mongodb查看当前的存储引擎

[code] ./mongo -port 27001
MongoDB shell version v3.4.4
connecting to: mongodb://127.0.0.1:27001/
MongoDB server version: 3.4.4
shard1:ARBITER> use admin
switched to db admin
shard1:ARBITER> db.serverStatus()
{
"host" : "dzswj_mongodb_db3:27001",
"version" : "3.4.4",
"process" : "mongod",
"pid" : NumberLong(8708),
"uptime" : 28954736,
"uptimeMillis" : NumberLong("28954736154"),
"uptimeEstimate" : NumberLong(28954736),
"localTime" : ISODate("2019-01-07T06:09:36.622Z"),
"asserts" : {
"regular" : 0,
"warning" : 0,
"msg" : 0,
"user" : 3,
"rollovers" : 0
},
"connections" : {
"current" : 3,
"available" : 816,
"totalCreated" : 39
},
"extra_info" : {
"note" : "fields vary by platform",
"page_faults" : 0
},
"globalLock" : {
"totalTime" : NumberLong("28954736152000"),
"currentQueue" : {
"total" : 0,
"readers" : 0,
"writers" : 0
},
"activeClients" : {
"total" : 13,
"readers" : 0,
"writers" : 0
}
},
"locks" : {
"Global" : {
"acquireCount" : {
"r" : NumberLong(101338161),
"w" : NumberLong(16),
"W" : NumberLong(4)
}
},
"Database" : {
"acquireCount" : {
"r" : NumberLong(65146419),
"R" : NumberLong(1),
"W" : NumberLong(16)
}
},
"Collection" : {
"acquireCount" : {
"r" : NumberLong(36191719)
}
},
"Metadata" : {
"acquireCount" : {
"w" : NumberLong(1)
}
},
"oplog" : {
"acquireCount" : {
"r" : NumberLong(28954700)
}
}
},
"network" : {
"bytesIn" : NumberLong("4676480292"),
"bytesOut" : NumberLong("11604564500"),
"physicalBytesIn" : NumberLong("4676480292"),
"physicalBytesOut" : NumberLong("11604564500"),
"numRequests" : NumberLong(57734301)
},
"opLatencies" : {
"reads" : {
"latency" : NumberLong(0),
"ops" : NumberLong(0)
},
"writes" : {
"latency" : NumberLong(0),
"ops" : NumberLong(0)
},
"commands" : {
"latency" : NumberLong(1266325607),
"ops" : NumberLong(28867150)
}
},
"opcounters" : {
"insert" : 0,
"query" : 1,
"update" : 0,
"delete" : 0,
"getmore" : 0,
"command" : 28867150
},
"opcountersRepl" : {
"insert" : 0,
"query" : 0,
"update" : 0,
"delete" : 0,
"getmore" : 0,
"command" : 0
},
"repl" : {
"hosts" : [
"92.12.76.13:27001",
"92.12.76.14:27001"
],
"arbiters" : [
"92.12.76.15:27001"
],
"setName" : "shard1",
"setVersion" : 1,
"ismaster" : false,
"secondary" : false,
"primary" : "92.12.76.14:27001",
"arbiterOnly" : true,
"me" : "92.12.76.15:27001",
"lastWrite" : {
"opTime" : {
"ts" : Timestamp(1546841373, 95),
"t" : NumberLong(11)
},
"lastWriteDate" : ISODate("2019-01-07T06:09:33Z")
},
"rbid" : 734455356
},
"storageEngine" : {
"name" : "wiredTiger",
"supportsCommittedReads" : true,
"readOnly" : false,
"persistent" : true
},
"tcmalloc" : {
"generic" : {
"current_allocated_bytes" : 60554520,
"heap_size" : 73261056
},
"tcmalloc" : {
"pageheap_free_bytes" : 2949120,
"pageheap_unmapped_bytes" : 6811648,
"max_total_thread_cache_bytes" : NumberLong(1073741824),
"current_total_thread_cache_bytes" : 878808,
"total_free_bytes" : 2945768,
"central_cache_free_bytes" : 269456,
"transfer_cache_free_bytes" : 1797504,
"thread_cache_free_bytes" : 878808,
"aggressive_memory_decommit" : 0,
"formattedString" : "------------------------------------------------\nMALLOC:       60554520 (   57.7 MiB) Bytes in use by application\nMALLOC: +      2949120 (    2.8 MiB) Bytes in page heap freelist\nMALLOC: +       269456 (    0.3 MiB) Bytes in central cache freelist\nMALLOC: +      1797504 (    1.7 MiB) Bytes in transfer cache freelist\nMALLOC: +       878808 (    0.8 MiB) Bytes in thread cache freelists\nMALLOC: +      1302720 (    1.2 MiB) Bytes in malloc metadata\nMALLOC:   ------------\nMALLOC: =     67752128 (   64.6 MiB) Actual memory used (physical + swap)\nMALLOC: +      6811648 (    6.5 MiB) Bytes released to OS (aka unmapped)\nMALLOC:   ------------\nMALLOC: =     74563776 (   71.1 MiB) Virtual address space used\nMALLOC:\nMALLOC:            762              Spans in use\nMALLOC:             22              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"
