# 查看集群设置
## List Databases with Sharding Enabled 具备分片功能的列表数据库
To list the databases that have sharding enabled, query the databases collection in the [Config Database](https://docs.mongodb.com/manual/reference/config-database/#std-label-config-database).
查询配置数据库中的数据库集合，可以显示具有分片功能的数据库列表
A database has sharding enabled if the value of the partitioned field is true.
如果分区字段的值为真，则数据库具有分片功能。
Connect to a [mongos](https://docs.mongodb.com/manual/reference/program/mongos/#mongodb-binary-bin.mongos) instance with a [mongo](https://docs.mongodb.com/manual/reference/program/mongo/#mongodb-binary-bin.mongo) shell, and run the following operation to get a full list of databases with sharding enabled:
使用mongo shell连接一个mongos实例，运行以下操作以获取一个完整的具备分片功能的数据库列表：
```
use config
db.databases.find( { "partitioned": true } )
```
**EXAMPLE 实例**
You can use the following sequence of commands to return a list of all databases in the cluster:
可以使用如下命令行返回集群中的所有数据库列表：
```
use config
db.databases.find()
```
If this returns the following result set:
如果上述命令返回如下结果集：
```
{ "_id" : "test", "primary" : "shardB", "partitioned" : false }
{ "_id" : "animals", "primary" : "shardA", "partitioned" : true }
{ "_id" : "farms", "primary" : "shardA", "partitioned" : false }
```
Then sharding is only enabled for the animals database.
那么只有 animals数据库可以分片。
## List Shards
To list the current set of configured shards, use the [listShards](https://docs.mongodb.com/manual/reference/command/listShards/#mongodb-dbcommand-dbcmd.listShards) command, as follows:
使用如下的[listShards](https://docs.mongodb.com/manual/reference/command/listShards/#mongodb-dbcommand-dbcmd.listShards) 命令，列出当前配置分片的集合：
```
db.adminCommand( { listShards : 1 } )
```
## View Cluster Details 查看集群细节
To view cluster details, issue [db.printShardingStatus()](https://docs.mongodb.com/manual/reference/method/db.printShardingStatus/#mongodb-method-db.printShardingStatus) or [sh.status()](https://docs.mongodb.com/manual/reference/method/sh.status/#mongodb-method-sh.status). Both methods return the same output.
使用[db.printShardingStatus()](https://docs.mongodb.com/manual/reference/method/db.printShardingStatus/#mongodb-method-db.printShardingStatus)或者 [sh.status()](https://docs.mongodb.com/manual/reference/method/sh.status/#mongodb-method-sh.status)可以查看集群细节。两种命令会返回同样的结果。
**EXAMPLE**
**例子**
**In the following example output from sh.status()**
**以下的例子，输出结果来自sh.status()**
* sharding version displays the version number of the shard metadata.
* sharding version 显示分片元数据的版本数
* shards displays a list of the [mongod](https://docs.mongodb.com/manual/reference/program/mongod/#mongodb-binary-bin.mongod) instances used as shards in the cluster.
* shards 显示[mongod](https://docs.mongodb.com/manual/reference/program/mongod/#mongodb-binary-bin.mongod)实例的列表，用于集群中的分片。
* databases displays all databases in the cluster, including database that do not have sharding enabled.
* databases 显示集群中的所有数据库，包括无法分片的数据库。
* The chunks information for the foo database displays how many chunks are on each shard and displays the range of each chunk.
* 用于foo数据库的chunks 信息，显示每个分片上有多少chunks（分区），并显示每个chunk的范围。
```
--- Sharding Status ---
sharding version: {
"_id" : 1,
"minCompatibleVersion" : 5,
"currentVersion" : 6,
"clusterId" : ObjectId("59a4443c3d38cd8a0b40316d")
}
shards:
{ "_id" : "shard0000", "host" : "m0.example.net:27018" }
{ "_id" : "shard0001", "host" : "m3.example2.net:27018" }
{ "_id" : "shard0002", "host" : "m2.example.net:27018" }
active mongoses:
"3.4.7" : 1
autosplit:
Currently enabled: yes
balancer:
Currently enabled: yes
Currently running: no
Failed balancer rounds in last 5 attempts: 0
Migration Results for the last 24 hours:
1 : Success
databases:
{ "_id" : "foo", "partitioned" : true, "primary" : "shard0000" }
foo.contacts
shard key: { "zip" : 1 }
unique: false
balancing: true
chunks:
shard0001 2
shard0002 3
shard0000 2
{ "zip" : { "$minKey" : 1 } } -->> { "zip" : "56000" } on : shard0001 { "t" : 2, "i" : 0 }
{ "zip" : 56000 } -->> { "zip" : "56800" } on : shard0002 { "t" : 3, "i" : 4 }
{ "zip" : 56800 } -->> { "zip" : "57088" } on : shard0002 { "t" : 4, "i" : 2 }
{ "zip" : 57088 } -->> { "zip" : "57500" } on : shard0002 { "t" : 4, "i" : 3 }
{ "zip" : 57500 } -->> { "zip" : "58140" } on : shard0001 { "t" : 4, "i" : 0 }
{ "zip" : 58140 } -->> { "zip" : "59000" } on : shard0000 { "t" : 4, "i" : 1 }
{ "zip" : 59000 } -->> { "zip" : { "$maxKey" : 1 } } on : shard0000 { "t" : 3, "i" : 3 }
{ "_id" : "test", "partitioned" : false, "primary" : "shard0000" }
```
原文链接：
译者：张冲
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