变更事件

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Operation Types
恢复令牌
Expanded Events

Change streams watch collections, databases, or deployments for changes.

When a change occurs on a watched resource, the change stream returns a change event notification document, with information on the operation and the changes it made.

Operation Types

事件	说明
`create`	Occurs on the creation of a collection. 需要将 showExpandedEvents 选项设置为 `true`。 6.0 版本中的新功能。
`createIndexes`	Occurs on the creation of indexes on the collection. 需要将 showExpandedEvents 选项设置为 `true`。 6.0 版本中的新功能。
`delete`	Occurs when a document is removed from the collection.
`drop`	Occurs when a collection is dropped from a database.
`dropDatabase`	Occurs when a database is dropped.
`dropIndexes`	Occurs when an index is dropped from the collection. 需要将 showExpandedEvents 选项设置为 `true`。 6.0 版本中的新功能。
`insert`	Occurs when an operation adds documents to a collection.
`invalidate`	Occurs when an operation renders the change stream invalid.
`modify`	Occurs when a collection is modified. 需要将 showExpandedEvents 选项设置为 `true`。 6.0 版本中的新功能。
`refineCollectionShardKey`	Occurs when a shard key is modified. 6.1 版本新增内容。
`rename`	Occurs when a collection is renamed.
`replace`	Occurs when an update operation removes a document from a collection and replaces it with a new document.
`reshardCollection`	Occurs when the shard key for a collection and the distribution of data changes. 需要将 showExpandedEvents 选项设置为 `true`。 6.1 版本新增: （在 6.0.14 中也可用）
`shardCollection`	Occurs when a collection is sharded. 需要将 showExpandedEvents 选项设置为 `true`。 6.0 版本中的新功能。
`update`	Occurs when an operation updates a document in a collection.

恢复令牌

Each change event includes an _id field, which contain a document. This document can serve as the resume token when starting a change stream.

Expanded Events

6.0 版本中的新功能。

Starting in MongoDB 6.0, change streams support change notifications for DDL events, like the createIndexes and dropIndexes events. To include expanded events in a change stream, create the change stream cursor using the showExpandedEvents option.

例如：

let cur = db.names.aggregate( [ {
   $changeStream: {
       showExpandedEvents: true
     }
   }
 ] )
cur.next()

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