Systems and methods of database tenant migration

A system to migrate a tenant of a database system from a source database instance to a destination database instance, the system comprising:

• at least one physical storage device to store tenant data associated with a tenant identifier of the tenant to be migrated to the destination database instance, the at least one physical storage device including groupings of data have pointers to physical locations of the at least one physical storage device and wherein the groupings of data include metadata to access at least portions of the data in the at least one physical storage device;
• and
• one or more servers for the source database instance and the destination database instance that are communicatively coupled to the at least one physical storage device, the one or more servers to quiesce the tenant data of the tenant to be migrated from the source database instance to the destination database instance so that no new data is written to the at least one physical storage device of the database system associated with the tenant identifier at the source database instance, transmit metadata of the tenant to be migrated from the source database instance to the destination database instance without moving the tenant data in the at least one physical storage, wherein the destination database instance is located on a different physical server or virtualized server than the source database instance, and wherein the metadata includes extent references to extents of the tenant data in the at least one physical storage, key ranges of the extents, and tenant identifier data for the extents, wherein at least one key of the key ranges includes the tenant identifier to associate the tenant with the tenant data, and modify, at the destination database instance, a key range of the tenant data in the metadata of the tenant by adding at least one new extent reference to the destination database instance's active extent reference set that contains keys for the tenant being migrated from the source database instance so that the destination database instance points to the groupings of data in the at least one physical storage device for the tenant data to access the tenant data, without moving the tenant data in the at least one physical storage.