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Universal Database System UDS/SQL General information
42 U929-J-Z125-9-76
● Central data protection measures
UDS/SQL incorporates effective, flexibly usable protective mechanisms to ensure that
each user group can access only precisely defined parts and sections of the database.
UDS/SQL checks the user’s access rights before requests to the database are actually
executed.
● Simultaneous data access by many users
UDS/SQL permits application-independent data to be accessed by large numbers of
users simultaneously. Their requests are “time interleaved” for processing to optimize
overall throughput.
UDS/SQL also contains functions that prevent users from hindering each other when
they contend for access to the same record.
● Central security concept
The security concept of UDS/SQL includes precautions to protect the data resources
against destruction or loss. Data resources which have been destroyed can be restored
to the most recent consistent status.
● Support for mirrored disks
UDS/SQL supports DRV (Dual Recording by Volume). When DRV is used, the
operating system writes data to two disks simultaneously. This ensures increased avail-
ability and reliability since, even if one of the disks fails, all the data is still consistent,
up-to-date and available to the applications.
● Support for the BS2000 access method FASTPAM
UDS/SQL supports the BS2000 access method FASTPAM, which provides a highly
efficient means of accessing files and realms of the database.
● Support for uninterrupted time conversions
Support for uninterrupted time conversions ensures the continuous and uninterrupted
operation of UDS/SQL during seasonal conversions of the local time, e.g. when
converting from Central European Daylight Saving Time (MESZ) to Central European
Time (MEZ).