Patent attributes
Methods, computer program products, and systems are presented. The method computer program products, and systems can include, for instance: examining an invoked database query for execution on a database; scanning zone data from at least one data node of the database in dependence on the examining, the at least one data node of the database having a storage system and storing in the storage system table data of a table, wherein security tags are associated to respective rows of the table, and wherein the zone data specifies attributes of storage of the table within respective storage system extents of the storage system; identifying, using the zone data, at least one excludible extent of the storage system extents; and excluding the at least one excludible extent from an IO data access operation in processing of the invoked database query.
