IBM OS/390 manual Resource Access Control Facility RACF. An

Q

qualified name. (1) A data name explicitly accompanied by a specification of the class to which it belongs in a specified classification system. (2) A name that has been made unique by the addition of one or more qualifiers.

R

RACF. Resource Access Control Facility. An

IBM-licensed program that provides for access control by identifying and verifying the users to the system, authorizing access to protected resources, logging the detected unauthorized attempts to enter the system, and logging the detected accesses to protected resources.

read access. In computer security, permission to read information.

real storage. The main storage in a virtual storage system. Physically, real storage and main storage are identical. Conceptually however, real storage represents only part of the range of addresses available to the user of a virtual storage system. Traditionally, the total range of addresses available to the user was provided by the main storage.

real storage management (RSM). Routines that control allocation of pages in real storage.

reason code. A code that identifies the reason for a detected error.

record format. The definition of how data are structured in the records contained in a file. The definition includes record name, field names, and field descriptions, such as length and data type. The record formats used in a file are contained in the file description.

record type. The classification of records in a file.

recorder file. Synonym for system recorder file.

recovery procedure. (1) A process in which a specified data station attempts to resolve conflicting or erroneous conditions arising during the transfer of data. (2) An action performed by the operator when an error occurs to permit processing to continue.

reserved word. (1) In programming languages, a keyword that may not be used as an identifier. (2) A word used in a source program to describe an action to be taken by the program or the compiler. It must not appear in the program as a user-defined name or a system name.

Resource Access Control Facility (RACF). An

IBM-licensed program that provides for access control

by identifying and by verifying the users to the system, authorizing access to protected resources, logging the detected unauthorized attempts to enter the system, and logging the detected accesses to protected resources.

resource definition online (RDO). A CICS interactive facility to create and modify system resources.

response time. The elapsed time between the end of an inquiry or demand on a computer system and the beginning of the response; for example, the length of time between an indication of the end of an inquiry and the display of the first character of the response at a user terminal.

retention period. (1) The length of time for which data on a data medium is to be preserved.

return code. A value returned to a program to indicate the results of an operation requested by that program.

RMF . Resource Measurement Facility. An IBM licensed program that measures selected areas of system activity and presents the data collected in the format of printed reports, system management facilities (SMF) records, or display reports. Use RMF to evaluate system performance and identify reasons for performance problems.

RJE. Remote Job Entry. Submission of job control statements and data from a remote terminal, causing the jobs described to be scheduled and executed as though encountered in the input stream.

rolling window. Synonymous with sliding window.

S

SAA environments. Those environments in which IBM intends to provide full implementation of applicable SAA architectural elements.

SAM-VSAM . SAM files in VSAM-managed space.

save area. Area of main storage in which contents of registers are saved.

scheduler. A computer program designed to perform functions such as scheduling, initiation, and termination of jobs.

SDSF. System Display and Search Facility. An IBM licensed program that or element of OS/390 that allows TSO/E users to browse JES2 spooled data sets, and view and manipulate JES2 job queues, and devices.

secondary space allocation. In systems with VSAM, area of direct access storage space allocated after primary space originally allocated is exhausted.

578VSE to OS/390 Migration Workbook