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 Three-Level (3-L) model, wherein the process of constraint checking is realized at three different levels. Here, we use sufficient and complete tests together with the idea of caching relevant data items during the relocation period for checking the integrity constraints. This has improved the checking mechanism by preventing delays during the process of checking constraints and performing the update. Also, the 3-L model reduces the amount of data accessed given that much of the tasks are performed at the mobile host. Hence, our model speeds up the checking process.
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