Service level agreement (SLA) in a cloud based information systems

With this paper we show through example how to determine acceptable response time of information system (IS) as part of Service level agreement (SLA) in cloud based information systems (CBIS) for randomly selected requirements and hardware infrastructure. IS which we analyzed is implemented on three different database management systems (DBMS): MS SQL Server - as commercial relational database management system (RDBMS), MySQL Server - as open source RDBMS and MongoDB - as open source document oriented DBMS. Our analysis includes databases from different areas regarding implementation and license and is not directly related to the hosting mechanism. Analysis is based on cloud hosted DBMS(s). Response times for different databases are compared in order to determine the most convenient DBMS which can be used for implementation of any cloud based IS. We show that open source DBMS(s) are acceptable replacement for commercial DBMS(s) and cloud based IS is much cheaper and easier to implement than IS hosted in local private IS infrastructure.