z/OS V1R6.0 DFSMS Access Method Services for Catalogs

PDSE.See partitioned data set extendedperformance. (1) A measurement of the amount ofwork a product can produce with a given amount ofresources. (2) In a system-managed storageenvironment, a measurement of effective dataprocessing speed with respect to objectives set by thestorage administrator. Performance is largelydetermined by throughput, response time, and systemavailability.permanent data set. A user-named data set that isnormally retained for longer than the duration of a jobor interactive session. Contrast with temporary data set.plaintext. A data set or key which is not enciphered(with the cryptographic option). A data set or key isplaintext before it is enciphered and after it isdeciphered.pool storage group. A type of storage group thatcontains system-managed DASD volumes. Pool storagegroups allow groups of volumes to be managed as asingle entity. See also storage group.portability. The ability to use VSAM data sets withdifferent operating systems. Volumes whose data setsare cataloged in a user catalog can be removed fromstorage devices of one system, moved to anothersystem, and mounted on storage devices of that system.Individual data sets can be transported betweenoperating systems using access method services.portable data set. A data set that can be transportedbetween systems using access method services.primary space allocation. Amount of space requestedby a user for a data set when it is created. Contrastwith secondary space allocation.primary storage. A DASD volume available to usersfor data allocation. The volumes in primary storage arecalled primary volumes. See also storage hierarchy.Contrast with migration level 1, migration level 2.prime index. The index component of akey-sequenced data set.prime key. One or more characters within a datarecord used to identify the data record or control itsuse. A prime key must be unique.private. The state of a tape volume which containsuser-written data. A private volume is requested byspecifying the volume serial number.private volume. A tape volume which has beenassigned the private use attribute by the software. If thecartridge resides in a 3495, it is assigned to the privatecategory.Programmed Cryptographic Facility (PCF). (1) AnIBM licensed program that provides facilities forenciphering and deciphering data and for creating,maintaining, and managing cryptographic keys. (2) TheIBM cryptographic offering, program product 5740-XY5,using software only for encryption and decryption.Qqualified name. A data set name consisting of a stringof names segmented by periods; for exampleTREE.FRUIT.APPLE is a qualified name.RRACF.See Resource access control facility.RACF authorization. (1) The facility for checking auser’s level of access to a resource against the user’sdesired access. (2) The result of that check.RBA.See relative byte addressrecord. A set of data treated as a unit. See index record,data record, stored record.recoverable data set. A data set that can be recoveredusing commit, backout , or forward recoveryprocessing.recovery. The process of rebuilding data after it hasbeen damaged or destroyed, often by using a backupcopy of the data or by reapplying transactions recordedin a log.recovery volume. The first volume of a prime index ifthe VSAM data set is a key-sequenced cluster; the firstvolume of the data set if entry-sequenced.relative byte address (RBA). The displacement of adata record or a control interval from the beginning ofthe data set to which it belongs; independent of themanner in which the data set is stored.relative record data set (RRDS). A VSAM data setwhose records are loaded into fixed-length, orvariable-length slots.Resource Access Control Facility (RACF). An IBMlicensed program that is included in z/OS SecurityServer and is also available as a separate program forthe z/OS and VM environments. RACF provides accesscontrol by identifying and verifying the users to thesystem, authorizing access to protected resources,logging detected unauthorized attempts to enter thesystem, and logging detected accesses to protectedresources.retained lock. A lock protecting transaction updateswhen a problem delays transaction recovery of theupdates. The retained status is cleared when transactionrecovery completes.RLS.Record level sharingGlossary 521