This is the section for VSAM data set association information.
This record ties
data and index components to the sphere name and provides other VSAM-related
information. The record type for this record is A.
- Name
- Description
- DCADSNAM
- 1-to-44 character component name of the data or index component
of the data set.
- DCAASSOC
- 1-to-44 character sphere name of the data set. This is
also referred to as the cluster name.
- DCAFLAG1
- This is the first byte of information flags for VSAM data sets.
The following are indicated if the specified bit is 1.
- DCAKSDS
- The data set is a VSAM key-sequenced data set. The
specified bit will only be set in the first volume of a multiple volume
VSAM dataset. Second and subsequent volumes will be zero for all
types of VSAM data sets.
- DCAESDS
- The data set is a VSAM entry-sequenced data set.
- DCARRDS
- The data set is a VSAM relative record data set. The
specified bit will only be set in the first volume of a multiple volume
VSAM dataset. Second and subsequent volumes will be zero for all
types of VSAM data sets.
- DCALDS
- The data set is a VSAM linear data set. The
specified bit will only be set in the first volume of a multiple volume
VSAM dataset. Second and subsequent volumes will be zero for all
types of VSAM data sets.
- DCAKRDS
- The data set is a key range data set. The specified
bit will only be set in the first volume of a multiple volume VSAM
dataset. Second and subsequent volumes will be zero for all types
of VSAM data sets.
- DCAAIX
- The data set is a alternate index data set.
- DCADATA
- This component is a data component.
- DCAINDEX
- This component is an index component.
- DCAFLAG2
- This is the second byte of information flags for VSAM data sets.
The following are indicated if the specified bit is 1.
- DCAKR1ST
- This is the first segment of a key range data set.
- DCAIXUPG
- The data set is an alternate index data set that is upgraded when
the base cluster changes.
- DCAVRRDS
- The data set is a VSAM variable length relative record data set.
- DCANSTAT
- This record does not contain VSAM statistics. VSAM statistics
are valid only for the first extent on the first volume for the data
set. If this bit is set, the following fields will contain zeros:
- DCAHURBA
- DCAHARBA
- DCANLR
- DCADLR
- DCAINR
- DCAUPR
- DCARTR
- DCAASP
- DCACIS
- DCACAS
- DCAEXC
- DCARKP
- DCAKLN
- DCAHURBC
- DCAHARBC
- DCASRCI
- Relative CI. If this bit is set, fields DCAHURBC and DCAHARBC
should be used rather than DCAHARBA and DCAHURBA.
- DCAG4G
- If this bit is set, the data set can be extended addressability
(greater than 4 gigabytes).
- DCAHURBA
- The high-used relative byte address for the data set. This number
represents the "high water mark" for the data set, and under normal
circumstances, represents the current amount of space used by the
data set.1
- DCAHARBA
- The high-allocated relative byte address for the data set. This
number represents the total amount of space that has been allocated
to the data set across all extents.1
- DCANLR
- The number of logical records that exist in the data set.1
- DCADLR
- The number of logical records that have been deleted from the
data set.1
- DCAINR
- The number of logical records that have been inserted into the
data set.1
- DCAUPR
- he number of logical records that have been updated in the data
set.1
- DCARTR
- The number of logical records that have been retrieved from the
data set.1
- DCAASP
- The amount of space, in bytes, that is available (freespace) for
the data set.1
- DCACIS
- The number of control interval splits that have occurred for the
data set.1
- DCACAS
- The number of control area splits that have occurred for the data
set.1
- DCAEXC
- The number of execute channel program instructions that have been
issued for the data set.1
- DCARKP
- The offset of the key for the data set.1
- DCAKLN
- The length of the key for the data set.1
- DCAHURBC
- The high-used relative byte address for the data set. This number
represents the high-water mark for the data set, and under normal
circumstances, represents the current amount of space used by the
data set. This value is calculated from CI size times the number of
CIs if the DCASRCI bit is on.1
- DCAHARBC
- The high-allocated relative byte address for the data set. This
number represents the total amount of space that has been allocated
to the data set across all extents. This value is calculated from
CI size times the number of CIs if the DCASRCI bit is on.1