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On the Data Class Define panel,
the SCDS Name and Data Class Name
are output fields that contain the SCDS and data class names you specified
in the Data Class Application Selection panel.
All of the input
fields are optional and have a default value
of blanks. A blank indicates that no value is assigned to a parameter,
and end users need to specify the value explicitly if it is required
and they intend to use the data class. Otherwise, their jobs might
fail. When users override some data class attributes, they should
ensure that the remaining attributes in the data class do not conflict
with the explicitly specified attributes.
You can specify the
following attributes on page 1 of the Define
Data Class panel:
- Description
- Is an optional description
for the data class. It can be up
to 120 characters.
- Recfm
- Specifies the data set record format. You
can specify one of
the following, with the option of appending either an A (ISO/ANSI
control character) or an M (Machine control character):
- U
- Undefined
- V
- Variable
- VS
- Variable
spanned
- VB
- Variable blocked
- VBS
- Variable blocked spanned
- F
- Fixed
- FS
- Fixed standard
- FB
- Fixed blocked
- FBS
- Fixed blocked standard
If you specify Recfm, you cannot specify the Recorg attribute.
- Lrecl
- Specifies
the logical record length in bytes. If you leave the
Recorg field blank, you can specify a LRECL value from 1-32760 (or
leave it blank). If you choose a Recorg value of KS, ES, or RR, you
can specify a LRECL value from 1-32761 (or leave it blank). If the
Recorg value is KS, the LRECL value must be greater than or equal
to the value you specify for the Keylen attribute. Also if the Recorg
value is KS and you specify values for both the Keylen and Keyoff
attributes, then the LRECL value must be greater than or equal to
the sum of the Keylen and Keyoff attributes.
If the Recorg value
is LS, the LRECL attribute is ignored and the CIsize value is 4096.
- Override Space
- Specifies whether DATA CLASS attributes override
attributes
obtained from other sources (JCL, AMS control cards or LIKE=). Override
Space flag has two values:
- YES
- data class override takes effect.
- NO
- no data class override. NO is the
default.
You can override the following JCL Space subparameters, including
dynamic allocations, such as TSO ALLOCATE:
- Space type (CYL,TRK, Block length, or record length plus AVREC)
- Primary Quantity
- Secondary Quantity
- Directory
blocks
You can override the following IDCAMS DEFINE space parameters:
- Cylinders (Primary, Secondary)
- Tracks (Primary, secondary)
- Kilobytes (Primary, Secondary)
- Megabytes (Primary, Secondary)
- Records (Primary, Secondary)
- Controlintervalsize (CISIZE
DATA)
- Freespace (CI-percent, CA-percent)
Note: - You must explicitly specify AVGREC, AVG VALUE, PRIMARY,
SECONDARY,
and DIRECTORY. ISMF primes these fields with blanks, and returns an
error message for each blank field. 0 is a valid value.
- If
you set RECORG to KS, ES, RR, or LS, then you must also explicitly
specify CISIZE DATA. If you set RECORG to KS, then you must also explicitly
specify %FREESPACE CI and %FREESPACE CA. ISMF primes these fields
with blanks, and returns an error message for each blank field. 0
is a valid value.
- SMS gets PRIMARY SPACE, SECONDARY SPACE,
allocation units, and
directory blocks either from JCL or from the DATA CLASS. The SPACE
information in the DATA CLASS must be all inclusive, otherwise jobs
might fail or produce unexpected results.
- If you set Override
Space to YES, the SPACE information specified
in DATA CLASS overrides the SPACE information specified on JCL, even
for non-SMS managed data sets. The SPACE information in the DATA CLASS
must be all inclusive, otherwise jobs might fail or produce unexpected
results.
- Space
- Specifies
a request for space in records, eliminating track
and cylinder space requests.
- Avgrec
- Specifies
a scaling factor for primary and secondary record
allocations. It can have the following factors:
- U
- Multiplies the allocation
quantity by 1
- K
- Multiplies the
allocation quantity by 1024
- M
- Multiplies
the allocation quantity by 1048576
- Avg Value
- Specifies the average length of each
record.
- Primary
- Specifies the primary
allocation quantity of records as multiplied
by the scaling factor (Avgrec).
- Secondary
- Specifies the secondary allocation quantity of records as multiplied
by the scaling factor (Avgrec).
- Directory
- Specifies the number of directory
blocks for a PDS. It is valid
only when the following fields are blank:
- Recorg
- Keyoff
- CIsize Data
- %
Freespace CI
- % Freespace CA
- Shareoptions Xregion
- Shareoptions Xsystem
If you specify the following values:
- Avgrec = K
- Avg Value = 80
- Primary
= 500
- Secondary = 100
- Directory = 100
you
request 40000 KB of primary space, 8000 KB of secondary
space, and 100 directory blocks. The JCL used to accomplish the same
task looks like:
//DD1 ... SPACE=(80,(500,100,100)),AVGREC=K ...
- Retpd or Expdt
- Specifies
the retention period or expiration date that is associated
with the data class being defined. Retention period is the number
of days (0 to 93000) and expiration date is
the date when you want the definition to expire. The default is 'blank'
for Expdt and 0 for Retpd, no expiration time.
- Volume Count
-
Specifies
the maximum number of SMS-managed DASD or mountable volumes a data
set can span, with the following exceptions. Valid values are 1 through
59.
For striped VSAM data set, the volume count can be overridden
by calculations derived from the sustained data rate (SDR) or the
dynamic volume count which ever is greater up to the maximum of 59.
For non-VSAM striped data set, volume count is determined by sustained
data rate(SDR), dynamic volume count has no affect and the maximum
count is 59. For managed mountable volumes, this value can be overridden
by the volume count specified in JCL up to a maximum of 255. Dynamic
volume count has no affect to tape data sets.
Volume count is
ignored for data sets to which no storage class is assigned. The default
is 1.
Note: In JES3 systems, volume count is also ignored
for managed mountable data sets.
- Add'l
Volume Amount
- Specifies
whether primary or secondary allocation amounts are
to be used when the data set is extending to a new volume. You can
specify:
- P for primary
- S for secondary
If you leave the field blank, the system default of primary
is used. This attribute is used during VSAM EOV processing, and is
only applicable to any VSAM multivolume data sets allocated in the
extended format.
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