This is the base segment. It contains the MetaStor, which is made up of definitions, characteristics, access paths, and storage locations of all data and programs.
The logical view of the data is stored in the form of tables. The data for a table resides completely within a specific segment and can span all the physical data sets comprising the segment. The definition of the table is stored in segment 0, which is known as the MetaStor.
As the requirements of test or production systems change, some people need to increase or decrease the amount of free space in the Pagestore. Free space can be modified in the Pagestore in three ways:
TIBCO Object Service Broker for z/OS Managing Backup and Recovery for more information about restoring the Pagestore from backup, and about moving the Pagestore.