AEM MK (Microkernels) - TarMK and MongoMK

AEM comes with Oak storage. Oak(Apache Jackrabbit Product) is a new JCR implementation with a completely new internal architecture.

There are two options for the AEM persistence layer back-end used by Oak : TarMK and MongoMK.

Main differences b/w TarMK and MongoMK


Adobe recommendation says we must consider MongoMK when we come across below metrics

Number of named users connected in a day: in the thousands or more.
Number of concurrent users: in the hundreds or more.
Volume of asset ingestion per day: in hundreds of thousands or more.
Volume of page edits per day: in hundreds of thousands or more (including automated updates via Multi Site Manager or news feed ingestion for example).
Volume of searches per day: in tens of thousands or more.


TarMK is optimized for single-node performance whereas MongoMK is designed for scalability and clustered deployments also the volume of data.