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Static aspects of databases have been extensively studied usmg the formal framework of the relatlonal model More recently, some dynamic aspects have been consldered m several mvestlgatlons [AV3, B, CCF, CW, DAZ, FUV, Uh, V] However, there have been few theotretlcal studies of database updates and transactlons Indeed, most mvestlgatlons of transactlons have focused on concurrency issues IBG, PBR] In /AVl, AV2], a formal model of transactlons m relational databases was Introduced, and several basic results on transaction equivalence and optlmlzatlon were obtained In the present paper we use the framework developed m [AVl, AX?] to obtam further results on transactlon equivalence Specifically, we exhlblt a sound and complete axlomatlzatlon for transactlon equivalence, and obtain a simple set of simplification rules for transactions

Axiomatization and simplification rules for relational transactions