberLong(7460), 
    "localTime" : ISODate("2018-12-16T04:44:07.149+0000"), //当前时间
    "asserts" : {
        "regular" : 0.0, 
        "warning" : 0.0, 
        "msg" : 0.0, 
        "user" : 24.0, 
        "rollovers" : 0.0
    }, 
    "connections" : {
        "current" : 4.0, 
        "available" : 999996.0, 
        "totalCreated" : 4.0
    }, 
    "extra_info" : {
        "note" : "fields vary by platform", 
        "page_faults" : 52261.0, 
        "usagePageFileMB" : 149.0, 
        "totalPageFileMB" : 8998.0, 
        "availPageFileMB" : 3423.0, 
        "ramMB" : 8102.0
    }, 
    "freeMonitoring" : {
        "state" : "undecided"
    }, 
    "globalLock" : {
        "totalTime" : NumberLong(7460400000), 
        "currentQueue" : {
            "total" : 0.0, 
            "readers" : 0.0, 
            "writers" : 0.0
        }, 
        "activeClients" : {
            "total" : 15.0, 
            "readers" : 0.0, 
            "writers" : 0.0
        }
    }, 
    "locks" : {
        "Global" : {
            "acquireCount" : {
                "r" : NumberLong(24997), 
                "w" : NumberLong(205), 
                "W" : NumberLong(5)
            }
        }, 
        "Database" : {
            "acquireCount" : {
                "r" : NumberLong(8635), 
                "w" : NumberLong(197), 
                "R" : NumberLong(10), 
                "W" : NumberLong(8)
            }, 
            "acquireWaitCount" : {
                "W" : NumberLong(1)
            }, 
            "timeAcquiringMicros" : {
                "W" : NumberLong(171)
            }
        }, 
        "Collection" : {
            "acquireCount" : {
                "r" : NumberLong(8544), 
                "w" : NumberLong(172)
            }
        }, 
        "Metadata" : {
            "acquireCount" : {
                "W" : NumberLong(9)
            }
        }
    }, 
    "logicalSessionRecordCache" : {
        "activeSessionsCount" : 1.0, 
        "sessionsCollectionJobCount" : 25.0, 
        "lastSessionsCollectionJobDurationMillis" : 0.0, 
        "lastSessionsCollectionJobTimestamp" : ISODate("2018-12-16T04:39:48.942+0000"), 
        "lastSessionsCollectionJobEntriesRefreshed" : 0.0, 
        "lastSessionsCollectionJobEntriesEnded" : 0.0, 
        "lastSessionsCollectionJobCursorsClosed" : 0.0, 
        "transactionReaperJobCount" : 0.0, 
        "lastTransactionReaperJobDurationMillis" : 0.0, 
        "lastTransactionReaperJobTimestamp" : ISODate("2018-12-16T02:39:48.935+0000"), 
        "lastTransactionReaperJobEntriesCleanedUp" : 0.0
    }, 
    "network" : {
        "bytesIn" : NumberLong(71202), 
        "bytesOut" : NumberLong(936059), 
        "physicalBytesIn" : NumberLong(71202), 
        "physicalBytesOut" : NumberLong(936059), 
        "numRequests" : NumberLong(1046), 
        "compression" : {
            "snappy" : {
                "compressor" : {
                    "bytesIn" : NumberLong(0), 
                    "bytesOut" : NumberLong(0)
                }, 
                "decompressor" : {
                    "bytesIn" : NumberLong(0), 
                    "bytesOut" : NumberLong(0)
                }
            }
        }, 
        "serviceExecutorTaskStats" : {
            "executor" : "passthrough", 
            "threadsRunning" : 4.0
        }
    }, 
    "opLatencies" : {
        "reads" : {
            "latency" : NumberLong(2549), 
            "ops" : NumberLong(19)
        }, 
        "writes" : {
            "latency" : NumberLong(0), 
            "ops" : NumberLong(0)
        }, 
        "commands" : {
            "latency" : NumberLong(116797), 
            "ops" : NumberLong(1026)
        }, 
        "transactions" : {
            "latency" : NumberLong(0), 
            "ops" : NumberLong(0)
        }
    }, 
    "opcounters" : {
        "insert" : 0.0, 
        "query" : 18.0, 
        "update" : 14.0, 
        "delete" : 0.0, 
        "getmore" : 2.0, 
        "command" : 1052.0
    }, 
    "opcountersRepl" : {
        "insert" : 0.0, 
        "query" : 0.0, 
        "update" : 0.0, 
        "delete" : 0.0, 
        "getmore" : 0.0, 
        "command" : 0.0
    }, 
    "storageEngine" : {
        "name" : "wiredTiger", 
        "supportsCommittedReads" : true, 
        "supportsSnapshotReadConcern" : true, 
        "readOnly" : false, 
        "persistent" : true
    }, 
    "tcmalloc" : {
        "generic" : {
