Adaptive real-time transactions and risk-based load control
Erdoğan Doğdu, Gültekin Özsoyoğlu · 1997
An extended transaction model, ~ the Adaptive Transaction Model, is proposed for Real-Time Database Management System (RTDBMS) appfications where partial and/or approximate results are utilized.The Adaptive Transaction Model is a nested transaction model with optional and required subtransactions.Adapfive Transactions (ATs) have time constraints to support real-time dm~hase appfications.Optional subll'nnsncfions con be eJiminated during execution if time (or the scheduling poficy) does not perrnit for completion, thereby reporting partial results.A risk-based transaction load control mechanism determines each transaction's probability of completion within its deadline as well as the overall system load.