db.currentOp()
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Definition
db.currentOp()Returns a document that contains information on in-progress operations for the database instance. The
db.currentOp()method wraps the database commandcurrentOp.Use the
$currentOpaggregation stage instead of thecurrentOpcommand and itsmongoshhelper methoddb.currentOp().Note
Starting in MongoDB 5.0, the
$currentOpaggregation stage is used when running the helper methoddb.currentOp()withmongosh.Given this, in the 5.0 version of the shell and with mongosh,
db.currentOp()result sets are not subject to the 16MB BSON document return size document return size limit for documents of the previous legacymongoversions.
Compatibility
This method is available in deployments hosted in the following environments:
MongoDB Atlas: The fully managed service for MongoDB deployments in the cloud
Important
This command is not supported in M0, M2, and M5 clusters. For more information, see Unsupported Commands.
MongoDB Enterprise: The subscription-based, self-managed version of MongoDB
MongoDB Community: The source-available, free-to-use, and self-managed version of MongoDB
Syntax
db.currentOp() has the following form:
db.currentOp(<operations>)
db.currentOp() can take the following optional
argument:
Parameter | Type | Description |
|---|---|---|
boolean or document | Optional. Specifies the operations to report on. Can pass either a boolean or a document:
|
Behavior
db.currentOp() can accept a filter document or a boolean
parameter.
If you pass a filter document to db.currentOp(), the output
returns information only for the current operations that match the
filter. The filter document can contain:
Field | Description |
|---|---|
"$ownOps" | Boolean. If set to On |
"$all" | Boolean. If set to If the document includes |
<filter> | Specify filter conditions on the Output Fields. See Examples. If the document includes |
Passing in true to db.currentOp() is equivalent to
passing in a document of { "$all": true }. The following operations
are equivalent:
db.currentOp(true) db.currentOp( { "$all": true } )
db.currentOp() and the
database profiler report the same
basic diagnostic information for all CRUD operations, including the
following:
getMore(OP_GET_MORE andcommand)
These operations are also included in the logging of
slow queries. See slowOpThresholdMs for
more information about slow query logging.
Access Control
On systems running with authorization, the user
must have access that includes the inprog privilege
action.
Users can run db.currentOp( { "$ownOps": true }
) on mongod instances to view their own operations
even without the inprog privilege action.
Examples
The following examples use the db.currentOp() method with
various query documents to filter the output.
Write Operations Waiting for a Lock
The following example returns information on all write operations that are waiting for a lock:
db.currentOp( { "waitingForLock" : true, $or: [ { "op" : { "$in" : [ "insert", "update", "remove" ] } }, { "command.findandmodify": { $exists: true } } ] } )
Active Operations with no Yields
The following example returns information on all active running operations that have never yielded:
db.currentOp( { "active" : true, "numYields" : 0, "waitingForLock" : false } )
Active Operations on a Specific Database
The following example returns information on all active operations for
database db1 that have been running longer than 3 seconds:
db.currentOp( { "active" : true, "secs_running" : { "$gt" : 3 }, "ns" : /^db1\./ } )
Active Indexing Operations
The following example returns information on index creation operations on any number of fields:
db.adminCommand( { currentOp: true, $or: [ { op: "command", "command.createIndexes": { $exists: true } }, { op: "command", "command.$truncated": /^\{ createIndexes/ }, { op: "none", "msg" : /^Index Build/ } ] } )
Output Example
The following is a prototype of db.currentOp() output.
