Dynamic query optimization on a distributed object management platform
Fatma Özcan, Sena Nural, Pınar Köksal, Cem Evrendilek, Asuman Doğaç · 1996
A DistributedObject Management (DOM) architecture, when used as the infrastructure of a multidatabase system, not only enables easy and flexible interoperation of D13MSS, but also facilitates interoperation of the multidatabase system with other repositories that do not have DIBMS capabilities.Thk is an important advantage, since most of data still resides on repositories that do not have DIBMS capabilities.In thk paper, we describe a dynamic query optimization technique for a multidatabaae system, namely MIND, implement ed on a DOM environment.Dynamic query optimization, which schedules intersite operations at runtime, fits better to such an environment since it benefits from location transparency provided by the DOM framework.In thk way, the dynamic changes in the configuration of system resources such as a relocated DBMS or a new mirror to an existing DBMS, do not affect the optimized query execution in the system.Furthermore, the uncertainty in estimating the appearance times (i.e., the execution time of the global @ 199(j ACM @89791 +73+/9fj/l 1 ..$3 .5~117 experiments indicate that the dynamic query optimization technique presented in thk paper has a better performance.