Progress
Programming
Handbook
Database CRCs and Time Stamps
At run time, Progress must ensure that r-code files and the database(s) that they access are compatible. Otherwise, if the schema has changed since the code was compiled, running the code might damage the database. Progress supports two techniques for checking this compatibility—time stamp validation and cyclic redundancy check (CRC) validation. Each technique prevents you from running unauthorized or data-incompatible procedures against a particular database environment.
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