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CASE-DB is a real-time, single-user, relational prototype DBMS that permits the specification of strict time constraints for relational algebra queries. Given a time constrained nonaggregate relational algebra query and a 驴fragment chain驴 for each relation involved in the query, CASE-DB initially obtains a response to a modified version of the query and then uses an 驴iterative query evaluation驴 technique to successively improve and evaluate the modified version of the query. CASE-DB controls the risk of overspending the time quota at each step using a 驴risk control technique.驴