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

Chapter 1 41
Glossary of Terms
file when it is created or renamed, and must be supplied to regain access to
the file. The word may be from one to eight alphanumeric characters long
and must begin with an alphabetic character.
log file A file that maintains a record of events. Each event is recorded in a
separate log record, and is correlated with the job or session causing the
event.
logging 1. The process of recording all system modifications to a tape or disk file
for the purpose of recovery or accountability. If the system fails, the log
file can be used to restore the system to its state prior to the failure.
2. The process used by DBCore to record the activity of a DBEnvironment
to enable either rollback or rollforward recovery if necessary.
logging shutdown A shutdown marking the end of the logging cycle. In most cases, it is
performed just prior to either system or database backup.
logic unit (LU) 1.A part of the CPU that executes arithmetic statements.
2. A program or set of programs providing access to a network for an end
user.
logical device (LDEV) The logical representation of a physical device. The
representation includes a numeric identifier and a set of parameters that
define the device and its address.
logical device number An LDEV number is assigned to all hardware components of a
computer system and is used for identification purposes.
logical interchange format (LIF) A standard format for mass storage implemented on
many Hewlett-Packard computers to aid in media transportability.
logical record A collection of fields or related data, treated as a unit, residing in a file. A
logical record is defined in a user program. Its length is smaller than or
equal to the length of the physical record in which it resides.
log off A method of terminating a session. To log off MPE/iX, enter the BYE or
EXIT command.
log on A method of initiating a session. To log on to MPE/iX, enter the HELLO
command and a valid user and account name, plus a group name if
necessary, and any required passwords.
logon group The group accessed by defining a group name when logging on using the
HELLO command. The syntax is
username.accountname, groupname .
Once the desired group is accessed, resident files may be referenced
without fully qualifying them.
logon identity A security device used to verify users to the system. A logon identity
includes a valid user name and account name in the form
user.account .
logon prompt A system prompt (MPE/iX:) that indicates the computer is ready to
initiate a session. See prompt.
logon session The online interaction between a user and the computer. The session
occurs between logging on and logging off.