The following is a prototype of the currentOp
output when run on a standalone:
{ "inprog": [ { "type" : <string>, "host" : <string>, "desc" : <string>, "connectionId" : <number>, "client" : <string>, "appName" : <string>, "clientMetadata" : <document>, "active" : <boolean>, "currentOpTime" : <string>, "effectiveUsers" : [ { "user" : <string>, "db" : <string> } ], "opid" : <number>, "lsid" : { "id" : <UUID>, "uid" : <BinData> }, "secs_running" : <NumberLong()>, "microsecs_running" : <number>, "op" : <string>, "ns" : <string>, "command" : <document>, "queryFramework" : <string>, "planSummary": <string>, "cursor" : { // only for getMore operations "cursorId" : <NumberLong()>, "createdDate" : <ISODate()>, "lastAccessDate" : <ISODate()>, "nDocsReturned" : <NumberLong()>, "nBatchesReturned" : <NumberLong()>, "noCursorTimeout" : <boolean>, "tailable" : <boolean>, "awaitData" : <boolean>, "originatingCommand" : <document>, "planSummary" : <string>, "operationUsingCursorId" : <NumberLong()> }, "msg": <string>, "progress" : { "done" : <number>, "total" : <number> }, "killPending" : <boolean>, "numYields" : <number>, "dataThroughputLastSecond" : <number>, "dataThroughputAverage" : <number>, "locks" : { "ParallelBatchWriterMode" : <string>, "ReplicationStateTransition" : <string>, "Global" : <string>, "Database" : <string>, "Collection" : <string>, "Metadata" : <string>, "oplog" : <string> }, "waitingForLock" : <boolean>, "lockStats" : { "ParallelBatchWriterMode" : { "acquireCount": { "r": <NumberLong>, "w": <NumberLong>, "R": <NumberLong>, "W": <NumberLong> }, "acquireWaitCount": { "r": <NumberLong>, "w": <NumberLong>, "R": <NumberLong>, "W": <NumberLong> }, "timeAcquiringMicros" : { "r" : NumberLong(0), "w" : NumberLong(0), "R" : NumberLong(0), "W" : NumberLong(0) }, "deadlockCount" : { "r" : NumberLong(0), "w" : NumberLong(0), "R" : NumberLong(0), "W" : NumberLong(0) } }, "ReplicationStateTransition" : { ... }, "Global": { ... }, "Database" : { ... }, ... } }, ... ], "fsyncLock": <boolean>, "info": <string>, "ok": <num> }
The following is a prototype of the currentOp
output when run on a primary of a replica set:
{ "inprog": [ { "type" : <string>, "host" : <string>, "desc" : <string>, "connectionId" : <number>, "client" : <string>, "appName" : <string>, "clientMetadata" : <document>, "lsid" : { "id" : <UUID>, "uid" : <BinData> }, "transaction" : { "parameters" : { "txnNumber" : <NumberLong()>, "autocommit" : <boolean>, "readConcern" : { "level" : <string> } }, "readTimestamp" : <Timestamp>, "startWallClockTime" : <string>, "timeOpenMicros" : <NumberLong()>, "timeActiveMicros" : <NumberLong()>, "timeInactiveMicros" : <NumberLong()>, "expiryTime" : <string>, }, "active" : <boolean>, "currentOpTime" : <string>, "effectiveUsers" : [ { "user" : <string>, "db" : <string> } ], "opid" : <number>, "secs_running" : <NumberLong()>, "microsecs_running" : <number>, "op" : <string>, "ns" : <string>, "command" : <document>, "originatingCommand" : <document>, "queryFramework" : <string>, "planSummary": <string>, "prepareReadConflicts" : <NumberLong()>, "writeConflicts" : <NumberLong()>, "cursor" : { // only for getMore operations "cursorId" : <NumberLong()>, "createdDate" : <ISODate()>, "lastAccessDate" : <ISODate()>, "nDocsReturned" : <NumberLong()>, "nBatchesReturned" : <NumberLong()>, "noCursorTimeout" : <boolean>, "tailable" : <boolean>, "awaitData" : <boolean>, "originatingCommand" : <document>, "planSummary" : <string>, "operationUsingCursorId" : <NumberLong()> }, "msg": <string>, "progress" : { "done" : <number>, "total" : <number> }, "killPending" : <boolean>, "numYields" : <number>, "dataThroughputLastSecond" : <number>, "dataThroughputAverage" : <number>, "locks" : { "ParallelBatchWriterMode" : <string>, "ReplicationStateTransition" : <string>, "Global" : <string>, "Database" : <string>, "Collection" : <string>, "Metadata" : <string>, "oplog" : <string> }, "waitingForLock" : <boolean>, "lockStats