目錄：

MongoDB學(xué)習(xí)筆記（一）環(huán)境搭建與常用操作
MongoDB學(xué)習(xí)筆記（二）使用Java操作MongoDB
MongoDB學(xué)習(xí)筆記（三）使用Spring Data操作MongoDB
MongoDB學(xué)習(xí)筆記（四）使用Java進行實時監(jiān)控與數(shù)據(jù)收集

最近在做一個Java開發(fā)的監(jiān)控系統(tǒng)，里面有一個模塊是監(jiān)控MongoDB的。看到網(wǎng)絡(luò)上比較少這塊資料，特記錄如下：
1.下載MongoDB的Java驅(qū)動包。
2.獲取空間使用量等數(shù)據(jù)：

CommandResult stats=db.getStats();

獲取到的數(shù)據(jù)如下：

{"serverUsed": "172.1.1.3:15080","db": "monitor","collections": 27,"objects": 26358,"avgObjSize": 1044.4045830487898,"dataSize": 27528416,"storageSize": 53030912,"numExtents": 73,"indexes": 25,"indexSize": 1062880,"fileSize": 1006632960,"nsSizeMB": 16,"dataFileVersion": {"major": 4,"minor": 5},"extentFreeList": {"num": 71,"totalSize": 654319616},"ok": 1.0 }

3.獲取連接數(shù)等數(shù)據(jù)：

CommandResult stats=db.command("serverStatus");

獲取到的數(shù)據(jù)如下：

{"serverUsed": "172.1.1.3:15080","host": "docker:80","version": "2.6.6","process": "mongod","pid": 49,"uptime": 687177.0,"uptimeMillis": 687177657,"uptimeEstimate": 679910.0,"localTime": {"$date": "2016-03-08T16:15:46.815Z"},"asserts": {"regular": 1,"warning": 1,"msg": 0,"user": 58812,"rollovers": 0},"backgroundFlushing": {"flushes": 11452,"total_ms": 143088,"average_ms": 12.494586098498079,"last_ms": 78,"last_finished": {"$date": "2016-03-08T16:14:50.610Z"}},"connections": {"current": 13,"available": 806,"totalCreated": 1794},"cursors": {"note": "deprecated, use server status metrics","clientCursors_size": 0,"totalOpen": 0,"pinned": 0,"totalNoTimeout": 38,"timedOut": 3},"dur": {"commits": 29,"journaledMB": 0.008192,"writeToDataFilesMB": 0.003634,"compression": 2.0262181548355183,"commitsInWriteLock": 0,"earlyCommits": 0,"timeMs": {"dt": 3009,"prepLogBuffer": 0,"writeToJournal": 40,"writeToDataFiles": 0,"remapPrivateView": 0}},"extra_info": {"note": "fields vary by platform","heap_usage_bytes": 67277952,"page_faults": 692},"globalLock": {"totalTime": 687177659000,"lockTime": 47304462,"currentQueue": {"total": 0,"readers": 0,"writers": 0},"activeClients": {"total": 0,"readers": 0,"writers": 0}},"indexCounters": {"accesses": 431329,"hits": 431329,"misses": 0,"resets": 0,"missRatio": 0.0},"locks": {".": {"timeLockedMicros": {"R": 9599442,"W": 47304462},"timeAcquiringMicros": {"R": 4543336,"W": 1125820}},"admin": {"timeLockedMicros": {"r": 2625360,"w": 0},"timeAcquiringMicros": {"r": 158482,"w": 0}}},"network": {"bytesIn": 96033519,"bytesOut": 177762851,"numRequests": 878581},"opcounters": {"insert": 108167,"query": 262770,"update": 1014,"delete": 6,"getmore": 50,"command": 632623},"opcountersRepl": {"insert": 0,"query": 0,"update": 0,"delete": 0,"getmore": 0,"command": 0},"recordStats": {"accessesNotInMemory": 2,"pageFaultExceptionsThrown": 1,"admin": {"accessesNotInMemory": 0,"pageFaultExceptionsThrown": 0}},"writeBacksQueued": false,"mem": {"bits": 64,"resident": 196,"virtual": 4782,"supported": true,"mapped": 2000,"mappedWithJournal": 4000},"metrics": {"cursor": {"timedOut": 3,"open": {"noTimeout": 38,"pinned": 0,"total": 0}},"document": {"deleted": 21,"inserted": 78767,"returned": 103245,"updated": 1014},"getLastError": {"wtime": {"num": 0,"totalMillis": 0},"wtimeouts": 0},"operation": {"fastmod": 1,"idhack": 0,"scanAndOrder": 0},"queryExecutor": {"scanned": 0,"scannedObjects": 0},"record": {"moves": 0},"repl": {"apply": {"batches": {"num": 0,"totalMillis": 0 },"ops": 0},"buffer": {"count": 0,"maxSizeBytes": 268435456,"sizeBytes": 0},"network": {"bytes": 0,"getmores": {"num": 0,"totalMillis": 0 },"ops": 0,"readersCreated": 0},"preload": {"docs": {"num": 0,"totalMillis": 0 },"indexes": {"num": 0,"totalMillis": 0 }}},"storage": {"freelist": {"search": {"bucketExhausted": 0,"requests": 130732,"scanned": 231145 }}},"ttl": {"deletedDocuments": 0,"passes": 11452}},"ok": 1.0 }

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