LAZER DBMS is a powerful interactive database management system
designed and developed specifically for the Open VMS operating
system. LAZER provides the tools to manage and control access to your
data by multiple users, to protect the integrity of the data, and to
increase programmer productivity.
Efficiency and integrity are two key elements in describing the
quickest and the most stable DBMS available to the Open VMS
user. LAZER DBMS provides the data security and performance features
that are required on large scale database applications. LAZER is also
easy to use and requires a minimum of systems resources, which makes
it suitable for small and medium scale applications as well.
LAZER DBMS can accommodate complex data relationships because it
uses a powerful network data structure. Applications can access data
directly by issuing calls to the database manager, without the need
for pre-compilers or pre-processors. Features are as follows:
- Each process can access up to 20 databases concurrently. This
feature is beneficial in integrated applications that allow a user to
access several applications simultaneously.
- LAZER DBMS provides the facilities for a database to be shared
and distributed among some or all the nodes of a VAXCluster. Whether a
database is local or distributed will be completely transparent to the
users and the application programs.
- LAZER DBMS performs before-image logging with automatic
rollback. In case of a program or system failure, all updates not yet
committed will be backed out automatically.
- LAZER DBMS has the facility to log functions and after-images
of all database updates. These journal records can be used to recover
from a fatal disk failure by rolling forward from a backup copy of the
database, using after-images in the journal to reapply all committed
- LAZER DBMS can accommodate very large databases: up to 2
billion records per dataset, up to 255 datasets per database, up to
64 Kbytes per record, up to 1024 users per database, and up to 64
file-extents per dataset.
- LAZER DBMS provides the Database Administrator with the tools
to optimize performance for each database. Extensive buffer caching
and buffer sharing (up to 2 gigabytes of buffer space per database),
and I/O transfer clustering are all used to increase efficiency on the