You are interested in HANA internal columns being part of the column store.
You are interested in optimizing or removing internal columns in order to reduce memory usage.
Indexing; Join operations; CONCAT_ATTRIBUTE; ROWID; TEXT; UNKNOWN; TREX_EXTERNAL_KEY; TREX_UDIV; VALID_FROM; VALID_TO; OPTIMIZE_METAMODEL; NO_OPTIMIZE_METAMODEL; , KBA , HAN-DB-PER , SAP HANA Database Persistence , How To
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