" : { "ParallelBatchWriterMode" : { "acquireCount": { "r": <NumberLong>, "w": <NumberLong>, "R": <NumberLong>, "W": <NumberLong> }, "acquireWaitCount": { "r": <NumberLong>, "w": <NumberLong>, "R": <NumberLong>, "W": <NumberLong> }, "timeAcquiringMicros" : { "r" : NumberLong(0), "w" : NumberLong(0), "R" : NumberLong(0), "W" : NumberLong(0) }, "deadlockCount" : { "r" : NumberLong(0), "w" : NumberLong(0), "R" : NumberLong(0), "W" : NumberLong(0) } }, "ReplicationStateTransition" : { ... }, "Global" : { ... }, "Database" : { ... }, ... } }, ... ], "fsyncLock": <boolean>, "info": <string>, "ok": <num>, "operationTime": <timestamp>, "$clusterTime": <document> }
The following is an example of the currentOp
output when run on a mongos of a sharded
cluster (Fields may vary depending on the operation being
reported):
{ "inprog": [ { "shard": <string>, "type" : <string>, "host" : <string>, "desc" : <string>, "connectionId" : <number>, "client_s" : <string>, "appName" : <string>, "clientMetadata" : <document>, "lsid" : { "id" : <UUID>, "uid" : <BinData> }, "transaction" : { "parameters" : { "txnNumber" : <NumberLong()>, "autocommit" : <boolean>, "readConcern" : { "level" : <string> } }, "readTimestamp" : <Timestamp>, "startWallClockTime" : <string>, "timeOpenMicros" : <NumberLong()>, "timeActiveMicros" : <NumberLong()>, "timeInactiveMicros" : <NumberLong()>, "expiryTime" : <string>, }, "active" : <boolean>, "currentOpTime" : <string>, "effectiveUsers" : [ { "user" : <string>, "db" : <string> } ], "runBy" : [ { "user" : <string>, "db" : <string> } ], "twoPhaseCommitCoordinator" : { "lsid" : { "id" : <UUID>, "uid" : <BinData> }, "txnNumber" : <NumberLong>, "numParticipants" : <NumberLong>, "state" : <string>, "commitStartTime" : <ISODate>, "hasRecoveredFromFailover" : <boolean>, "stepDurations" : <document>, "decision" : <document>, "deadline" : <ISODate> } "opid" : <string>, "secs_running" : <NumberLong()>, "microsecs_running" : <number>, "op" : <string>, "ns" : <string>, "command" : <document>, "configTime" : <Timestamp>, // Starting in 5.0 "topologyTime" : <Timestamp>, // Starting in 5.0 "queryFramework" : <string>, // Starting in 6.2 "planSummary": <string>, "prepareReadConflicts" : <NumberLong()>, "writeConflicts" : <NumberLong()>, "cursor" : { // only for getMore operations "cursorId" : <NumberLong()>, "createdDate" : <ISODate()>, "lastAccessDate" : <ISODate()>, "nDocsReturned" : <NumberLong()>, "nBatchesReturned" : <NumberLong()>, "noCursorTimeout" : <boolean>, "tailable" : <boolean>, "awaitData" : <boolean>, "originatingCommand" : <document>, "planSummary" : <string>, "operationUsingCursorId" : <NumberLong()> }, "msg": <string>, "progress" : { "done" : <number>, "total" : <number> }, "killPending" : <boolean>, "numYields" : <number>, "dataThroughputLastSecond" : <number>, "dataThroughputAverage" : <number>, "locks" : { "ParallelBatchWriterMode" : <string>, "ReplicationStateTransition" : <string>, "Global" : <string>, "Database" : <string>, "Collection" : <string>, "Metadata" : <string>, "DDLDatabase" : <string>, "DDLCollection" : <string>, "oplog" : <string> }, "waitingForLock" : <boolean>, "lockStats" : { "ParallelBatchWriterMode": { "acquireCount": { "r": <NumberLong>, "w": <NumberLong>, "R": <NumberLong>, "W": <NumberLong> }, "acquireWaitCount": { "r": <NumberLong>, "w": <NumberLong>, "R": <NumberLong>, "W": <NumberLong> }, "timeAcquiringMicros" : { "r" : NumberLong(0), "w" : NumberLong(0), "R" : NumberLong(0), "W" : NumberLong(0) }, "deadlockCount" : { "r" : NumberLong(0), "w" : NumberLong(0), "R" : NumberLong(0), "W" : NumberLong(0) } }, "ReplicationStateTransition" : { ... }, "Global" : { ... }, "Database" : { ... }, ... } }, ... ], "ok": <num>, "operationTime": <timestamp>, "$clusterTime": <document> }
Specific Output Examples
These output samples illustrate currentOp output for particular
operations. The fields that make up the actual output vary depending on
the server's role.
