The following terms and acronyms are used in the CIA Report KSDS Catalog:
This field is the device class of the volume(s) on which the component resides. All of the volumes for a particular component must be of the same device type, but the device type can be different for the data and index components.
EXTENTS represent the total number of extents in which the component resides.
The control interval (CI) is the size for the component. This is the unit of information transmitted to or from auxiliary storage by VSAM.
This is the physical record size used to store information in the cluster. There is a whole number of physical records that comprise one control interval.
This is the number of physical records stored on each track. This will give an indication of the effectiveness of the blocking factor on this particular DASD device.
The high used relative byte address (RBA) in this component. This address effectively marks where the first empty control area resides, or the end of the data set if all space has been used.
The high allocated relative byte address (RBA) in this component. This address marks the end of the data set in its currently allocated extents.
TRKS/CA represents the number of tracks per control area. For larger clusters this value should be the same as the number of tracks per cylinder on this type of DASD. This would represent the ideal control area size of one cylinder.
The number of control intervals that are contained in one control area. This is an important number in key-sequenced data sets when determining the appropriate control interval size for the index. See Unreferenceable Data Control Intervals.
FREE%-CI represents the control interval freespace percentage with which the cluster was defined. This is the percentage of freespace to be reserved in each control interval when it is loaded.
This value represents the percentage of control intervals in every control area that is to be left empty when the cluster is loaded. It is specified when the cluster is initially defined.
This is the length of the average record (specified when the cluster was defined) that the user expects the data set to contain. When variable-length records occur in a data set, this value can or cannot be an accurate reflection of the actual data, but does the user supply an estimate by which VSAM estimates space requirements when loading the cluster. The actual average record length of the data set is shown in the AVG RECSZ field in the statistics summary of this report.
This is the maximum record length allowed in the cluster. If this field is the same value as AVG LRECL, the file contains fixed-length records; otherwise they are variable-length.
The total number of records the catalog expects the data set to contain. This cannot reflect the true number of records. The catalog information is accurate only when data sets are properly closed after updating. If a system crash occurs during updating, the catalog statistics can be inaccurate (this value alone in no way affects the integrity of the cluster). Most database systems using VSAM do not perform normal close operations, so these data sets will rarely have the proper value in the catalog. For the true number of records in the data set, see the TOTAL RECORDS field in the statistical summary of this report. This number is obtained by actually counting the number of records that reside in the data.
CI SPLITS represents the total number of control interval splits that have occurred in the data set.
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