Database set condition test instruction

Details Database set condition test instruction Database set condition test instruction

1975-06-19

1977-08-16

Shaw, Gareth D.

Boots, shoes, and leggings

364300, G06F 910, G06F 916, G06F 920, G06F 1300

Patent

active

040429121

ABSTRACT:
Two of a series of hardware/firmware primitives are disclosed for converting a general purpose digital computer into a database machine. The invention comprises two hardware firmware implemented machine instructions which both fetch a set descriptor, which along with a base register BR, allow access to a record. For the Test Set Empty operation, the record accessed is an owner record and a check is made to see whether the set has any member records currently associated with it. For the Test Member Inserted operation, the record accessed is checked to see whether it is currently inserted as a member of a particular set (i.e., a part of that set).

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