            "current_allocated_bytes" : 61257776.0, 
            "heap_size" : 62259200.0
        }, 
        "tcmalloc" : {
            "pageheap_free_bytes" : 548864.0, 
            "pageheap_unmapped_bytes" : 0.0, 
            "max_total_thread_cache_bytes" : 1061158912.0, 
            "current_total_thread_cache_bytes" : 316520.0, 
            "total_free_bytes" : 452560.0, 
            "central_cache_free_bytes" : 136040.0, 
            "transfer_cache_free_bytes" : 0.0, 
            "thread_cache_free_bytes" : 316520.0, 
            "aggressive_memory_decommit" : 0.0, 
            "pageheap_committed_bytes" : 62259200.0, 
            "pageheap_scavenge_count" : 0.0, 
            "pageheap_commit_count" : 39.0, 
            "pageheap_total_commit_bytes" : 62259200.0, 
            "pageheap_decommit_count" : 0.0, 
            "pageheap_total_decommit_bytes" : 0.0, 
            "pageheap_reserve_count" : 39.0, 
            "pageheap_total_reserve_bytes" : 62259200.0, 
            "spinlock_total_delay_ns" : 0.0, 
            "formattedString" : "------------------------------------------------\nMALLOC:       61257776 (   58.4 MiB) Bytes in use by application\nMALLOC: +       548864 (    0.5 MiB) Bytes in page heap freelist\nMALLOC: +       136040 (    0.1 MiB) Bytes in central cache freelist\nMALLOC: +            0 (    0.0 MiB) Bytes in transfer cache freelist\nMALLOC: +       316520 (    0.3 MiB) Bytes in thread cache freelists\nMALLOC: +      6316248 (    6.0 MiB) Bytes in malloc metadata\nMALLOC:   ------------\nMALLOC: =     68575448 (   65.4 MiB) Actual memory used (physical + swap)\nMALLOC: +            0 (    0.0 MiB) Bytes released to OS (aka unmapped)\nMALLOC:   ------------\nMALLOC: =     68575448 (   65.4 MiB) Virtual address space used\nMALLOC:\nMALLOC:            307              Spans in use\nMALLOC:             13              Thread heaps in use\nMALLOC:           4096              Tcmalloc page size\n------------------------------------------------\nCall ReleaseFreeMemory() to release freelist memory to the OS (via madvise()).\nBytes released to the OS take up virtual address space but no physical memory.\n"
        }
    }, 
    "transactions" : {
        "retriedCommandsCount" : NumberLong(0), 
        "retriedStatementsCount" : NumberLong(0), 
        "transactionsCollectionWriteCount" : NumberLong(0), 
        "currentActive" : NumberLong(0), 
        "currentInactive" : NumberLong(0), 
        "currentOpen" : NumberLong(0), 
        "totalAborted" : NumberLong(0), 
        "totalCommitted" : NumberLong(0), 
        "totalStarted" : NumberLong(0)
    }, 
    "transportSecurity" : {
        "1.0" : NumberLong(0), 
        "1.1" : NumberLong(0), 
        "1.2" : NumberLong(0), 
        "1.3" : NumberLong(0), 
        "unknown" : NumberLong(0)
    }, 
    "wiredTiger" : {
        "uri" : "statistics:", 
        "LSM" : {
            "application work units currently queued" : 0.0, 
            "merge work units currently queued" : 0.0, 
            "rows merged in an LSM tree" : 0.0, 
            "sleep for LSM checkpoint throttle" : 0.0, 
            "sleep for LSM merge throttle" : 0.0, 
            "switch work units currently queued" : 0.0, 
            "tree maintenance operations discarded" : 0.0, 
            "tree maintenance operations executed" : 0.0, 
            "tree maintenance operations scheduled" : 0.0, 
            "tree queue hit maximum" : 0.0
        }, 
        "async" : {
            "current work queue length" : 0.0, 
            "maximum work queue length" : 0.0, 
            "number of allocation state races" : 0.0, 
            "number of flush calls" : 0.0, 
            "number of operation slots viewed for allocation" : 0.0, 
            "number of times operation allocation failed" : 0.0, 
            "number of times worker found no work" : 0.0, 
            "total allocations" : 0.0, 
            "total compact calls" : 0.0, 
            "total insert calls" : 0.0, 
            "total remove calls" : 0.0, 
            "total search calls" : 0.0, 
            "total update calls" : 0.0
        }, 
        "block-manager" : {
            "blocks pre-loaded" : 9.0, 
            "blocks read" : 109.0, 
            "blocks written" : 347.0, 
            "bytes read" : 458752.0, 
            "bytes written" : 1896448.0, 
            "bytes written for checkpoint" : 1896448.0, 
            "mapped blocks read" : 0.0, 
