The Atlas Data Federation namespace catalog contains namespace metadata (such as
databases, collections, and partitions) for each wildcard (
collection in each federated database instance store in the federated database instance storage configuration.
For commands and queries on wildcard collections, Data Federation returns the
data from the catalog or returns an error if the federated database instance store doesn't
When objects that are included in a wildcard collection specification
are modified in your S3 bucket, the catalog must be updated for you
to see the changes when you run
list commands against wildcard
collections. By default, the catalog is refreshed every hour for all
active federated database instances. In addition, the namespace metadata catalog is
refreshed in the background when you:
Query a collection.
You can determine when the catalog was last updated by using the
catalogInfo command and can manually update the catalog
by using the
updateCatalog command. You must have the
to update the catalog.