}
},
"wiredTiger" : {
"uri" : "statistics:",
"LSM" : {
"application work units currently queued" : 0,
"merge work units currently queued" : 0,
"rows merged in an LSM tree" : 0,
"sleep for LSM checkpoint throttle" : 0,
"sleep for LSM merge throttle" : 0,
"switch work units currently queued" : 0,
"tree maintenance operations discarded" : 0,
"tree maintenance operations executed" : 0,
"tree maintenance operations scheduled" : 0,
"tree queue hit maximum" : 0
},
"async" : {
"current work queue length" : 0,
"maximum work queue length" : 0,
"number of allocation state races" : 0,
"number of flush calls" : 0,
"number of operation slots viewed for allocation" : 0,
"number of times operation allocation failed" : 0,
"number of times worker found no work" : 0,
"total allocations" : 0,
"total compact calls" : 0,
"total insert calls" : 0,
"total remove calls" : 0,
"total search calls" : 0,
"total update calls" : 0
},
"block-manager" : {
"blocks pre-loaded" : 9,
"blocks read" : 46,
"blocks written" : 88,
"bytes read" : 200704,
"bytes written" : 520192,
"bytes written for checkpoint" : 520192,
"mapped blocks read" : 0,
"mapped bytes read" : 0
},
"cache" : {
"application threads page read from disk to cache count" : 8,
"application threads page read from disk to cache time (usecs)" : 534,
"application threads page write from cache to disk count" : 0,
"application threads page write from cache to disk time (usecs)" : 0,
"bytes belonging to page images in the cache" : 26200,
"bytes currently in the cache" : 67488,
"bytes not belonging to page images in the cache" : 41287,
"bytes read into cache" : 24260,
"bytes written from cache" : 219790,
"checkpoint blocked page eviction" : 0,
"eviction calls to get a page" : 3631,
"eviction calls to get a page found queue empty" : 3631,
"eviction calls to get a page found queue empty after locking" : 0,
"eviction currently operating in aggressive mode" : 0,
"eviction empty score" : 0,
"eviction server candidate queue empty when topping up" : 0,
"eviction server candidate queue not empty when topping up" : 0,
"eviction server evicting pages" : 0,
"eviction server slept, because we did not make progress with eviction" : 0,
"eviction server unable to reach eviction goal" : 0,
"eviction state" : 16,
"eviction walks abandoned" : 0,
"eviction worker thread active" : 0,
"eviction worker thread created" : 0,
"eviction worker thread evicting pages" : 0,
"eviction worker thread removed" : 0,
"eviction worker thread stable number" : 0,
"failed eviction of pages that exceeded the in-memory maximum" : 0,
"files with active eviction walks" : 0,
"files with new eviction walks started" : 0,
"force re-tuning of eviction workers once in a while" : 0,
"hazard pointer blocked page eviction" : 0,
"hazard pointer check calls" : 0,
"hazard pointer check entries walked" : 0,
"hazard pointer maximum array length" : 0,
"in-memory page passed criteria to be split" : 0,
"in-memory page splits" : 0,
"internal pages evicted" : 0,
"internal pages split during eviction" : 0,
"leaf pages split during eviction" : 0,