            "mapped bytes read" : 0.0
        }, 
        "cache" : {
            "application threads page read from disk to cache count" : 8.0, 
            "application threads page read from disk to cache time (usecs)" : 0.0, 
            "application threads page write from cache to disk count" : 170.0, 
            "application threads page write from cache to disk time (usecs)" : 25206.0, 
            "bytes belonging to page images in the cache" : 33496.0, 
            "bytes belonging to the cache overflow table in the cache" : 182.0, 
            "bytes currently in the cache" : 75961.0, 
            "bytes not belonging to page images in the cache" : 42465.0, 
            "bytes read into cache" : 31015.0, 
            "bytes written from cache" : 604762.0, 
            "cache overflow cursor application thread wait time (usecs)" : 0.0, 
            "cache overflow cursor internal thread wait time (usecs)" : 0.0, 
            "cache overflow score" : 0.0, 
            "cache overflow table entries" : 0.0, 
            "cache overflow table insert calls" : 0.0, 
            "cache overflow table remove calls" : 0.0, 
            "checkpoint blocked page eviction" : 0.0, 
            "eviction calls to get a page" : 397.0, 
            "eviction calls to get a page found queue empty" : 387.0, 
            "eviction calls to get a page found queue empty after locking" : 0.0, 
            "eviction currently operating in aggressive mode" : 0.0, 
            "eviction empty score" : 0.0, 
            "eviction passes of a file" : 0.0, 
            "eviction server candidate queue empty when topping up" : 0.0, 
            "eviction server candidate queue not empty when topping up" : 0.0, 
            "eviction server evicting pages" : 0.0, 
            "eviction server slept, because we did not make progress with eviction" : 186.0, 
            "eviction server unable to reach eviction goal" : 0.0, 
            "eviction state" : 32.0, 
            "eviction walk target pages histogram - 0-9" : 0.0, 
            "eviction walk target pages histogram - 10-31" : 0.0, 
            "eviction walk target pages histogram - 128 and higher" : 0.0, 
            "eviction walk target pages histogram - 32-63" : 0.0, 
            "eviction walk target pages histogram - 64-128" : 0.0, 
            "eviction walks abandoned" : 0.0, 
            "eviction walks gave up because they restarted their walk twice" : 0.0, 
            "eviction walks gave up because they saw too many pages and found no candidates" : 0.0, 
            "eviction walks gave up because they saw too many pages and found too few candidates" : 0.0, 
            "eviction walks reached end of tree" : 0.0, 
            "eviction walks started from root of tree" : 0.0, 
            "eviction walks started from saved location in tree" : 0.0, 
            "eviction worker thread active" : 4.0, 
            "eviction worker thread created" : 0.0, 
            "eviction worker thread evicting pages" : 1.0, 
            "eviction worker thread removed" : 0.0, 
            "eviction worker thread stable number" : 0.0, 
            "failed eviction of pages that exceeded the in-memory maximum count" : 0.0, 
            "failed eviction of pages that exceeded the in-memory maximum time (usecs)" : 0.0, 
            "files with active eviction walks" : 0.0, 
            "files with new eviction walks started" : 0.0, 
            "force re-tuning of eviction workers once in a while" : 0.0, 
            "hazard pointer blocked page eviction" : 0.0, 
            "hazard pointer check calls" : 1.0, 
            "hazard pointer check entries walked" : 0.0, 
            "hazard pointer maximum array length" : 0.0, 
            "in-memory page passed criteria to be split" : 0.0, 
            "in-memory page splits" : 0.0, 
            "internal pages evicted" : 0.0, 
            "internal pages split during eviction" : 0.0, 
            "leaf pages split during eviction" : 0.0, 
            "maximum bytes configured" : 3710910464.0, 
            "maximum page size at eviction" : 0.0, 
            "modified pages evicted" : 1.0, 
            "modified pages evicted by application threads" : 0.0, 
            "operations timed out waiting for space in cache" : 0.0, 
            "overflow pages read into cache" : 0.0, 
            "page split during eviction deepened the tree" : 0.0, 
            "page written requiring cache overflow records" : 0.0, 
