When you access a CA-Datacom/DB
database, you can work in either a single user execution environment or a multi-user execution
environment. In a
single user environment, each user has a copy of CA-Datacom/DB and has exclusive use of the database.
The
SAS/ACCESS interface to CA-Datacom/DB runs only under a
multi-user environment. In a
multi-user environment,
many databases can be accessed from many regions concurrently, with
exclusive control at the logical record level. Only one copy of CA-Datacom/DB
is required to handle all regions. Recovery is centralized for all
users.