Metadata related to the operation. Acts as the resumeToken for the resumeAfter parameter when resuming a change stream.copycopied`{ "_data" : <BinData
hex string> } The_data` type depends on the MongoDB versions and, in some cases, the feature compatibility version (fcv) at the time of the change stream’s opening/resumption. For details, see Resume Tokens.
operationType
string
The type of operation that occurred. Can be any of the following values:insert``delete``replace``update``drop``rename``dropDatabase``invalidate
fullDocument
document
The document created or modified by the insert, replace, delete, update operations (i.e. CRUD operations).For insert and replace operations, this represents the new document created by the operation.For delete operations, this field is omitted as the document no longer exists.For update operations, this field only appears if you configured the change stream with fullDocument set to updateLookup. This field then represents the most current majority-committed version of the document modified by the update operation. This document may differ from the changes described in updateDescription if other majority-committed operations modified the document between the original update operation and the full document lookup.
ns
document
The namespace (database and or collection) affected by the event.
ns.db
string
The name of the database.
ns.coll
string
The name of the collection.For dropDatabase operations, this field is omitted.
to
document
When operationType : rename, this document displays the new name for the ns collection. This document is omitted for all other values of operationType.
to.db
string
The new name of the database.
to.coll
string
The new name of the collection.
documentKey
document
A document that contains the _id of the document created or modified by the insert, replace, delete, update operations (i.e. CRUD operations). For sharded collections, also displays the full shard key for the document. The _id field is not repeated if it is already a part of the shard key.
updateDescription
document
A document describing the fields that were updated or removed by the update operation.This document and its fields only appears if the operationType is update.
updateDescription.updatedFields
document
A document whose keys correspond to the fields that were modified by the update operation. The value of each field corresponds to the new value of those fields, rather than the operation that resulted in the new value.
updateDescription.removedFields
array
An array of fields that were removed by the update operation.
clusterTime
Timestamp
The timestamp from the oplog entry associated with the event.For events that happened as part of a multi-document transaction, the associated change stream notifications will have the same clusterTime value, namely the time when the transaction was committed.On a sharded cluster, events that occur on different shards can have the same clusterTime but be associated with different transactions or even not be associcated with any transaction. To identify events for a single transaction, you can use the combination of lsid and txnNumber in the change stream event document.New in version 4.0.
txnNumber
NumberLong
The transaction number.Only present if the operation is part of a multi-document transaction.New in version 4.0.
lsid
Document
The identifier for the session associated with the transaction.Only present if the operation is part of a multi-document transaction.New in version 4.0.
