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<p><it>Abstract</it>—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 “fragment chain” for each relation involved in the query, CASE-DB initially obtains a response to a modified version of the query and then uses an “iterative query evaluation” 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 “risk control technique.”</p>
Databases, real-time databases, query processing, query modification, relational databases.
Gultekin Ozsoyoglu, Wen-Chi Hou, Kaizheng Du, Sujatha Guruswamy, "Time-Constrained Query Processing in CASE-DB", IEEE Transactions on Knowledge & Data Engineering, vol. 7, no. , pp. 865-884, December 1995, doi:10.1109/69.476494
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