            "pages currently held in the cache" : 27.0, 
            "pages evicted because they exceeded the in-memory maximum count" : 0.0, 
            "pages evicted because they exceeded the in-memory maximum time (usecs)" : 0.0, 
            "pages evicted because they had chains of deleted items count" : 0.0, 
            "pages evicted because they had chains of deleted items time (usecs)" : 0.0, 
            "pages evicted by application threads" : 0.0, 
            "pages queued for eviction" : 0.0, 
            "pages queued for urgent eviction" : 1.0, 
            "pages queued for urgent eviction during walk" : 0.0, 
            "pages read into cache" : 18.0, 
            "pages read into cache after truncate" : 5.0, 
            "pages read into cache after truncate in prepare state" : 0.0, 
            "pages read into cache requiring cache overflow entries" : 0.0, 
            "pages read into cache requiring cache overflow for checkpoint" : 0.0, 
            "pages read into cache skipping older cache overflow entries" : 0.0, 
            "pages read into cache with skipped cache overflow entries needed later" : 0.0, 
            "pages read into cache with skipped cache overflow entries needed later by checkpoint" : 0.0, 
            "pages requested from the cache" : 4467.0, 
            "pages seen by eviction walk" : 0.0, 
            "pages selected for eviction unable to be evicted" : 0.0, 
            "pages walked for eviction" : 0.0, 
            "pages written from cache" : 171.0, 
            "pages written requiring in-memory restoration" : 0.0, 
            "percentage overhead" : 8.0, 
            "tracked bytes belonging to internal pages in the cache" : 5048.0, 
            "tracked bytes belonging to leaf pages in the cache" : 70913.0, 
            "tracked dirty bytes in the cache" : 0.0, 
            "tracked dirty pages in the cache" : 0.0, 
            "unmodified pages evicted" : 0.0
        }, 
        "connection" : {
            "auto adjusting condition resets" : 619.0, 
            "auto adjusting condition wait calls" : 45852.0, 
            "detected system time went backwards" : 0.0, 
            "files currently open" : 17.0, 
            "memory allocations" : 169157.0, 
            "memory frees" : 167917.0, 
            "memory re-allocations" : 30618.0, 
            "pthread mutex condition wait calls" : 124424.0, 
            "pthread mutex shared lock read-lock calls" : 53467.0, 
            "pthread mutex shared lock write-lock calls" : 8169.0, 
            "total fsync I/Os" : 469.0, 
            "total read I/Os" : 1525.0, 
            "total write I/Os" : 594.0
        }, 
        "cursor" : {
            "cursor create calls" : 67.0, 
            "cursor insert calls" : 135.0, 
            "cursor modify calls" : 0.0, 
            "cursor next calls" : 234.0, 
            "cursor operation restarted" : 0.0, 
            "cursor prev calls" : 45.0, 
            "cursor remove calls" : 28.0, 
            "cursor reserve calls" : 0.0, 
            "cursor reset calls" : 4757.0, 
            "cursor search calls" : 2715.0, 
            "cursor search near calls" : 144.0, 
            "cursor sweep buckets" : 44754.0, 
            "cursor sweep cursors closed" : 0.0, 
            "cursor sweep cursors examined" : 1068.0, 
            "cursor sweeps" : 7459.0, 
            "cursor update calls" : 0.0, 
            "cursors cached on close" : 345.0, 
            "cursors reused from cache" : 325.0, 
            "truncate calls" : 0.0
        }, 
        "data-handle" : {
            "connection data handles currently active" : 26.0, 
            "connection sweep candidate became referenced" : 0.0, 
            "connection sweep dhandles closed" : 0.0, 
            "connection sweep dhandles removed from hash list" : 61.0, 
            "connection sweep time-of-death sets" : 390.0, 
            "connection sweeps" : 3724.0, 
            "session dhandles swept" : 0.0, 
            "session sweep attempts" : 67.0
        }, 
        "lock" : {
            "checkpoint lock acquisitions" : 136.0, 
            "checkpoint lock application thread wait time (usecs)" : 0.0, 
            "checkpoint lock internal thread wait time (usecs)" : 0.0, 
            "commit timestamp queue lock application thread time waiting (usecs)" : 0.0, 
            "commit timestamp queue lock internal thread time waiting (usecs)" : 0.0, 
