Abstract
Semantic integrity of a database is guarded by a set of integrity assertions expressed as predicates on database values. The problem of efficient evaluation of integrity assertions in transaction processing systems is considered. Three methods of validation (compile-time, run-time, and post-execution validations) are analyzed in terms of database access costs. The results show that if transactions are executed independently of each other, the cost of compile-time validation is never higher than the cost of run-time validation; in turn the cost of the latter is never higher than the cost of post-execution validation.
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