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

ALTERLOG(ALL). When you specify LOG(ALL), you must also specify theLOGSTREAMID parameter, unless it is already defined.VSAM RLS allows concurrent read or update sharing for nonrecoverablespheres through commit (CICS) and non-commit protocol applications. Fora recoverable sphere, an application must use DFSMStvs to be able to openthe sphere for update using VSAM RLS access.Restriction: LOG cannot be used with LINEAR.LOGSTREAMID(logstream)Changes or adds the name of the forward recovery log stream. It applies to allcomponents in the VSAM sphere.logstreamIs the name of the forward recovery log stream. This can be a fullyqualified name up to 26 characters, including separators. This parameter isrequired if you have specified LOG(ALL).For information about defining log streams for CICS use, see the CICS andVSAM Record Level Sharing: Implementation Guide and z/OS DFSMStvsAdministration Guide.Abbreviation: LSIDRestriction: LOGSTREAMID cannot be used with LINEAR.LIMIT(limit)Used to modify the maximum number (between 1 and 255) of activegeneration data sets (GDSs) that might be associated with a generation datagroup (GDG) base.limitIf the limit is less than the current number of active generations, the oldestgenerations are rolled off until the new limit is satisfied. Any GDSs that arerolled off by this command are listed showing their new status(recataloged, uncataloged, or deleted). For more information about limitprocessing of a GDS, see z/OS DFSMS: Managing Catalogs.If the limit is greater than the current number of active generations, it doesnot cause the roll-in of existing rolled off GDSs. For this function, see theROLLIN parameter.LOCK|UNLOCKControls the setting of the catalog lock attribute, and therefore checks access toa catalog. Use LOCK or UNLOCK when the entry name identifies a catalog. Ifthe LOCK|UNLOCK parameter is not specified, the status of the catalog lockattribute is not changed. Before you lock a catalog, review the information onlocking catalogs in z/OS DFSMS: Managing Catalogs.LOCKIs used when the catalog identified by entryname is to be locked. Lockinga catalog makes it inaccessible to all users without read authority to RACFFACILITY class profile IGG.CATLOCK (including users sharing the catalogon other systems).For protected catalogs, locking an unlocked catalog requires ALTERauthority for the catalog being locked, and read authority to RACFFACILITY profile IGG.CATLOCK. For unprotected catalogs, locking anunlocked catalog requires read authority to RACF FACILITY class profileIGG.CATLOCK.Chapter 5. ALTER 63