            "commit timestamp queue read lock acquisitions" : 0.0, 
            "commit timestamp queue write lock acquisitions" : 0.0, 
            "dhandle lock application thread time waiting (usecs)" : 0.0, 
            "dhandle lock internal thread time waiting (usecs)" : 0.0, 
            "dhandle read lock acquisitions" : 30740.0, 
            "dhandle write lock acquisitions" : 149.0, 
            "metadata lock acquisitions" : 125.0, 
            "metadata lock application thread wait time (usecs)" : 0.0, 
            "metadata lock internal thread wait time (usecs)" : 0.0, 
            "read timestamp queue lock application thread time waiting (usecs)" : 0.0, 
            "read timestamp queue lock internal thread time waiting (usecs)" : 0.0, 
            "read timestamp queue read lock acquisitions" : 0.0, 
            "read timestamp queue write lock acquisitions" : 0.0, 
            "schema lock acquisitions" : 154.0, 
            "schema lock application thread wait time (usecs)" : 0.0, 
            "schema lock internal thread wait time (usecs)" : 0.0, 
            "table lock application thread time waiting for the table lock (usecs)" : 0.0, 
            "table lock internal thread time waiting for the table lock (usecs)" : 0.0, 
            "table read lock acquisitions" : 0.0, 
            "table write lock acquisitions" : 14.0, 
            "txn global lock application thread time waiting (usecs)" : 0.0, 
            "txn global lock internal thread time waiting (usecs)" : 0.0, 
            "txn global read lock acquisitions" : 458.0, 
            "txn global write lock acquisitions" : 409.0
        }, 
        "log" : {
            "busy returns attempting to switch slots" : 1.0, 
            "force archive time sleeping (usecs)" : 0.0, 
            "log bytes of payload data" : 46782.0, 
            "log bytes written" : 70912.0, 
            "log files manually zero-filled" : 0.0, 
            "log flush operations" : 74160.0, 
            "log force write operations" : 81811.0, 
            "log force write operations skipped" : 81650.0, 
            "log records compressed" : 45.0, 
            "log records not compressed" : 19.0, 
            "log records too small to compress" : 195.0, 
            "log release advances write LSN" : 47.0, 
            "log scan operations" : 6.0, 
            "log scan records requiring two reads" : 0.0, 
            "log server thread advances write LSN" : 161.0, 
            "log server thread write LSN walk skipped" : 8133.0, 
            "log sync operations" : 208.0, 
            "log sync time duration (usecs)" : 4215507.0, 
            "log sync_dir operations" : 1.0, 
            "log sync_dir time duration (usecs)" : 0.0, 
            "log write operations" : 259.0, 
            "logging bytes consolidated" : 70400.0, 
            "maximum log file size" : 104857600.0, 
            "number of pre-allocated log files to create" : 2.0, 
            "pre-allocated log files not ready and missed" : 1.0, 
            "pre-allocated log files prepared" : 2.0, 
            "pre-allocated log files used" : 0.0, 
            "records processed by log scan" : 13.0, 
            "slot close lost race" : 0.0, 
            "slot close unbuffered waits" : 0.0, 
            "slot closures" : 208.0, 
            "slot join atomic update races" : 0.0, 
            "slot join calls atomic updates raced" : 0.0, 
            "slot join calls did not yield" : 259.0, 
            "slot join calls found active slot closed" : 0.0, 
            "slot join calls slept" : 0.0, 
            "slot join calls yielded" : 0.0, 
            "slot join found active slot closed" : 0.0, 
            "slot joins yield time (usecs)" : 0.0, 
            "slot transitions unable to find free slot" : 0.0, 
            "slot unbuffered writes" : 0.0, 
            "total in-memory size of compressed records" : 70943.0, 
            "total log buffer size" : 33554432.0, 
            "total size of compressed records" : 37500.0, 
            "written slots coalesced" : 0.0, 
            "yields waiting for previous log file close" : 0.0
        }, 
        "perf" : {
            "file system read latency histogram (bucket 1) - 10-49ms" : 2.0, 
            "file system read latency histogram (bucket 2) - 50-99ms" : 0.0, 
            "file system read latency histogram (bucket 3) - 100-249ms" : 0.0, 
