MongoDB错误32-bit servers don't have journaling enabled by default解决方法
每次启动MongoDB时总是会收到如下Uncleanshutdown提示，总结了一下出现该问题的原因及解决方法。
提示如下：
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D:\GREENT~1\PowerCmd>mongod--auth-dbpathC:\mongo\MongoDB\mongo\data
WedMay1616:06:50
WedMay1616:06:50warning:32-bitserversdon'thavejournalingenabledbydefault.Pleaseuse--journalifyouwantdurability.
WedMay1616:06:50
WedMay1616:06:50[initandlisten]MongoDBstarting:pid=5016port=27017dbpath=C:\mongo\MongoDB\mongo\data32-bithost=mxh
WedMay1616:06:50[initandlisten]
WedMay1616:06:50[initandlisten]**NOTE:whenusingMongoDB32bit,youarelimitedtoabout2gigabytesofdata
WedMay1616:06:50[initandlisten]** seehttp://blog.mongodb.org/post/137788967/32-bit-limitations
WedMay1616:06:50[initandlisten]** with--journal,thelimitislower
WedMay1616:06:50[initandlisten]
WedMay1616:06:50[initandlisten]dbversionv2.0.1,pdfileversion4.5
WedMay1616:06:50[initandlisten]gitversion:3a5cf0e2134a830d38d2d1aae7e88cac31bdd684
WedMay1616:06:50[initandlisten]buildinfo:windows(5,1,2600,2,'ServicePack3')BOOST_LIB_VERSION=1_42
WedMay1616:06:50[initandlisten]options:{auth:true,dbpath:"C:\mongo\MongoDB\mongo\data"}
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Uncleanshutdowndetected.
Pleasevisithttp://dochub.mongodb.org/core/repairforrecoveryinstructions.
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WedMay1616:06:51[initandlisten]exceptionininitAndListen:12596oldlockfile,terminating
WedMay1616:06:51dbexit:
WedMay1616:06:51[initandlisten]shutdown:goingtocloselisteningsockets...
WedMay1616:06:51[initandlisten]shutdown:goingtoflushdiaglog...
WedMay1616:06:51[initandlisten]shutdown:goingtoclosesockets...
WedMay1616:06:51[initandlisten]shutdown:waitingforfspreallocator...
WedMay1616:06:51[initandlisten]shutdown:closingallfiles...
WedMay1616:06:51[initandlisten]closeAllFiles()finished
WedMay1616:06:51dbexit:reallyexitingnow
经过多次测试发现，造成这种情况的原因是我使用PowerCMD启动MongoDB之后直接关掉PowerCMD窗口之后造成的，如果在关闭PowerCMD窗口之前使用[ctrl+c]快捷键终止mongod的运行也不会出现此种情况。而且，使用普通的CMD窗口运行mongo命令即使直接关掉窗口也不会出现该问题，看来还是使用原生程序更靠谱。
发生了此种情况解决方法也很简单，使用如下参数repair即可：
mongod--auth-dbpathC:\mongo\MongoDB\mongo\data--repair
然后重新启动即可：
D:\GREENT~1\PowerCmd>mongod--auth-dbpathC:\mongo\MongoDB\mongo\data
WedMay1616:44:35
WedMay1616:44:35warning:32-bitserversdon'thavejournalingenabledbydefault.Pleaseuse--journalifyouwantdurability.
WedMay1616:44:35
WedMay1616:44:35[initandlisten]MongoDBstarting:pid=9616port=27017dbpath=C:\mongo\MongoDB\mongo\data32-bithost=mxh
WedMay1616:44:35[initandlisten]
WedMay1616:44:35[initandlisten]**NOTE:whenusingMongoDB32bit,youarelimitedtoabout2gigabytesofdata
WedMay1616:44:35[initandlisten]** seehttp://blog.mongodb.org/post/137788967/32-bit-limitations
WedMay1616:44:35[initandlisten]** with--journal,thelimitislower
WedMay1616:44:35[initandlisten]
WedMay1616:44:35[initandlisten]dbversionv2.0.1,pdfileversion4.5
WedMay1616:44:35[initandlisten]gitversion:3a5cf0e2134a830d38d2d1aae7e88cac31bdd684
WedMay1616:44:35[initandlisten]buildinfo:windows(5,1,2600,2,'ServicePack3')BOOST_LIB_VERSION=1_42
WedMay1616:44:35[initandlisten]options:{auth:true,dbpath:"C:\mongo\MongoDB\mongo\data"}
WedMay1616:44:35[initandlisten]waitingforconnectionsonport27017
WedMay1616:44:35[websvr]adminwebconsolewaitingforconnectionsonport28017
还有一些情况会造成这种Uncleanshutdown，解决方法可参考官方文档：
http://www.mongodb.org/display/DOCS/Durability+and+Repair