Resharding Output Example
{ type: "op", desc: "Resharding{Donor, Recipient, Coordinator}Service <reshardingUUID>", op: "command", ns: "<database>.<collection>", originatingCommand: { reshardCollection: "<database>.<collection>", key: <shardkey>, unique: <boolean>, collation: {locale: "simple"}, // Other options to the reshardCollection command are omitted // to decrease the likelihood the output is truncated. }, {donor, coordinator, recipient}State : "<service state>", approxDocumentsToCopy: NumberLong(<count>), approxBytesToCopy: NumberLong(<count>), bytesCopied: NumberLong(<count>), countWritesToStashCollections: NumberLong(<count>), countWritesDuringCriticalSection : NumberLong(<count>), countReadsDuringCriticalSection: NumberLong(<count>), deletesApplied: NumberLong(<count>), documentsCopied: NumberLong(<count>), insertsApplied: NumberLong(<count>), oplogEntriesFetched: NumberLong(<count>), oplogEntriesApplied: NumberLong(<count>), remainingOperationTimeEstimatedSecs: NumberLong(<count>), allShardsLowestRemainingOperationTimeEstimatedSecs: NumberLong(<estimate>), allShardsHighestRemainingOperationTimeEstimatedSecs: NumberLong(<estimate>), totalApplyTimeElapsedSecs: NumberLong(<count>), totalCopyTimeElapsedSecs: NumberLong(<count>), totalCriticalSectionTimeElapsedSecs : NumberLong(<count>), totalOperationTimeElapsedSecs: NumberLong(<count>), updatesApplied: NumberLong(<count>), }
Global Index Example
{ type: "op", desc: "GlobalIndex{Donor, Recipient, Coordinator}Service <globalIndexUUID}", op: "command", ns: "<database>.<collection>", originatingCommand: { createIndexes: "<database>.<collection>", key: <indexkeypattern>, unique: <boolean>, <Additional createIndexes options> }, {donor, coordinator, recipient}State : "<service state>", approxDocumentsToScan: NumberLong(<count>), approxBytesToScan: NumberLong(<count>), bytesWrittenFromScan: NumberLong(<count>), countWritesToStashCollections: NumberLong(<count>), countWritesDuringCriticalSection : NumberLong(<count>), countReadsDuringCriticalSection: NumberLong(<count>), keysWrittenFromScan: NumberLong(<count>), remainingOperationTimeEstimatedSecs: NumberLong(<count>), allShardsLowestRemainingOperationTimeEstimatedSecs: NumberLong(<estimate>), allShardsHighestRemainingOperationTimeEstimatedSecs: NumberLong(<estimate>), totalCopyTimeElapsedSecs: NumberLong(<count>), totalCriticalSectionTimeElapsedSecs : NumberLong(<count>), totalOperationTimeElapsedSecs: NumberLong(<count>), }
Output Fields
For a complete list of db.currentOp() output fields, see
currentOp.