            "file system read latency histogram (bucket 4) - 250-499ms" : 0.0, 
            "file system read latency histogram (bucket 5) - 500-999ms" : 0.0, 
            "file system read latency histogram (bucket 6) - 1000ms+" : 0.0, 
            "file system write latency histogram (bucket 1) - 10-49ms" : 1.0, 
            "file system write latency histogram (bucket 2) - 50-99ms" : 0.0, 
            "file system write latency histogram (bucket 3) - 100-249ms" : 0.0, 
            "file system write latency histogram (bucket 4) - 250-499ms" : 0.0, 
            "file system write latency histogram (bucket 5) - 500-999ms" : 0.0, 
            "file system write latency histogram (bucket 6) - 1000ms+" : 0.0, 
            "operation read latency histogram (bucket 1) - 100-249us" : 0.0, 
            "operation read latency histogram (bucket 2) - 250-499us" : 0.0, 
            "operation read latency histogram (bucket 3) - 500-999us" : 2.0, 
            "operation read latency histogram (bucket 4) - 1000-9999us" : 0.0, 
            "operation read latency histogram (bucket 5) - 10000us+" : 0.0, 
            "operation write latency histogram (bucket 1) - 100-249us" : 0.0, 
            "operation write latency histogram (bucket 2) - 250-499us" : 0.0, 
            "operation write latency histogram (bucket 3) - 500-999us" : 0.0, 
            "operation write latency histogram (bucket 4) - 1000-9999us" : 0.0, 
            "operation write latency histogram (bucket 5) - 10000us+" : 0.0
        }, 
        "reconciliation" : {
            "fast-path pages deleted" : 0.0, 
            "page reconciliation calls" : 181.0, 
            "page reconciliation calls for eviction" : 1.0, 
            "pages deleted" : 10.0, 
            "split bytes currently awaiting free" : 0.0, 
            "split objects currently awaiting free" : 0.0
        }, 
        "session" : {
            "open cursor count" : 22.0, 
            "open session count" : 19.0, 
            "session query timestamp calls" : 0.0, 
            "table alter failed calls" : 0.0, 
            "table alter successful calls" : 11.0, 
            "table alter unchanged and skipped" : 33.0, 
            "table compact failed calls" : 0.0, 
            "table compact successful calls" : 0.0, 
            "table create failed calls" : 0.0, 
            "table create successful calls" : 2.0, 
            "table drop failed calls" : 0.0, 
            "table drop successful calls" : 0.0, 
            "table rebalance failed calls" : 0.0, 
            "table rebalance successful calls" : 0.0, 
            "table rename failed calls" : 0.0, 
            "table rename successful calls" : 0.0, 
            "table salvage failed calls" : 0.0, 
            "table salvage successful calls" : 0.0, 
            "table truncate failed calls" : 0.0, 
            "table truncate successful calls" : 0.0, 
            "table verify failed calls" : 0.0, 
            "table verify successful calls" : 0.0
        }, 
        "thread-state" : {
            "active filesystem fsync calls" : 0.0, 
            "active filesystem read calls" : 0.0, 
            "active filesystem write calls" : 0.0
        }, 
        "thread-yield" : {
            "application thread time evicting (usecs)" : 0.0, 
            "application thread time waiting for cache (usecs)" : 0.0, 
            "connection close blocked waiting for transaction state stabilization" : 0.0, 
            "connection close yielded for lsm manager shutdown" : 0.0, 
            "data handle lock yielded" : 0.0, 
            "get reference for page index and slot time sleeping (usecs)" : 0.0, 
            "log server sync yielded for log write" : 0.0, 
            "page access yielded due to prepare state change" : 0.0, 
            "page acquire busy blocked" : 0.0, 
            "page acquire eviction blocked" : 0.0, 
            "page acquire locked blocked" : 0.0, 
            "page acquire read blocked" : 0.0, 
            "page acquire time sleeping (usecs)" : 0.0, 
            "page delete rollback time sleeping for state change (usecs)" : 0.0, 
            "page reconciliation yielded due to child modification" : 0.0
        }, 
        "transaction" : {
            "Number of prepared updates" : 0.0, 
            "Number of prepared updates added to cache overflow" : 0.0, 
            "Number of prepared updates resolved" : 0.0, 
