Method and apparatus for achieving an enforced and valid constraint state
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United States of America Patent
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May 4, 1999
Grant Date -
N/A
app pub date -
Aug 7, 1996
filing date -
Aug 7, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus are disclosed for enabling a constraint without prohibiting updates to the constrained data during the validation portion of the enablement process. A constraint is first enforced. While the constraint is being enforced, the pre-existing data are inspected to determine whether the constraint is valid. Because the constraint is in force for all changes to the data during the validation process, the constraint will be enabled if the pre-existing data conforms with the constraint. A serialization value is stored in the constraint definition. Whenever the constraint definition is changed, the serialization value is changed. The serialization value of a constraint definition is recorded before validating the constraint. After validating the constraint, the serialization value in the constraint definition is compared to the recorded serialization value to determine whether the constraint definition was changed during the validation process.
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