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