MIDAS: A Middleware for Information Systems with QoS Concerns

One of the most difficult tasks in the design of information systems is how to control the behaviour of the back-end storage engine, usually a relational database. As the load on the database increases, the longer issued transactions will take to execute, mainly because the presence of a high number of locks required to provide isolation and concurrency. In this paper we present MIDAS, a middleware designed to manage the behaviour of database servers, focusing primarily on guaranteeing transaction execution within an specified amount of time (deadline). MIDAS was developed for Java applications that connects to storage engines through JDBC. It provides a transparent QoS layer and can be adopted with very few code modifications. All transactions issued by the application are captured, forcing them to pass through an Admission Control (AC) mechanism. To accomplish such QoS constraints, we propose a novel AC strategy, called 2-Phase Admission Control (2PAC), that minimizes the amount of t...

• Type: Conference
• Year: 2009
• Where: ICEIS
• Authors: Luís Fernando Orleans, Geraldo Zimbrão
• Keywords: Admission Control, ICEIS 2009, Information Systems, Longer Issued Transactions, Storage Engines