            "commit timestamp queue entries walked" : 0.0, 
            "commit timestamp queue insert to empty" : 0.0, 
            "commit timestamp queue inserts to head" : 0.0, 
            "commit timestamp queue inserts total" : 0.0, 
            "commit timestamp queue length" : 0.0, 
            "number of named snapshots created" : 0.0, 
            "number of named snapshots dropped" : 0.0, 
            "prepared transactions" : 0.0, 
            "prepared transactions committed" : 0.0, 
            "prepared transactions currently active" : 0.0, 
            "prepared transactions rolled back" : 0.0, 
            "query timestamp calls" : 1.0, 
            "read timestamp queue entries walked" : 0.0, 
            "read timestamp queue insert to empty" : 0.0, 
            "read timestamp queue inserts to head" : 0.0, 
            "read timestamp queue inserts total" : 0.0, 
            "read timestamp queue length" : 0.0, 
            "rollback to stable calls" : 0.0, 
            "rollback to stable updates aborted" : 0.0, 
            "rollback to stable updates removed from cache overflow" : 0.0, 
            "set timestamp calls" : 0.0, 
            "set timestamp commit calls" : 0.0, 
            "set timestamp commit updates" : 0.0, 
            "set timestamp oldest calls" : 0.0, 
            "set timestamp oldest updates" : 0.0, 
            "set timestamp stable calls" : 0.0, 
            "set timestamp stable updates" : 0.0, 
            "transaction begins" : 401.0, 
            "transaction checkpoint currently running" : 0.0, 
            "transaction checkpoint generation" : 126.0, 
            "transaction checkpoint max time (msecs)" : 191.0, 
            "transaction checkpoint min time (msecs)" : 1.0, 
            "transaction checkpoint most recent time (msecs)" : 2.0, 
            "transaction checkpoint scrub dirty target" : 0.0, 
            "transaction checkpoint scrub time (msecs)" : 0.0, 
            "transaction checkpoint total time (msecs)" : 4689.0, 
            "transaction checkpoints" : 125.0, 
            "transaction checkpoints skipped because database was clean" : 0.0, 
            "transaction failures due to cache overflow" : 0.0, 
            "transaction fsync calls for checkpoint after allocating the transaction ID" : 125.0, 
            "transaction fsync duration for checkpoint after allocating the transaction ID (usecs)" : 0.0, 
            "transaction range of IDs currently pinned" : 0.0, 
            "transaction range of IDs currently pinned by a checkpoint" : 0.0, 
            "transaction range of IDs currently pinned by named snapshots" : 0.0, 
            "transaction range of timestamps currently pinned" : 0.0, 
            "transaction range of timestamps pinned by a checkpoint" : 0.0, 
            "transaction range of timestamps pinned by the oldest timestamp" : 0.0, 
            "transaction sync calls" : 0.0, 
            "transactions committed" : 50.0, 
            "transactions rolled back" : 351.0, 
            "update conflicts" : 0.0
        }, 
        "concurrentTransactions" : {
            "write" : {
                "out" : 0.0, 
                "available" : 128.0, 
                "totalTickets" : 128.0
            }, 
            "read" : {
                "out" : 1.0, 
                "available" : 127.0, 
                "totalTickets" : 128.0
            }
        }
    }, 
    "mem" : {
        "bits" : 64.0, 
        "resident" : 80.0, 
        "virtual" : 5056.0, 
        "supported" : true, 
        "mapped" : 0.0, 
        "mappedWithJournal" : 0.0
    }, 
    "metrics" : {
        "commands" : {
            "buildInfo" : {
                "failed" : NumberLong(0), 
                "total" : NumberLong(5)
            }, 
            "collStats" : {
                "failed" : NumberLong(2), 
                "total" : NumberLong(3)
            }, 
            "connectionStatus" : {
                "failed" : NumberLong(0), 
                "total" : NumberLong(22)
            }, 
            "createIndexes" : {
                "failed" : NumberLong(0), 
                "total" : NumberLong(25)
            }, 
            "dbStats" : {
                "failed" : NumberLong(0), 
                "total" : NumberLong(4)
            }, 
            "find" : {
                "failed" : NumberLong(0), 
                "total" : NumberLong(18)
            }, 
            "getLastError" : {
