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Heterogeneous systems are usually used when individual sites use their own hardware and software.On heterogeneous system, translations are required to allow communication between different sites (or DBMS).Each site surrenders part of its autonomy in terms of right to change schema or software.
In heterogeneous systems, different nodes may have different hardware & software and data structures at various nodes or locations are also incompatible.
Different computers and operating systems, database applications or data models may be used at each of the locations.
In this system, the users must be able to make requests in a database language at their local sites.
Usually the SQL database language is used for this purpose.
Because distributed databases store data across multiple computers, distributed databases may improve performance at end-user worksites by allowing transactions to be processed on many machines, instead of being limited to one.
A Society Essay - Distributed Databases Thesis
Besides distributed database replication and fragmentation, there are many other distributed database design technologies.
In this paper, we propose an adaptive algorithm that automatically controls the underlying storage system in real-time to meet such an SLA while optimizing the other C/A metric.
We also present an implementation of the algorithm based on the popular key-value store Riak.
Our experiments with the modified system, under realistic workloads, show that the control technique is able to change the system’s configurations to quickly and stably satisfy the SLAs.
It may be stored in multiple computers, located in the same physical location; or may be dispersed over a network of interconnected computers.