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# Connector Datastores

IDOL NiFi Ingest Connectors keep a record of the items they have retrieved so that they do not need to synchronize those items again. Each time it synchronizes with your data repository, a NiFi Ingest Connector only retrieves new items, modified items, and information about the items that have been deleted.

NiFi Ingest Connectors can store this information in an internal datastore, or connect to an external database server. The internal datastore is created automatically by the connector and requires no additional configuration. However, the internal datastore is accessible only to the connector that created it. If you want to run an Apache NiFi cluster, you must configure your NiFi Ingest connectors to store their state information in an external database.

Each NiFi Ingest connector has an optional property named Database Service. To use an external database, create a database service as described in Create a Database Service, and set this property to the name of the service you create. When you do not set the Database Service property, the connector uses an internal datastore.

TIP:

You can use the same database service for multiple NiFi Ingest connectors. Each connector creates separate tables in the database.

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