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

DEFINE USERCATALOGAbbreviation: BFNDBUFNI(number)Specifies the number of I/O buffers VSAM is to use for transmitting thecontents of index entries between virtual and auxiliary storage for keyedaccess.The size of the buffer is the size of the index control interval. The minimumnumber you can specify is the number specified for STRNO.Additional index buffers will improve performance by providing for theresidency of some or all the high-level index (index set records), therebyminimizing the number of high-level index records to be retrieved from DASDfor key-direct processing.numberThe number of index buffers to be used. The minimum number allowed is2 and the maximum number allowed is 255.Abbreviation: BFNICATALOG(mastercatname)Specifies the name and password of the master catalog.Use the CATALOG parameter only if you need to provide the password for amaster catalog that is password-protected. For information on moving a usercatalog to a different system, see z/OS DFSMS: Managing Catalogs.mastercatnameThe name of the master catalog that is required when a user catalog isbeing defined.Abbreviation: CATCONTROLINTERVALSIZE(size)Specifies the size of the control interval for the catalog or component.The size of the control interval depends on the maximum size of the datarecords and the amount of buffer space you provide.If you do not code the CONTROLINTERVALSIZE, VSAM determines the sizeof control intervals. If you have not specified BUFFERSPACE and the size ofyour records permits, VSAM calculates the optimum control interval size forthe data and index components. This is based partly on device characteristics.Ifthe control interval size calculated by VSAM as required for the indexcomponent is greater than the value specified in the parameter, the valuecalculated by VSAM will be used.sizeThe size of the data and index components of a catalog.The maximum control interval size is 32 768 bytes.You can specify a size from 512 to 8K in increments of 512 or from 8K to32K in increments of 2K. K is 1024 in decimal notation. If you select a sizethat is not a multiple of 512 or 2048, VSAM chooses the next highermultiple.Refer to z/OS DFSMS: Using Data Sets for a discussion of the relationshipbetween control interval size and physical block size. The discussion alsoincludes restrictions that apply to control interval size and physical block size.Chapter 19. DEFINE USERCATALOG 205