                "failed" : NumberLong(0), 
                "total" : NumberLong(3)
            }, 
            "getMore" : {
                "failed" : NumberLong(0), 
                "total" : NumberLong(2)
            }, 
            "isMaster" : {
                "failed" : NumberLong(0), 
                "total" : NumberLong(900)
            }, 
            "listCollections" : {
                "failed" : NumberLong(0), 
                "total" : NumberLong(19)
            }, 
            "listDatabases" : {
                "failed" : NumberLong(0), 
                "total" : NumberLong(19)
            }, 
            "listIndexes" : {
                "failed" : NumberLong(0), 
                "total" : NumberLong(1)
            }, 
            "profile" : {
                "failed" : NumberLong(0), 
                "total" : NumberLong(3)
            }, 
            "replSetGetStatus" : {
                "failed" : NumberLong(24), 
                "total" : NumberLong(24)
            }, 
            "serverStatus" : {
                "failed" : NumberLong(0), 
                "total" : NumberLong(23)
            }, 
            "update" : {
                "failed" : NumberLong(0), 
                "total" : NumberLong(8)
            }, 
            "whatsmyuri" : {
                "failed" : NumberLong(0), 
                "total" : NumberLong(1)
            }
        }, 
        "cursor" : {
            "timedOut" : NumberLong(0), 
            "open" : {
                "noTimeout" : NumberLong(0), 
                "pinned" : NumberLong(0), 
                "total" : NumberLong(0)
            }
        }, 
        "document" : {
            "deleted" : NumberLong(0), 
            "inserted" : NumberLong(0), 
            "returned" : NumberLong(38), 
            "updated" : NumberLong(6)
        }, 
        "getLastError" : {
            "wtime" : {
                "num" : 0.0, 
                "totalMillis" : 0.0
            }, 
            "wtimeouts" : NumberLong(0)
        }, 
        "operation" : {
            "scanAndOrder" : NumberLong(0), 
            "writeConflicts" : NumberLong(0)
        }, 
        "queryExecutor" : {
            "scanned" : NumberLong(9), 
            "scannedObjects" : NumberLong(66)
        }, 
        "record" : {
            "moves" : NumberLong(0)
        }, 
        "repl" : {
            "executor" : {
                "pool" : {
                    "inProgressCount" : 0.0
                }, 
                "queues" : {
                    "networkInProgress" : 0.0, 
                    "sleepers" : 0.0
                }, 
                "unsignaledEvents" : 0.0, 
                "shuttingDown" : false, 
                "networkInterface" : "DEPRECATED: getDiagnosticString is deprecated in NetworkInterfaceTL"
            }, 
            "apply" : {
                "attemptsToBecomeSecondary" : NumberLong(0), 
                "batches" : {
                    "num" : 0.0, 
                    "totalMillis" : 0.0
                }, 
                "ops" : NumberLong(0)
            }, 
            "buffer" : {
                "count" : NumberLong(0), 
                "maxSizeBytes" : NumberLong(0), 
                "sizeBytes" : NumberLong(0)
            }, 
            "initialSync" : {
                "completed" : NumberLong(0), 
                "failedAttempts" : NumberLong(0), 
                "failures" : NumberLong(0)
            }, 
            "network" : {
                "bytes" : NumberLong(0), 
                "getmores" : {
                    "num" : 0.0, 
                    "totalMillis" : 0.0
                }, 
                "ops" : NumberLong(0), 
                "readersCreated" : NumberLong(0)
            }, 
            "preload" : {
                "docs" : {
                    "num" : 0.0, 
                    "totalMillis" : 0.0
                }, 
                "indexes" : {
                    "num" : 0.0, 
                    "totalMillis" : 0.0
                }
            }
        }, 
        "storage" : {
            "freelist" : {
                "search" : {
                    "bucketExhausted" : NumberLong(0), 
                    "requests" : NumberLong(0), 
                    "scanned" : NumberLong(0)
                }
            }
        }, 
        "ttl" : {
            "deletedDocuments" : NumberLong(7), 
            "passes" : NumberLong(124)
        }
    }, 
    "ok" : 1.0
}