View Cluster Configuration查看群集配置

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List Databases with Sharding Enabled列出启用了分片的数据库

To list the databases that have sharding enabled, query the databases collection in the Config Database. 要列出已启用分片的数据库，请查询config数据库中的databases集合。A database has sharding enabled if the value of the partitioned field is true. 如果partitioned字段的值为true，则数据库已启用分片。Connect mongosh to a mongos instance and run the following operation to get a full list of databases with sharding enabled:将mongosh连接到mongos实例并运行以下操作，以获取启用了分片的数据库的完整列表：

use config
db.databases.find( { "partitioned": true } )
Example示例

You can use the following sequence of commands to return a list of all databases in the cluster:可以使用以下命令序列返回群集中所有数据库的列表：

use config
db.databases.find()

If this returns the following result set:如果返回以下结果集：

{ "_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.然后仅对animals数据库启用分片。

List Shards列出分片

To list the current set of configured shards, use the listShards command, as follows:要列出当前配置的分片集，请使用listShards命令，如下所示：

db.adminCommand( { listShards : 1 } )

View Cluster Details查看群集详细信息

To view cluster details, issue db.printShardingStatus() or sh.status(). 要查看集群详细信息，请发出db.printShardingStatus()或sh.status()。Both methods return the same output.这两种方法都返回相同的输出。

Example示例
In the following example output from sh.status()在下面的sh.status()输出示例中
  • sharding version displays the version number of the shard metadata.显示分片元数据的版本号。
  • shards displays a list of the mongod instances used as shards in the cluster.显示集群中用作分片的mongod实例的列表。
  • databases displays all databases in the cluster, including database that do not have sharding enabled.显示群集中的所有数据库，包括未启用分片的数据库。
  • The chunks information for the foo database displays how many chunks are on each shard and displays the range of each chunk.foo数据库的chunks信息显示每个分片上有多少块，并显示每个块的范围。
--- 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" }
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