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Definição

listShards

The listShards command returns a list of the configured shards in a sharded cluster. listShards is only available on mongos instances and must be issued against the admin database.

Compatibilidade

Esse comando está disponível em implantações hospedadas nos seguintes ambientes:

• MongoDB Atlas: o serviço totalmente gerenciado para implantações do MongoDB na nuvem

• MongoDB Enterprise: a versão autogerenciada e baseada em assinatura do MongoDB

• MongoDB Community: uma versão com código disponível, de uso gratuito e autogerenciada do MongoDB

Sintaxe

O comando tem a seguinte sintaxe:

db.runCommand(
  {
    listShards: 1
  }
)

Exemplo

The following operation runs listShards against the mongos admin database:

db.adminCommand({ listShards: 1 })

The following document is an example of the output from a listShards command:

{
  "shards": [
    {
      "_id": "shard01",
      "host": "shard01/host1:27018,host2:27018,host3:27018",
      "state": 1
    },
    {
      "_id": "shard02",
      "host": "shard02/host4:27018,host5:27018,host6:27018",
      "tags": [ "NYC" ],
      "state": 1
    },
    {
      "_id": "shard03",
      "host": "shard03/host7:27018,host8:27018,host9:27018",
      "state": 1
    }
  ],
  "ok": 1,
  "$clusterTime" : {
     "clusterTime" : Timestamp(1510716515, 1),
     "signature" : {
        "hash" : BinData(0,"B2ViX7XLzFLS5Fl9XEuFXbwKIM4="),
        "keyId" : NumberLong("6488045157173166092")
     }
  },
  "operationTime" : Timestamp(1510716515, 1)
}

Saída

listShards returns a document that includes:

• uma shards field which contains an array of documents, each describing one shard. Each document may contain the following fields:

  Campo	Descrição
  _id	The name of the shard.
  host	The hostname of the shard. If the shard is a replica set, host lists the hostname of each mongod instance in the replica set.
  draining	If true, indicates that removeShard has been called for this shard and it is in the process of being drained.
  tags	A list of zones to which the shard belongs.
  state	An internal field used during the addShard sequence to ensure that all steps and configuration necessary to add the shard to the cluster are completed.

• The ok status field, the operationTime field, and the $clusterTime field for the operation. For details on these fields, see Resposta.