"lookaside table insert calls" : 0,
"lookaside table remove calls" : 0,
"maximum bytes configured" : 270403633152,
"maximum page size at eviction" : 0,
"modified pages evicted" : 0,
"modified pages evicted by application threads" : 0,
"overflow pages read into cache" : 0,
"overflow values cached in memory" : 0,
"page split during eviction deepened the tree" : 0,
"page written requiring lookaside records" : 0,
"pages currently held in the cache" : 19,
"pages evicted because they exceeded the in-memory maximum" : 0,
"pages evicted because they had chains of deleted items" : 0,
"pages evicted by application threads" : 0,
"pages queued for eviction" : 0,
"pages queued for urgent eviction" : 0,
"pages queued for urgent eviction during walk" : 0,
"pages read into cache" : 18,
"pages read into cache requiring lookaside entries" : 0,
"pages requested from the cache" : 345,
"pages seen by eviction walk" : 0,
"pages selected for eviction unable to be evicted" : 0,
"pages walked for eviction" : 0,
"pages written from cache" : 44,
"pages written requiring in-memory restoration" : 0,
"percentage overhead" : 8,
"tracked bytes belonging to internal pages in the cache" : 14683,
"tracked bytes belonging to leaf pages in the cache" : 52805,
"tracked dirty bytes in the cache" : 0,
"tracked dirty pages in the cache" : 0,
"unmodified pages evicted" : 0
},
"connection" : {
"auto adjusting condition resets" : 80,
"auto adjusting condition wait calls" : 173703031,
"files currently open" : 13,
"memory allocations" : 405335256,
"memory frees" : 405334320,
"memory re-allocations" : 86864333,
"pthread mutex condition wait calls" : 466333645,
"pthread mutex shared lock read-lock calls" : 173701346,
"pthread mutex shared lock write-lock calls" : 28948735,
"total fsync I/Os" : 82,
"total read I/Os" : 505,
"total write I/Os" : 128
},
"cursor" : {
"cursor create calls" : 42,
"cursor insert calls" : 31,
"cursor next calls" : 95,
"cursor prev calls" : 7,
"cursor remove calls" : 1,
"cursor reset calls" : 322,
"cursor restarted searches" : 0,
"cursor search calls" : 303,
"cursor search near calls" : 9,
"cursor update calls" : 0,
"truncate calls" : 0
},
"data-handle" : {
"connection data handles cur
3ff7
rently active" : 10,
"connection sweep candidate became referenced" : 0,
"connection sweep dhandles closed" : 0,
"connection sweep dhandles removed from hash list" : 9,
"connection sweep time-of-death sets" : 9,
"connection sweeps" : 2895435,
"session dhandles swept" : 0,
"session sweep attempts" : 21
},
"lock" : {
"checkpoint lock acquisitions" : 13,
"checkpoint lock application thread wait time (usecs)" : 0,
"checkpoint lock internal thread wait time (usecs)" : 3,
"handle-list lock eviction thread wait time (usecs)" : 7812945,
"metadata lock acquisitions" : 13,
"metadata lock application thread wait time (usecs)" : 0,
"metadata lock internal thread wait time (usecs)" : 5,
"schema lock acquisitions" : 24,
"schema lock application thread wait time (usecs)" : 0,
"schema lock internal thread wait time (usecs)" : 0,
"table lock acquisitions" : 0,
"table lock application thread time waiting for the table lock (usecs)" : 0,
"table lock internal thread time waiting for the table lock (usecs)" : 0
},
"log" : {
"busy returns attempting to switch slots" : 0,
"consolidated slot closures" : 23,
"consolidated slot join active slot closed" : 0,
"consolidated slot join races" : 0,
"consolidated slot join transitions" : 23,
"consolidated slot joins" : 31,
