每次啟動MongoDB時總是會收到如下 Unclean shutdown 提示，總結了一下出現該問題的原因及解決方法。
提示如下：
復制代碼代碼如下:
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D:/GREENT~1/PowerCmd>mongod --auth -dbpath C:/mongo/MongoDB/mongo/data
Wed May 16 16:06:50
Wed May 16 16:06:50 warning: 32-bit servers don't have journaling enabled by default. Please use --journal if you want durability.
Wed May 16 16:06:50
Wed May 16 16:06:50 [initandlisten] MongoDB starting : pid=5016 port=27017 dbpath=C:/mongo/MongoDB/mongo/data 32-bit host=mxh
Wed May 16 16:06:50 [initandlisten]
Wed May 16 16:06:50 [initandlisten] ** NOTE: when using MongoDB 32 bit, you are limited to about 2 gigabytes of data
Wed May 16 16:06:50 [initandlisten] ** see http://blog.mongodb.org/post/137788967/32-bit-limitations
Wed May 16 16:06:50 [initandlisten] ** with --journal, the limit is lower
Wed May 16 16:06:50 [initandlisten]
Wed May 16 16:06:50 [initandlisten] db version v2.0.1, pdfile version 4.5
Wed May 16 16:06:50 [initandlisten] git version: 3a5cf0e2134a830d38d2d1aae7e88cac31bdd684
Wed May 16 16:06:50 [initandlisten] build info: windows (5, 1, 2600, 2, 'Service Pack 3') BOOST_LIB_VERSION=1_42
Wed May 16 16:06:50 [initandlisten] options: { auth: true, dbpath: "C:/mongo/MongoDB/mongo/data" }
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Unclean shutdown detected.
Please visit http://dochub.mongodb.org/core/repair for recovery instructions.
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Wed May 16 16:06:51 [initandlisten] exception in initAndListen: 12596 old lock file, terminating
Wed May 16 16:06:51 dbexit:
Wed May 16 16:06:51 [initandlisten] shutdown: going to close listening sockets...
Wed May 16 16:06:51 [initandlisten] shutdown: going to flush diaglog...
Wed May 16 16:06:51 [initandlisten] shutdown: going to close sockets...
Wed May 16 16:06:51 [initandlisten] shutdown: waiting for fs preallocator...
Wed May 16 16:06:51 [initandlisten] shutdown: closing all files...
Wed May 16 16:06:51 [initandlisten] closeAllFiles() finished
Wed May 16 16:06:51 dbexit: really exiting now
經過多次測試發現，造成這種情況的原因是我使用PowerCMD啟動MongoDB之后直接關掉PowerCMD窗口之后造成的，如果在關閉PowerCMD窗口之前使用 [ctrl + c] 快捷鍵終止mongod的運行也不會出現此種情況。而且，使用普通的CMD窗口運行mongo命令即使直接關掉窗口也不會出現該問題，看來還是使用原生程序更靠譜。
發生了此種情況解決方法也很簡單，使用如下參數repair即可：
復制代碼代碼如下:
mongod --auth -dbpath C:/mongo/MongoDB/mongo/data --repair
然后重新啟動即可：
復制代碼代碼如下:
D:/GREENT~1/PowerCmd>mongod --auth -dbpath C:/mongo/MongoDB/mongo/data
Wed May 16 16:44:35
Wed May 16 16:44:35 warning: 32-bit servers don't have journaling enabled by default. Please use --journal if you want durability.
Wed May 16 16:44:35
Wed May 16 16:44:35 [initandlisten] MongoDB starting : pid=9616 port=27017 dbpath=C:/mongo/MongoDB/mongo/data 32-bit host=mxh
Wed May 16 16:44:35 [initandlisten]
Wed May 16 16:44:35 [initandlisten] ** NOTE: when using MongoDB 32 bit, you are limited to about 2 gigabytes of data
Wed May 16 16:44:35 [initandlisten] ** see http://blog.mongodb.org/post/137788967/32-bit-limitations
Wed May 16 16:44:35 [initandlisten] ** with --journal, the limit is lower
Wed May 16 16:44:35 [initandlisten]
Wed May 16 16:44:35 [initandlisten] db version v2.0.1, pdfile version 4.5
Wed May 16 16:44:35 [initandlisten] git version: 3a5cf0e2134a830d38d2d1aae7e88cac31bdd684
Wed May 16 16:44:35 [initandlisten] build info: windows (5, 1, 2600, 2, 'Service Pack 3') BOOST_LIB_VERSION=1_42
Wed May 16 16:44:35 [initandlisten] options: { auth: true, dbpath: "C:/mongo/MongoDB/mongo/data" }
Wed May 16 16:44:35 [initandlisten] waiting for connections on port 27017
Wed May 16 16:44:35 [websvr] admin web console waiting for connections on port 28017
還有一些情況會造成這種 Unclean shutdown，解決方法可參考官方文檔：
http://www.mongodb.org/display/DOCS/Durability+and+Repair
