Mongodb 学习手稿

1:升序;-1:降序

db.user.ensureIndex({name:1},{options}) //Deprecated

db.user.createIndex({name:1},{options}) //options: background:true;unique:true

db.user.getIndexes()

db.user.dropIndex("index_name")

db.user.dropIndexes()

--master

--slave --source <master:port>

如果不指定source,可以登录slave,然后

db.sources.insert({host:"<master:port>"})

db.sources.find();

效果同source参数

----ReplSet

config={_id:"",members:[{_id:"",host:""}....]}

rs.initiate(config)

rs.reconfig(config,{force:true}) {force:true}可选，可能导致数据回滚, 执行命令时，必须连接一个Primary节点；

添加replset时，只需在Primary中执行：rs.add(host:port);

rs.slaveOk() 在secondary中执行操作；

rs.addArb(host:port) 添加仲裁者;决策哪台服务器是Primary,哪台是Secondary, 默认情况下mongodb会自动分配，可当如果是2个的话，就无法决策。

db.user.find({<condition>},{<field:0?1>}) //0:不显示，1：显示

=======================================================================

数据聚合：

db.user.aggregation({})

http://docs.mongodb.org/manual/reference/sql-aggregation-comparison/

WHERE $match

GROUP BY$group

HAVING $match

SELECT $project

ORDER BY$sort

LIMIT $limit

SUM() $sum

COUNT() $sum

db.runCommand({

mapReduce:<collection>,

map:function,

finialize:function,

query:document,

sort:documnt,

limit:number,

scope:document

.....

})

http://docs.mongodb.org/manual/reference/command/mapReduce/

db.user.find({field:{$exists:true}}) //查询只有field的数据,false相反

============================================================================

存储过程

mongodb的存储过程在db.system.js

db.system.js.insert({_id:"<produceName>",value:<function(params){}>})

db.eval('<productName(params)>')

=============================================================================

导入导出

mongoexport -d <database> -c <collections> -o <filename> --csv -f <field> -h <host> -p <port> -u <user>

mongoimport -d <database> -c <collections> -o <filename> --type csv --headerline

mongodump -d <database> -o <filepath>

mongorestore -d <database> -c <collections> dumpfilepath

========================================================

监控

db.currentOp()

db.killOp(<pid>)

===========================================

db.createCollection("name",{capped:true,size:10000})

=====================================================================================

mkdir /data/test/config/data -p

mkdir /data/test/shard1/data -p

mkdir /data/test/shard2/data -p

mkdir /data/test/shard3/data -p

mkdir /data/test/config/log -p

mkdir /data/test/shard1/log -p

mkdir /data/test/shard2/log -p

mkdir /data/test/shard3/log -p

mkdir /data/test/mongos/log -p

---Config-----

mongod --configsvr --dbpath /data/test/config/data/ --port 21000 --logpath /data/test/config/log/config.log --fork

---Mongos-----

mongos --configdb 192.168.137.128:21000,192.168.137.129:21000,192.168.137.130:21000 --port 20000 --logpath /data/test/mongos/log/mongos.log --fork

mongod --shardsvr --replSet shard3 --port 22003 --dbpath /data/test/shard3/data/ --logpath /data/test/shard3/log/shard1.log --fork --oplogSize 10 --nojournal

mongod --shardsvr --replSet shard1 --port 22001 --dbpath /data/test/shard1/data/ --logpath /data/test/shard1/log/shard1.log --fork --oplogSize 10 --nojournal

mongod --shardsvr --replSet shard2 --port 22002 --dbpath /data/test/shard2/data/ --logpath /data/test/shard2/log/shard1.log --fork --oplogSize 10 --nojournal

---Replset------

mongos --port 22001

use admin

config={_id:shard1,members:[{_id:0,host:"shard1/192.168.137.128:22001,192.168.137.139:22001,192.168.137.130:22001"}]}

rs.initiate(config)

mongos --port 22002

use admin

config={_id:shard2,members:[{_id:1,host:"shard2/192.168.137.128:22002,192.168.137.139:22002,192.168.137.130:22002"}]}

rs.initiate(config)

mongos --port 22003

use admin

config={_id:shard3,members:[{_id:2,host:"shard3/192.168.137.128:22003,192.168.137.139:22003,192.168.137.130:22003"}]}

rs.initiate(config)

--------Shard-----

mongo --port 20000

use admin

db.runnCommand({addshard:"shard1/192.168.137.128:22001,192.168.137.129:22001,192.168.137.130:22001"})

db.runnCommand({addshard:"shard2/192.168.137.128:22002,192.168.137.129:22002,192.168.137.130:22002"})

db.runnCommand({addshard:"shard3/192.168.137.128:22003,192.168.137.129:22003,192.168.137.130:22003"})

db.runCommand({removeshard:"127.0.0.1:22001"})

db.runCommand({enablesharding:"testdb"}) //开启分片功能

db.runCommand({shardcollection:"testdb.user",key:{id:1}}) //指定分片的Key

db.printShardingStatus()

db.getName() //当前数据库名称

db.hostInfo() //系统信息

db.isMaster() //判断是否Master

db.runCommand({flushRouterConfig:1}) //清除mongos缓存的集群信息，重新加载configdb的集群信息；

isdbgrid:1 //判断当前链接的是不是mongos;如果不是会提示错误信息；

db.user.find().pretty(); //pretty(),将结果格式化输出

=====================================================================================

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