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Update MongoDB_分片.md

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@ -290,7 +290,7 @@ db.runCommand({ addshard : "rs1/hadoop001:37018,hadoop002:37018,hadoop003:37018"
#### 1. 开启分片功能
连接到 mongos ，对 testdb 数据库开启分片功能，同时设置集合 users 的分片键为用户 id，后面的`1`表示范围分片，如果想要采用哈希分片，则对应的写法为： `{uid:"hashed"}` 。
连接到 mongos ，对 testdb 数据库开启分片功能，同时设置集合 users 的分片键为用户 id，后面的 `1` 表示范围分片，如果想要采用哈希分片，则对应的写法为： `{uid:"hashed"}` 。
```shell
db.runCommand({ enablesharding : "testdb" })