SAP SE
INDEX COMPRESSION USING REORDERING AND SELF-UPDATES

Abstract:

The present disclosure involves systems, software, and computer implemented methods for compression operation combining duplicate index entries independent of a data model. One example method includes operations to identify an update to at least one entry in a compressed index that includes a plurality of entries, each associated with a unique entry ID. An entry ID of each entry associated with the update are identified. A self-update is performed for each entry not associated with the entry IDs associated with the update, which comprises inserting a value associated with those non-updated entries to an uncompressed index in connection with that entry's corresponding entry ID. For each entry associated with the update, a particular update value from the identified update is inserted into the uncompressed index associated with the particular entry ID. When completed, the uncompressed index is compressed into a new version of the compressed index.