SAP DATA CLUSTER

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Data Clusters
A data cluster is a group of data objects grouped together for the purpose of storage in a storage medium that can only be edited using ABAP statements.
The data objects are written to the storage medium by the statement EXPORT.
The data objects are extracted again by the statement IMPORT.
The statement DELETE can be used to delete any storage medium.
The statement FREE can be used to delete the ABAP Memory.
The statement IMPORT DIRECTORY generates a list of all data objects that have previously been exported to a database table.
The statements for data clusters are complemented by the subclasses of the abstract system class CL_ABAP_EXPIMP_UTILITIES.

Note
As well as the statements described here, some obsolete accesses to data clusters also still exist.