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MongoDB最基本命令速查笔记

  • 时间:2021-03-18 04:46 编辑: 来源: 阅读:
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摘要: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 [b]PS:非正常关闭后无法启动问题 [/b]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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