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

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

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

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DEFINE USERCATALOGIf you designate both user-specified and SMS-specified volume serial numbers<strong>for</strong> an SMS-managed data set, the user-specified volume serials numbers(volsers) must be requested first in the command syntax. <strong>Catalogs</strong> can onlyreside on one volume.The VOLUME parameter interacts with other DEFINE CATALOG parameters.Ensure that the volume you specify <strong>for</strong> the catalog is consistent with thecatalog’s other attributes:vvCYLINDERS, RECORDS, TRACKS: The volume contains enough unallocatedspace to satisfy the catalog’s primary space requirement. Space on thevolume might already be allocated to non-VSAM data sets and system datasets.FILE: The volume in<strong>for</strong>mation supplied with the DD statement is consistentwith the in<strong>for</strong>mation specified <strong>for</strong> the catalog and its components.A user catalog can be defined on a mass storage volume.Abbreviation: VOLOptional ParametersBUFFERSPACE(size|3072)Provides the amount of space <strong>for</strong> buffers. The size you specify <strong>for</strong> the bufferspace helps VSAM determine the size of the data component’s and indexcomponent’s control interval. If BUFFERSPACE is not coded, VSAM attemptsto get enough space to contain two data set control intervals and, if the dataset is key-sequenced, one index control interval.The size specified cannot be less than enough space to contain two datacomponent control intervals. If the data is key-sequenced, it should containonly one index control interval. If the specified size is less than VSAM requires<strong>for</strong> the buffers needed to run your job, the default BUFFERSPACE calculationoverrides the size.This is the default BUFFERSPACE calculation: Data control interval size x 2 +index control interval size.sizeProvides the amount of space, in bytes, <strong>for</strong> buffers. Size can be expressedin decimal (n), hexadecimal (X’n’), or binary (B'n') <strong>for</strong>m. However, it mustnot exceed 16 776 704.Abbreviation: BUFSP or BUFSPCBUFND(number)Specifies the number of I/O buffers VSAM is to use <strong>for</strong> transmitting databetween virtual and auxiliary storage.The size of the buffer is the size of the data component control interval. Theminimum number you can specify is the number specified <strong>for</strong> STRNO plus 1.Note that minimum buffer specification does not provide optimum sequentialprocessing per<strong>for</strong>mance. Additional data buffers benefit direct inserts orupdates during control area splits and will also benefit spanned recordaccessing.numberThe number of data buffers to be used. The minimum number allowed is3; the maximum number allowed is 255.204 z/<strong>OS</strong> <strong>V1R6.0</strong> <strong>DFSMS</strong> <strong>Access</strong> <strong>Method</strong> <strong>Services</strong> <strong>for</strong> <strong>Catalogs</strong>

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