Abstract
In a mobile environment, due to the various constraints
 inherited from limitations of wireless communication
 and mobile devices, checking for integrity constraints to
 maintain the consistent state of mobile databases is an important
 issue that needs to be addressed. Hence, in this paper
 we propose a framework for caching relevant data items
 needed during the process of checking integrity constraints
 of mobile databases. This is achieved by analyzing the relationships
 among the integrity tests (simplified form of integrity
 constraints) to be evaluated for a given update operation.
 This improves the checking mechanism by preventing
 delays during the process of checking constraints and performing
 the update. Hence, our model speeds up the checking
 process.
Highlights
There has been an increasing interest in mobile computing due to the rapid advances in wireless communication and portable computing technologies
In a mobile environment, due to the various constraints inherited from limitations of wireless communication and mobile devices, checking for integrity constraints to maintain the consistent state of mobile databases is an important issue that needs to be addressed
(i) Caching relevant data items – this has achieved two purposes, namely: (i) upgrading the properties of the tests – by caching the relevant data items it increases the possibility of performing the constraints checking locally at the mobile host, as most of the data required are available at the mobile host and (ii) the process of checking the integrity constraints at the mobile host can be performed without delay even if the mobile host is disconnected
Summary
There has been an increasing interest in mobile computing due to the rapid advances in wireless communication and portable computing technologies. By caching the needed data items, it allows mobile host to continue processing without worrying about disconnection Another important issue in databases is consistency, which must be maintained whenever an update operation (insert, delete, or modify) or transaction (sequence of updates) occurs at the mobile host. A framework is proposed where checking the consistency of mobile databases is performed at the mobile host This framework is suitable for both intentional (planned) and unintentional (unplanned) disconnection. This framework differs from the approach proposed in [14] since it is intended to cater for the important and frequently used integrity constraints, i.e. those that are used in database application.
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