MongoDB Learning Note One installation and basic commands

First, MongoDB installation configuration 1, get the latest version:

wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.0.2.tgz

2, decompression can be performed

tar zxvf mongodb-linux-x86_64-2.0.2.tgztar zxvf mongodb-linux-x86_64-2.0.2.tgzcd /usr/mongodb-linux-x86_64-2.0.2/bin但是在运行前，需要创建mongodb需要的存放数据和日志的目录：sudo mkdir -p /data/db/journalsudo chmod -R 777 /data/db/启动mongodb server,-journal 代表要写日志，-maxConns=2400代表mongodb 可以接受2400个   tcp连接，-rest代表可以允许客户端通过rest API访问mongdb server../mongod -journal -maxConns=2400 -rest

3. Related instructions

After the service program starts, the terminal displays some information, such as: Wed 16:40:03 [Initandlisten] MongoDB starting:pid=2410 port=27017 Dbpath=/data/db/64-bitwe D 16:40:03 [Initandlisten] db version v2.0.2, pdfile version 4.5Wed 16:40:03 [Initandlisten] git version:c2 06d77e94bc3b65c76681df5a6b605f68a2de05wed 16:40:03 [Initandlisten] Build sys info:linux bs-linux64.10gen.cc 2.6.21.7-2.ec2.v1.2.fc8xen #1 SMP Fri Nov 17:48:28 EST x86_64 boost_lib_version=1_41wed 16:40:03 [Initandli Sten] Journal dir=/data/db/journalwed 16:40:03 [Initandlisten] recover:no journal files present, no recovery need Edwed 16:40:06 [Initandlisten] preallocateisfaster=true 33.84Wed 16:40:08 [Initandlisten] Preallocateisfast Er=true 36.84Wed 16:40:11 [Initandlisten] preallocateisfaster=true 37.48Wed 16:40:11 [Initandlisten] Preallo Cating a journal file/data/db/journal/prealloc.0wed 16:41:03 [Initandlisten] preallocating a journal file/data/db /journal/prealloc.1wed 31 16: 41:55 [Initandlisten] preallocating a journal file/data/db/journal/prealloc.2wed-16:42:48 [Initandlisten] Waitin G for connections in Port 27017Wed 16:42:48 [Initandlisten]-maxconns too high, can only handle 819Wed 31 16:42 : [WEBSVR] Web admin interface listening on port 28017

4. Environmental information

机器IP: 10.0.14.218安装目录 : /usr/local/mongodb/bin数据存储目录: /data/dbweb console : http://10.0.14.218:28017/web admin port : 28017

Ii. MongoDB Entry-based command

• Show DBS: Display Database list
• Show Collections: Displays a collection in the current database (similar to a table in a relational database)
• Show Users: Show user
• Db.help (): Show database Operations Command with a lot of commands
• Db.foo.find (): Data lookup for the Foo collection in the current database (all data is listed because there are no conditions)

• Use Yourdb; Toggles the creation of the database, which automatically creates the current database when a collection (table) is created.
• Db.dropdatabase (); Please use caution when deleting the current database.
• Db.clonedatabase ("127.0.0.1"); Clones data from a database on a specified machine to the current database
• Db.copydatabase ("MyDB", "temp", "127.0.0.1"), copy the native mydb data to the TEMP database
• Db.repairdatabase (); Repairing the current database
• Db.getname (); Gets the current database name, the same as the DB command effect.
• Db.stats (); View the status of the DB.
• Db.version (); View the current version of the DB.
• Db.getmondo (); View the current MongoDB link server address.

• Db.createcollection ("Collname", {size:20, Capped:5, max:100}); Creates a clustered collection.

• Db.getcollection (' dict '); Gets the clustered collection of the specified name.

• Db.getcollectionnames (); Gets the names of all the clustered collections under the current DB.
• Db.printcollectionstats (); Displays the status of all clustered indexes in the current DB.
• Db.dict.help (); View Help

• Db.adduser ("Zhuoxuan", "admin", true); Add user, set password, read-only
• Db.auth (' Zhuoxuan ', ' admin '); Database authentication, security mode
• Show Users; All users are displayed.
• Db.removeuser ("Zhuoxuan"); Delete user account