SAP SE
DATA TRANSFER AND MANAGEMENT SYSTEM FOR IN-MEMORY DATABASE

Abstract:

Various embodiments for providing a data transfer and management system are described herein. An embodiment operates by determining that data of a column is stored in a column loadable format in which all of the data of the column is moved from the disk storage location to a memory responsive to a data request. A data vector that identifies a plurality of value IDs corresponding to at least a subset of the plurality of rows of the column, is identified. A page format that provides that a portion of the data of the column across a subset of the plurality of rows is moved from the second disk storage location into the memory responsive to the data request is determined. The entries of the data vector are requested, converted from column loadable format into the page persistent format, and stored across one or more memory pages.