"consolidated slot transitions unable to find free slot" : 0,
"consolidated slot unbuffered writes" : 0,
"log bytes of payload data" : 8096,
"log bytes written" : 10752,
"log files manually zero-filled" : 0,
"log flush operations" : 289208683,
"log force write operations" : 318157332,
"log force write operations skipped" : 318157370,
"log records compressed" : 9,
"log records not compressed" : 0,
"log records too small to compress" : 22,
"log release advances write LSN" : 15,
"log scan operations" : 3,
"log scan records requiring two reads" : 3,
"log server thread advances write LSN" : 8,
"log server thread write LSN walk skipped" : 28952054,
"log sync operations" : 23,
"log sync time duration (usecs)" : 169202,
"log sync_dir operations" : 1,
"log sync_dir time duration (usecs)" : 1457,
"log write operations" : 31,
"logging bytes consolidated" : 10368,
"maximum log file size" : 104857600,
"number of pre-allocated log files to create" : 2,
"pre-allocated log files not ready and missed" : 1,
"pre-allocated log files prepared" : 2,
"pre-allocated log files used" : 0,
"records processed by log scan" : 9,
"total in-memory size of compressed records" : 11837,
"total log buffer size" : 33554432,
"total size of compressed records" : 7236,
"written slots coalesced" : 0,
"yields waiting for previous log file close" : 0
},
"reconciliation" : {
"fast-path pages deleted" : 0,
"page reconciliation calls" : 44,
"page reconciliation calls for eviction" : 0,
"pages deleted" : 0,
"split bytes currently awaiting free" : 0,
"split objects currently awaiting free" : 0
},
"session" : {
"open cursor count" : 29,
"open session count" : 16,
"table alter failed calls" : 0,
"table alter successful calls" : 0,
"table alter unchanged and skipped" : 0,
"table compact failed calls" : 0,
"table compact successful calls" : 0,
"table create failed calls" : 0,
"table create successful calls" : 0,
"table drop failed calls" : 0,
"table drop successful calls" : 0,
"table rebalance failed calls" : 0,
"table rebalance successful calls" : 0,
"table rename failed calls" : 0,
"table rename successful calls" : 0,
"table salvage failed calls" : 0,
"table salvage successful calls" : 0,
"table truncate failed calls" : 0,
"table truncate successful calls" : 0,
"table verify failed calls" : 0,
"table verify successful calls" : 0
},
"thread-state" : {
"active filesystem fsync calls" : 0,
"active filesystem read calls" : 0,
"active filesystem write calls" : 0
},
"thread-yield" : {
"application thread time evicting (usecs)" : 0,
"application thread time waiting for cache (usecs)" : 0,
"page acquire busy blocked" : 0,
"page acquire eviction blocked" : 0,
"page acquire locked blocked" : 0,
"page acquire read blocked" : 0,
"page acquire time sleeping (usecs)" : 0
},
"transaction" : {
"number of named snapshots created" : 0,
"number of named snapshots dropped" : 0,
"transaction begins" : 26,
"transaction checkpoint currently running" : 0,
"transaction checkpoint generation" : 13,
"transaction checkpoint max time (msecs)" : 17,
"transaction checkpoint min time (msecs)" : 2,
"transaction checkpoint most recent time (msecs)" : 4,
"transaction checkpoint scrub dirty target" : 0,
"transaction checkpoint scrub time (msecs)" : 0,
"transaction checkpoint total time (msecs)" : 74,
"transaction checkpoints" : 13,
"transaction checkpoints skipped because database was clean" : 482565,
"transaction failures due to cache overflow" : 0,
"transaction fsync calls for checkpoint after allocating the transaction ID" : 13,
