MongoDB最基本命令速查笔记
安装后在控制台输入:
mongo启动客户端。
show dbs显示所有数据库。
use xxx选中数据库为当前使用的数据库。
show collections显示当前数据库的所有集合。
db.colleciton.find()来查找表格的所有数据。
db.serverStatus()查看数据库服务器的状态。
db.stats()查询指定数据库的统计信息。
use xxx如果数据库不存在则创建数据库（必须在虽然插入一条数据）
db.storeCollection.insert({'version':'13', 'segment':'456'})插入数据，同时创建集合
db.dropDatabase()删除数据库
db.mycoll.drop()删除集合
db.storeCollection.save({'version':'3.5', 'segment':'e3ol6'})更新记录
db.storeCollection.remove({'version':'3.5'}) 删除记录
db.page.ensureIndex({'title':1, 'url':-1})创建索引，1正序，-1逆序
db.page.getIndexes()查询建立的索引
db.mycoll.dropIndex(name) 删除索引，如果不带参数，删除所有索引
db.baseSe.reIndex()重建索引
db.baseSe.storageSize()查询指定数据库的集合的可用的存储空间
db.baseSe.totalSize()查询集合已分配的存储空间
PS：非正常关闭后无法启动问题
段时间不小心非正常关闭了mongoDB，准备重启却发现不行，错误信息如下：
Tue Apr 17 11:13:30
Tue Apr 17 11:13:30 warning: 32-bit servers don't have journaling enabled by default. Please use --journal if you want durability.
Tue Apr 17 11:13:30
Tue Apr 17 11:13:30 [initandlisten] MongoDB starting : pid=7128 port=27017 dbpath=D:\Programs\mongodb204\db 32-bit host=FALCON
Tue Apr 17 11:13:30 [initandlisten]
Tue Apr 17 11:13:30 [initandlisten] ** NOTE: when using MongoDB 32 bit, you are limited to about 2 gigabytes of data
Tue Apr 17 11:13:30 [initandlisten] ** see http://blog.mongodb.org/post/137788967/32-bit-limitations
Tue Apr 17 11:13:30 [initandlisten] ** with --journal, the limit is lower
Tue Apr 17 11:13:30 [initandlisten]
Tue Apr 17 11:13:30 [initandlisten] db version v2.0.4, pdfile version 4.5
Tue Apr 17 11:13:30 [initandlisten] git version: 329f3c47fe8136c03392c8f0e548506cb21f8ebf
Tue Apr 17 11:13:30 [initandlisten] build info: windows sys.getwindowsversion(major=6, minor=0, build=6002, platform=2, service_pack='Service Pack 2')BOOST_LIB_VERSION=1_42
Tue Apr 17 11:13:30 [initandlisten] options: { dbpath: "D:\Programs\mongodb204\db" }
**************
Unclean shutdown detected.
Please visit http://dochub.mongodb.org/core/repair for recovery instructions.
*************
Tue Apr 17 11:13:30 [initandlisten] exception in initAndListen: 12596 old lock file, terminating
Tue Apr 17 11:13:30 dbexit:
Tue Apr 17 11:13:30 [initandlisten] shutdown: going to close listening sockets...
Tue Apr 17 11:13:30 [initandlisten] shutdown: going to flush diaglog...
Tue Apr 17 11:13:30 [initandlisten] shutdown: going to close sockets...
Tue Apr 17 11:13:30 [initandlisten] shutdown: waiting for fs preallocator...
Tue Apr 17 11:13:30 [initandlisten] shutdown: closing all files...
Tue Apr 17 11:13:30 [initandlisten] closeAllFiles() finished
Tue Apr 17 11:13:30 dbexit: really exiting now
解决方法：
1、删除%MONGO_HOME%/db下的.lock文件
2、输入命令 mongod --repair
3、重启mongoDB
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