FIXED END TIMEOUT TECHNIQUE (FETOT) FOR PLANNED DISCONNECTION IN MOBILE DATABASE OVER FIXED NETWORK WITH WEIGHTED DATA DISTRIBUTION

摘要

Data Allocation can be used to improve data availability in distributed database environments. In such a system, a mechanism is required to distribute the data (allocate it) to the system nodes in the mobile or fixed network and to maintain the consistency of the data. The high increase for working in the disconnected mode leads to develop some models that handle the transactions during the connection, disconnection, and reconnection mode and that models have to able to manage the two networks: the fixed and the mobile network to act as peer to peer network. Most of the transaction management which using the Time-out based still suffering from the long time to get the last consistent database copy, and most of the transaction management models didn't pay attention to the data distribution between the fixed network and the mobile network according to the neediness for the data, so that model distribute the data equally between the two networks even one of the networks need more data than the other. In this paper we will focus on proposing The Fixed End Timeout Technique (FETOT) for planned disconnection in mobile database over fixed network with weighted data distribution, a model will connect between the mobile network and the fixed network; we are proposing a new method to: (1) Mange the data in the fixed network and the mobile network at the same time. (2) Reduce the delay in the total commit time for the timeout-based models. (3) Allocate the data to the mobile and fixed network according to the neediness by using weight factor.