Sudan - Khartoum

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Replication Strategies in Mobile Databases
Yahia Mahgoub Yahia, Mohamed Elamin Mohamed, Abd Allah Ibrahim, and Ayman Suliman

Abstract - With the revolution of mobile computing today mobile devices have become part of each person life lead to a wireless computing environment. Mobile computing has enabled the introduction of new applications, ranging from simple ones such as mobile games to those quite complex applications such as mobile banking and mobile multimedia. With these applications people become have access to information anywhere. With data being distributed in mobile environments it is difficult to employ the currently available database solutions as most of them were developed for the use on the fixed network environment. A new concept of databases has been introduced to address the problem of databases in mobile environments. As devices being disconnected for such time they require local copies of their important data items, since they are often disconnected from their home network. As a result of mobile databases and keeping local copies of databases users need to synchronize their local copies with each other to keep consistency of data among them. Index Terms - Mobile Host (MH), Fixed Host (FH), Transaction, Replication, Synchronous, Asynchronous, Mobile Databases.

Replicating data at servers increases the local availability of the data thereby resulting in an overall reduction of computing cost in a mobile environment. With multiple copies of data on different database servers, replication protects a database from the loss of a single server. With additional copies of the data, it’s possible to dedicate one to disaster recovery, reporting, or backup. II. LITERATURE REVIEW

A. Terms and Concepts In this section we explain some terms and concepts to be used throughout this paper. 1) Mobile Environment: Mobile environments consists of number of…...

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