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changeStreamOptions

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  • Definition
  • Syntax
  • Parameter Fields
  • Behavior
  • Example
changeStreamOptions

New in version 6.0.

Available for both mongod and mongos.

An object that contains change stream configuration options.

You can only set changeStreamOptions on mongos or a replica set primary. The value is set cluster-wide.

To set changeStreamOptions for your deployment, run the following command on the admin database:

db.adminCommand( { setClusterParameter: { changeStreamOptions: <value> } } )

To view current values for the changeStreamOptions cluster parameter, run the following command on the admin database:

db.adminCommand( { getClusterParameter: "changeStreamOptions" } )
changeStreamOptions.preAndPostImages.expireAfterSeconds

New in version 6.0.

Default: off

Controls the retention policy of change stream pre- and post-images. Pre- and post-images are the versions of a document before and after document modification respectively. expireAfterSeconds controls how long MongoDB retains pre- and post-images.

When expireAfterSeconds is off, MongoDB uses the default retention policy: pre- and post-images are retained until the corresponding change stream events are removed from the oplog.

To set the minimum pre- and post-image retention time, specify an integer value for expireAfterSeconds.

If a change stream event is removed from the oplog, then the corresponding pre- and post-images are also deleted regardless of the retention time specified with changeStreamOptions.preAndPostImages.expireAfterSeconds.

The following example sets the retention time for pre- and post-images in change streams to 100 seconds:

db.runCommand( {
setClusterParameter: {
changeStreamOptions: { preAndPostImages: { expireAfterSeconds: 100 } }
}
} )
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