HP System Dictionary/XL Utilities Reference Manual - Part 1 SDDBD (32256-90003)

Chapter 8 75
Schema Generation Process
Database
Data Sets
SDDBC gets the data sets and all related data items within each data set from System
Dictionary as described previously under “Items”. Based upon the ORDER option, the data
sets are generated in the order of either AUTOMATIC, MANUAL, and DETAIL, or in the
order of retrieval. If data sets are generated by set type order, within each type they are
generated in the order they were retrieved. The order of the items in the data set is
determined by the relationship-position attribute in the RECORD contains ELEMENT
relationship. The search item, master set name and sort item name of a DETAIL data set
is obtained from five-way chain relationships image-dataset, element, element,
image-dataset, image-database. The attribute primary-flag in this chain relationship
indicates whether it is a primary path or not. Through this chain relationship, the path
count for the search item in MASTER sets is also obtained. The search item of a MANUAL
master set is identified by the image-dataset key element relationship.
To get the read and write class lists for each data set, SDDBC searches the
IMAGE-DATASET contains IMAGE-CLASS relationships. The class list is appended next
to the data set name in the set part of the schema.
SDDBC supports TurboIMAGE creations by generating the device class if defined in the
dictionary for the data set header line. This information is retrieved from the
IMAGE-DATASET uses DEVICE-CLASS relationship.
The capacity of a data set is obtained from the attribute capacity of IMAGE-DATABASE
contains IMAGE-DATASET.