"transaction fsync duration for checkpoint after allocating the transaction ID (usecs)" : 0,
"transaction range of IDs currently pinned" : 0,
"transaction range of IDs currently pinned by a checkpoint" : 0,
"transaction range of IDs currently pinned by named snapshots" : 0,
"transaction sync calls" : 0,
"transactions committed" : 8,
"transactions rolled back" : 18
},
"concurrentTransactions" : {
"write" : {
"out" : 0,
"available" : 128,
"totalTickets" : 128
},
"read" : {
"out" : 0,
"available" : 128,
"totalTickets" : 128
}
}
},
"mem" : {
"bits" : 64,
"resident" : 51,
"virtual" : 437,
"supported" : true,
"mapped" : 0,
"mappedWithJournal" : 0
},
"metrics" : {
"commands" : {
"_isSelf" : {
"failed" : NumberLong(0),
"total" : NumberLong(11)
},
"buildInfo" : {
"failed" : NumberLong(0),
"total" : NumberLong(2)
},
"isMaster" : {
"failed" : NumberLong(0),
"total" : NumberLong(30)
},
"replSetGetStatus" : {
"failed" : NumberLong(0),
"total" : NumberLong(11)
},
"replSetHeartbeat" : {
"failed" : NumberLong(0),
"total" : NumberLong(28866960)
},
"replSetRequestVotes" : {
"failed" : NumberLong(0),
"total" : NumberLong(22)
},
"saslContinue" : {
"failed" : NumberLong(0),
"total" : NumberLong(74)
},
"saslStart" : {
"failed" : NumberLong(1),
"total" : NumberLong(38)
},
"serverStatus" : {
"failed" : NumberLong(0),
"total" : NumberLong(1)
},
"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(0),
"updated" : NumberLong(0)
},
"getLastError" : {
"wtime" : {
"num" : 0,
"totalMillis" : 0
},
"wtimeouts" : NumberLong(0)
},
"operation" : {
"scanAndOrder" : NumberLong(0),
"writeConflicts" : NumberLong(0)
},
"queryExecutor" : {
"scanned" : NumberLong(0),
"scannedObjects" : NumberLong(0)
},
"record" : {
"moves" : NumberLong(0)
},
"repl" : {
"executor" : {
"counters" : {
"eventCreated" : 0,
"eventWait" : 0,
"cancels" : 0,
"waits" : 0,
"scheduledNetCmd" : 11635483,
"scheduledDBWork" : 1,
"scheduledXclWork" : 0,
"scheduledWorkAt" : 12314625,
"scheduledWork" : 0,
"schedulingFailures" : 0
},
"queues" : {
"networkInProgress" : 0,
"dbWorkInProgress" : 0,
"exclusiveInProgress" : 0,
"sleepers" : 2,
"ready" : 0,
"free" : 1
},
"unsignaledEvents" : 2,
"eventWaiters" : 0,
"shuttingDown" : false,
"networkInterface" : "\nNetworkInterfaceASIO Operations' Diagnostic:\nOperation:    Count:     \nConnecting    0          \nIn Progress   0          \nSucceeded     11551189   \nCanceled      0          \nFailed        84294      \nTimed Out     145        \n\n"
},
"apply" : {
"attemptsToBecomeSecondary" : NumberLong(0),
"batches" : {
"num" : 0,
"totalMillis" : 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,
"totalMillis" : 0
},
"ops" : NumberLong(0),
"readersCreated" : NumberLong(0)
},
"preload" : {
"docs" : {
"num" : 0,
"totalMillis" : 0
},
"indexes" : {
"num" : 0,
"totalMillis" : 0
}
}
},
"storage" : {
"freelist" : {
"search" : {
"bucketExhausted" : NumberLong(0),
"requests" : NumberLong(0),
"scanned" : NumberLong(0)
}
}
},
"ttl" : {
"deletedDocuments" : NumberLong(0),
"passes" : NumberLong(0)
}
},
"ok" : 1
}

其中有这个

[code]"storageEngine" : {
"name" : "wiredTiger",
"supportsCommittedReads" : true,
"readOnly" : false,
"persistent" : true
},

mongo内存占用过大http://www.ipcpu.com/2017/01/mongodb-oom/

查看WiredTiger内部缓存到底占用了多少内存的方式是，在mongo shell中之行以下命令

[code]db.runCommand( { serverStatus: 1 } ).wiredTiger.cache["bytes currently in the cache"]

如果不想重启mongoDB，可以在线修改，如下

[code]db.adminCommand({setParameter: 1, wiredTigerEngineRuntimeConfig: "cache_size=8G"})