Diluting ACID
Tim Kempster, Colin Stirling, Peter Thanisch · ACM SIGMOD Record · 1999
Several DBMS vendors have implemented the ANSI standard SQL isolation levels for transaction processing. This has created a gap between database practice and textbook accounts of transaction processing which simply equate isolation with serializability. We extend the notion of conflict to cover lower isolation levels and we present improved characterisations of classes of schedules achieving these levels.