lockInfo（数据库命令）

定义

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

兼容性

此命令可用于以下环境中托管的部署：

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

重要

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

MongoDB Enterprise：基于订阅、自我管理的 MongoDB 版本
MongoDB Community：源代码可用、免费使用且可自行管理的 MongoDB 版本

语法

该命令具有以下语法：

db.adminCommand(
   {
     lockInfo: 1
   }
)

输出示例

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
}

输出字段

lockInfo

报告锁定信息的一组文档。每个文档包括：

resourceId
granted
pending

lockInfo.resourceId: 正在加锁或等待加锁的资源。

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.

锁信息

For each granted or pending lock document, information include:

字段	说明
`mode`	指定锁模式： `S`: 共享 `X`: 独占 `IS`: 意向共享 `IX`: 意向独占 (IX)
`convertMode`	指定用于转换的新锁定模式。
`enqueueAtFront`	一个布尔值，指示在发生冲突时是将锁放在队列的前面还是后面。
`compatibleFirst`	布尔值，表示根据与已授权锁的兼容性授予锁请求，或使用先进先出 (FIFO) 顺序。
`debugInfo`	有关发出锁请求的操作的信息。
`clientInfo`	详细说明客户信息的文档。