This chapter gives an overview of the design and implementation of the Ariel active DBMS. The query language of Ariel is a subset of POSTQUEL, extended with a new production-rule sublanguage. The Ariel rule system is tightly coupled with query and update processing. Ariel rules can have conditions based on a mix of selections, joins, events, and transitions. For testing rule conditions, Ariel makes use of a discrimination network composed of a special data structure for testing single-relation selection conditions efficiently, and a modified version of the TREAT algorithm, called A-TREAT, for testing join conditions.
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