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

DEFINE USERCATALOGAbbreviation: CISZ or CNVSZDATACLASS(class)Specifies the name, 1-to-8 characters, of the data class. DATACLASS can bespecified for SMS-managed and non-SMS-managed data sets. It provides theallocation attributes for new data sets. Your storage administrator defines thedata class. However, you can override the parameters defined for DATACLASSby explicitly specifying other attributes. See “Specifying Attribute SelectionOrder” on page 14 for the order of precedence (filtering) the system uses toselect the attributes to assign.The record organization attribute of DATACLASS is not used by DEFINEUSERCATALOG/MASTERCATALOG. If DATACLASS is specified and SMS isinactive, DEFINE will be unsuccessful. DATACLASS cannot be specified as asubparameter of DATA or INDEX.Abbreviation: DATACLASECSHARING|NOECSHARINGIndicate whether or not sharing the catalog can be performed via the couplingfacility.ECSHARINGEnhanced Catalog Sharing (ECS) is allowed. ECS is a catalog sharingmethod that makes use of a coupling facility to improve the performanceof shared catalog requests. Please read about ECS in z/OS DFSMS:Managing Catalogs before enabling ECS for a catalog.Abbreviation: ECSHRNOECSHARINGEnhanced Catalog Sharing (ECS) is not allowed. This is the default.Catalog sharing will be performed, but the ECS sharing method will not beused.Abbreviation: NOECSHRFILE(ddname)Specifies the name of the DD statement that identifies the device and volumeto be used for the catalog. The DD statement should specify DISP=OLD toprevent premature space allocation on the volume. If FILE is not specified andthe catalog’s volume is physically mounted, the volume identified with theVOLUME parameter is dynamically allocated. The volume must be mountedas permanently resident or reserved.FREESPACE(CI_percent[ CA_percent]|0 0)Specifies the amount of space that is to be left free when the catalog is loadedand after any split of control intervals (CI_percent) and control areas(CA_percent).The empty space in the control interval and control area is available for datarecords that are updated and inserted after the catalog is initially loaded.The amounts are specified as percentages. C_percent translates into a number ofbytes that is equal to, or slightly less than, the percentage value of CI_percent.CA_percent translates into a number of control intervals that is equal to, or lessthan, the percentage value of CA_percent.CI_percent and CA_percent, must be equal to or less than 100. If you useFREESPACE(100 100), one data record is placed in each control interval usedfor data and one control interval in each control area is used for data (that is,one data record is stored in each control area when the data set is loaded).206 z/OS V1R6.0 DFSMS Access Method Services for Catalogs