7 Column Stores
A row store is a row-oriented relational database as it was reviewed in Section 2.1. That is, data are stored in tables and on disk the data in a row are stored consecutively. This row-wise storage is currently used in most RDBMSs. In contrast, a column store is a column-oriented relational database. That is, data are stored in tables but on disk data in a column are stored consecutively.
This chapter discusses column stores and shows that they work very well for certain queries – for example queries that can be executed on compressed data. In such cases, column stores have the advantage of both a compact storage as well as efficient query execution. Conversion of nested records into columnar representation is a further topic ...
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