VSAM Association Record Field
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
1 The value for this record is not valid
in the following cases:
- All integrated catalog facility catalogs and VVDSs allocated to the catalog address space
- All record type records generated for secondary extents of VSAM data sets.