在完成了MongoDB集群的搭建工作之后(见 http://www.linuxidc.com/Linux/2012-01/50773.htm)，需要做的就是建立一个数据库，建立表，设置分片主键来初始化数据了！

(1)建立WLB数据库，设置分表wlb_orders

D:/mongodb-win32-i386-1.8.0/cmd>cd d:/mongodb-win32-i386-1.8.0/bin

D:/mongodb-win32-i386-1.8.0/bin>call mongo.exe 127.0.0.1:50000

MongoDB shell version: 1.8.0

connecting to: 127.0.0.1:50000/test

> use adminswitched to db admin

> printShardingStatus()--- Sharding Status ---

sharding version: { "_id" : 1, "version" : 3 }

shards:

{

"_id" : "ShardSetA",

"host" : "setA/127.0.0.1:10000,127.0.0.1:10001,127.0.0.1:10002"

}

{

"_id" : "ShardSetB",

"host" : "setB/127.0.0.1:20000,127.0.0.1:20001,127.0.0.1:20002"

}

{

"_id" : "ShardSetC",

"host" : "setC/127.0.0.1:30000,127.0.0.1:30001,127.0.0.1:30002"

}

databases:

{ "_id" : "admin", "partitioned" : false, "primary" : "config" }

> use wlb //在wlb数据库不存在的情况下，就会新建一个数据库switched to db wlb

> db.createCollection('wlb_orders') //创建一个表wlb_orders{ "ok" : 1 }

> use admin

switched to db admin

> db.runCommand({enablesharding:'wlb'}) //设置数据库可以分片{ "ok" : 1 }

> db.runCommand({shardcollection:'wlb.wlb_orders',key:{order_id:1}})  //设置表的分区主键为order_id{ "collectionsharded" : "wlb.wlb_orders", "ok" : 1 }

>db.printShardingStatus() //查询数据库分片信息--- Sharding Status ---

sharding version: { "_id" : 1, "version" : 3 }

shards:

{

"_id" : "ShardSetA",

"host" : "setA/127.0.0.1:10000,127.0.0.1:10001,127.0.0.1:10002"

}

{

"_id" : "ShardSetB",

"host" : "setB/127.0.0.1:20000,127.0.0.1:20001,127.0.0.1:20002"

}

{

"_id" : "ShardSetC",

"host" : "setC/127.0.0.1:30000,127.0.0.1:30001,127.0.0.1:30002"

}

databases:

{ "_id" : "admin", "partitioned" : false, "primary" : "config" }

{ "_id" : "wlb", "partitioned" : true, "primary" : "ShardSetA" }

wlb.wlb_orders chunks:

ShardSetA       1

{ "order_id" : { $minKey : 1 } } -->> { "order_id" : { $maxKey : 1 } } on : ShardSetA { "t" : 1000, "i" : 0 }

>