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Sort Sequence for Lock Descriptors [ TurboIMAGE/XL Database Management System Reference Manual ] MPE/iX 5.0 Documentation


TurboIMAGE/XL Database Management System Reference Manual

Sort Sequence for Lock Descriptors 

TurboIMAGE/XL internally sorts the lock descriptors in the order as
follows:

   *   Ascending data set number

   *   Lower bound of data item value for each data set number

If a lock descriptor's relative operator (relop) field contains <=, it
collates before any other lock descriptors for the data set because it
has the lowest possible lower bound for its value.  For example, a lock
descriptor of SALES:QUANTITY <= 10 collates before a lock descriptor of
SALES:QUANTITY = 5, because the lower bound of the former is the lowest
possible integer for an I-type data item.



MPE/iX 5.0 Documentation