This form of data evaluation is called columnar projection. The analysis performance of in-memory databases has also improved over time, seeing as only specific columns need to be analyzed, and not all of them. Storage space and transmission times are therefore reduced. ![]() By storing data with identical values together, the system minimizes the number of existing data. The storage format for column-based data storage is called columnar format. In a column-based storage, the data is assigned to its corresponding categories in this way: name 1, name 2, city 1, city 2, country 1, country 2. For example, if the values “name, city, and country” are stored, the data would be arranged as follows: name 1, city 1, country 1, name 2, city 2, country 2. Row-oriented databases arrange the collected data records together in one row. ![]() When storing data with an in-memory database, a distinction is made between column-oriented and row-oriented data storage, whereby some database systems use both methods of data storage.
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