lockInfo (comando de banco de dados)

Definição

lockInfo: Returns information on locks that are currently being held or pending. lockInfo is an internal command available on mongod instances only.

Compatibilidade

Esse comando está disponível em implantações hospedadas nos seguintes ambientes:

MongoDB Atlas: The fully managed service for MongoDB deployments in the cloud

Importante

This command is not supported in M0 and Flex clusters. For more information, see Unsupported Commands.

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.adminCommand(
   {
     lockInfo: 1
   }
)

Exemplo de saída

The following is an example of the output from the lockInfo:

{
   "lockInfo" : [
      {
         "resourceId" : "{2305843009213693953: ParallelBatchWriterMode, 1}",
         "granted" : [
            {
               "mode" : "IS",
               "convertMode" : "NONE",
               "enqueueAtFront" : false,
               "compatibleFirst" : false,
               "debugInfo" : "{ findandmodify: \"hugeindex\", query: { _id: 585.0 }, update: { $pop: { a: 1.0 } }, upsert: false, new: false, lsid: { id: UUID(\"dc611138-04c6-49b1-a7ac-161040dd9d65\") }, $db: \"test\" }",
               "clientInfo" : {
                  "desc" : "conn3",
                  "connectionId" : 3,
                  "client" : "127.0.0.1:55165",
                  "opid" : 28770
               }
            }
         ],
         "pending" : [ ]
      },
      {
         "resourceId" : "{6917529027641081857: Global, 1}",
         "granted" : [
            {
               "mode" : "IX",
               "convertMode" : "NONE",
               "enqueueAtFront" : false,
               "compatibleFirst" : false,
               "debugInfo" : "{ findandmodify: \"hugeindex\", query: { _id: 585.0 }, update: { $pop: { a: 1.0 } }, upsert: false, new: false, lsid: { id: UUID(\"dc611138-04c6-49b1-a7ac-161040dd9d65\") }, $db: \"test\" }",
               "clientInfo" : {
                  "desc" : "conn3",
                  "connectionId" : 3,
                  "client" : "127.0.0.1:55165",
                  "opid" : 28770
               }
            },
            {
               "mode" : "IX",
               "convertMode" : "NONE",
               "enqueueAtFront" : false,
               "compatibleFirst" : false,
               "debugInfo" : "index build: 29d48366-63ad-41e2-a689-69255a89c094",
               "clientInfo" : {
                  "desc" : "IndexBuildsCoordinatorMongod-0",
                  "opid" : 27437
               }
            }
         ],
         "pending" : [ ]
      },
      {
         "resourceId" : "{4611686018427387905: ReplicationStateTransition, 1}",
         "granted" : [
            {
               "mode" : "IX",
               "convertMode" : "NONE",
               "enqueueAtFront" : false,
               "compatibleFirst" : false,
               "debugInfo" : "{ findandmodify: \"hugeindex\", query: { _id: 585.0 }, update: { $pop: { a: 1.0 } }, upsert: false, new: false, lsid: { id: UUID(\"dc611138-04c6-49b1-a7ac-161040dd9d65\") }, $db: \"test\" }",
               "clientInfo" : {
                  "desc" : "conn3",
                  "connectionId" : 3,
                  "client" : "127.0.0.1:55165",
                  "opid" : 28770
               }
            },
            {
               "mode" : "IX",
               "convertMode" : "NONE",
               "enqueueAtFront" : false,
               "compatibleFirst" : false,
               "debugInfo" : "index build: 29d48366-63ad-41e2-a689-69255a89c094",
               "clientInfo" : {
                  "desc" : "IndexBuildsCoordinatorMongod-0",
                  "opid" : 27437
               }
            }
         ],
         "pending" : [ ]
      },
      {
         "resourceId" : "{10123292395995783581: Database, 899920359141007773, test}",
         "granted" : [
            {
               "mode" : "IX",
               "convertMode" : "NONE",
               "enqueueAtFront" : false,
               "compatibleFirst" : false,
               "debugInfo" : "{ findandmodify: \"hugeindex\", query: { _id: 585.0 }, update: { $pop: { a: 1.0 } }, upsert: false, new: false, lsid: { id: UUID(\"dc611138-04c6-49b1-a7ac-161040dd9d65\") }, $db: \"test\" }",
               "clientInfo" : {
                  "desc" : "conn3",
                  "connectionId" : 3,
                  "client" : "127.0.0.1:55165",
                  "opid" : 28770
               }
            },
            {
               "mode" : "IX",
               "convertMode" : "NONE",
               "enqueueAtFront" : false,
               "compatibleFirst" : false,
               "debugInfo" : "index build: 29d48366-63ad-41e2-a689-69255a89c094",
               "clientInfo" : {
                  "desc" : "IndexBuildsCoordinatorMongod-0",
                  "opid" : 27437
               }
            }
         ],
         "pending" : [ ]
      },
      {
         "resourceId" : "{12576221391967629173: Collection, 1047006345899159413, test.hugeindex}",
         "granted" : [
            {
               "mode" : "IX",
               "convertMode" : "NONE",
               "enqueueAtFront" : false,
               "compatibleFirst" : false,
               "debugInfo" : "{ findandmodify: \"hugeindex\", query: { _id: 585.0 }, update: { $pop: { a: 1.0 } }, upsert: false, new: false, lsid: { id: UUID(\"dc611138-04c6-49b1-a7ac-161040dd9d65\") }, $db: \"test\" }",
               "clientInfo" : {
                  "desc" : "conn3",
                  "connectionId" : 3,
                  "client" : "127.0.0.1:55165",
                  "opid" : 28770
               }
            },
            {
               "mode" : "IX",
               "convertMode" : "NONE",
               "enqueueAtFront" : false,
               "compatibleFirst" : false,
               "debugInfo" : "index build: 29d48366-63ad-41e2-a689-69255a89c094",
               "clientInfo" : {
                  "desc" : "IndexBuildsCoordinatorMongod-0",
                  "opid" : 27437
               }
            }
         ],
         "pending" : [ ]
      }
   ],
   "ok" : 1
}

Campos de Saída

lockInfo

Um array de documentos que relatam as informações da trava. Cada documento inclui:

resourceId
granted
pending

lockInfo.resourceId: O recurso no qual as travas estão retidas ou pendentes.

lockInfo.granted: An array of documents. Each document provides information on locks that are currently granted on the resource.

lockInfo.pending: An array of documents. Each document provides information on locks that are currently pending on the resource.

Travar informações

For each granted or pending lock document, information include:

Campo	Descrição
`mode`	Especifica o modo da trava: `S`: Compartilhado `X`: Exclusivo `IS`: Intenção compartilhada `IX`: Intenção exclusiva (IX)
`convertMode`	Especifica o novo modo da trava para conversão.
`enqueueAtFront`	Um booleano que indica se o bloqueio deve ser colocado na frente ou atrás da fila em caso de conflito.
`compatibleFirst`	Um booleano que indica conceder solicitações de trava com base na compatibilidade com travas já concedidas ou para usar a ordem primeiro a entrar, primeiro a sair (FIFO).
`debugInfo`	Informações sobre a operação que emitiu a solicitação de trava.
`clientInfo`	Um documento detalhando as informações do cliente.

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