手里有本《MongoDB权威指南》，打算做个读书笔记，把常规命令、数据类型过一遍，强迫记忆。
集群配置相关链接：
征服 Mongodb 之 安装与系统服务配置
征服 Mongodb 之 主从复制&集群复制
基本操作相关链接：
征服 Mongodb 之 常用命令、基本数据类型
征服 Mongodb 之 Modifier初识
征服 Mongodb 之 Modifier增强
征服 Mongodb 之 CRUD
关于如何安装、配置、启动MongoDB等，参考上篇文章。
一、常规命令
- 登录
类似于MySQL登录，可参考如下命令：
# mongo --help MongoDB shell version: 2.0.7 usage: mongo [options] [db address] [file names (ending in .js)] db address can be: foo foo database on local machine 192.169.0.5/foo foo database on 192.168.0.5 machine 192.169.0.5:9999/foo foo database on 192.168.0.5 machine on port 9999 options: --shell run the shell after executing files --nodb don't connect to mongod on startup - no 'db address' arg expected --norc will not run the ".mongorc.js" file on start up --quiet be less chatty --port arg port to connect to --host arg server to connect to --eval arg evaluate javascript -u [ --username ] arg username for authentication -p [ --password ] arg password for authentication -h [ --help ] show this usage information --version show version information --verbose increase verbosity --ipv6 enable IPv6 support (disabled by default) file names: a list of files to run. files have to end in .js and will exit after unless --shell is specified
譬如，我经常这么用，一步到位：
# mongo 10.11.20.140/zlex MongoDB shell version: 2.0.7 connecting to: 10.11.20.140/zlex >
- 查看当前数据库/切换数据库
# mongo MongoDB shell version: 2.0.7 connecting to: test > db test > use zlex switched to db zlex >
- 查看当前数据库下的表，及索引
> show collections system.indexes test usersystem.indexes索引信息
test、user是数据表
- 查看当前数据库、表状态
> db.stats()
{
"db" : "test",
"collections" : 6,
"objects" : 16,
"avgObjSize" : 44.75,
"dataSize" : 716,
"storageSize" : 32768,
"numExtents" : 6,
"indexes" : 4,
"indexSize" : 32704,
"fileSize" : 201326592,
"nsSizeMB" : 16,
"ok" : 1
}
> db.blog.stats()
{
"ns" : "test.blog",
"count" : 0,
"size" : 0,
"storageSize" : 8192,
"numExtents" : 1,
"nindexes" : 1,
"lastExtentSize" : 8192,
"paddingFactor" : 1.56,
"flags" : 1,
"totalIndexSize" : 8176,
"indexSizes" : {
"_id_" : 8176
},
"ok" : 1
} PS：MongoDB 1.8支持16MB的消息长度
- 一些边边角角的函数，你懂滴，横向思维下
> db.help()
DB methods:
db.addUser(username, password[, readOnly=false])
db.auth(username, password)
db.cloneDatabase(fromhost)
db.commandHelp(name) returns the help for the command
db.copyDatabase(fromdb, todb, fromhost)
db.createCollection(name, { size : ..., capped : ..., max : ... } )
db.currentOp() displays the current operation in the db
db.dropDatabase()
db.eval(func, args) run code server-side
db.getCollection(cname) same as db['cname'] or db.cname
db.getCollectionNames()
db.getLastError() - just returns the err msg string
db.getLastErrorObj() - return full status object
db.getMongo() get the server connection object
db.getMongo().setSlaveOk() allow this connection to read from the nonmaster member of a replica pair
db.getName()
db.getPrevError()
db.getProfilingLevel() - deprecated
db.getProfilingStatus() - returns if profiling is on and slow threshold
db.getReplicationInfo()
db.getSiblingDB(name) get the db at the same server as this one
db.isMaster() check replica primary status
db.killOp(opid) kills the current operation in the db
db.listCommands() lists all the db commands
db.logout()
db.printCollectionStats()
db.printReplicationInfo()
db.printSlaveReplicationInfo()
db.printShardingStatus()
db.removeUser(username)
db.repairDatabase()
db.resetError()
db.runCommand(cmdObj) run a database command. if cmdObj is a string, turns it into { cmdObj : 1 }
db.serverStatus()
db.setProfilingLevel(level,) 0=off 1=slow 2=all
db.shutdownServer()
db.stats()
db.version() current version of the server
db.getMongo().setSlaveOk() allow queries on a replication slave server
db.fsyncLock() flush data to disk and lock server for backups
db.fsyncUnock() unlocks server following a db.fsyncLock()
>
