MPE/iX Glossary of Terms and Acronyms (32650-90887)

56 Chapter1
Glossary of Terms
rollback recovery In ALLBASE/SQL and IMAGE database management systems, a
process that ensures all completed transactions are made permanent and
that all incomplete transactions are undone.
rollforward recovery A database process that reconstructs a DBEnvironment
(ALLBASE/SQL) or database (IMAGE) from backups by processing
completed transactions from a log file.
route The course through the network that a message takes from a source node
to a destination node. A route can pass through intervening nodes.
row In ALLBASE/SQL a single occurrence of one or more columns in a table.
RS 232-C The "recommended standard" electrical interface (American National
Standards Institute specification) for communication among computers
and peripherals, such as terminals and printers. This standard specifies
mechanical and electrical requirements. It uses a standard interface in a
data communications network, with lettered pin assignments for ground,
data, control, and timing circuits. The data signaling rate is from 0 to
20,000 bps in bit-serial operation, synchronous, and asynchronous.
RS 422 A "recommended standard" for balanced voltage digital interface circuits.
It is used between data terminal equipment (DTE) and data
circuit-terminating equipment (DCE) or as a point-to-point
interconnection of serial binary signals between digital equipment. The
data signaling rate is up to 10 Mbit per second (Mbps).
run To execute a program.
run time The time a program is run.
save files capability (SF capability) The capability allowing users to save the files
they create. It is assigned by default to accounts and users.
savepoint A place within a DBCore transaction to which you can rollback (partially
undo) then continue with same transaction.
scaling To divide the graphics area into units convenient for your application.
scanner/parser A routine that subdivides an instruction into components that the
operating system (or another subsystem) can more easily understand and
use.
scratch a volume To make data unavailable on a volume so that the volume can be
reinitialized. In effect, to delete data on a volume.
scratch tapes Used tapes containing information that is no longer needed.
SCRATCH volume A volume whose data is no longer needed that has been marked as
available for a new volume or volume set. The SCRATCHVOL command
marks the volume. The UNSCRATCHVOL unmarks the volume without
losing any data or label information, provided the disk has not been
written to.
scrolling The act of adding a new line of data to a video terminal's screen by adding
it to the bottom of the screen and shifting all previous lines upward.
search path An MPE/iX mechanism that controls which file is opened once a command