|dc.contributor.author||Murillo-Morera, Juan de Dios||
|dc.description||Proyecto de Graduación (Maestría en Computación) Instituto Tecnológico de Costa Rica, Escuela de Ingeniería en Computación, 2014.||es
|dc.description.abstract||The problem of concurrency control in the context of mobile devices has
become an important research topic, since in the current society both cell
phones and tablets, and other devices have been used to perform transactions
such as canceling a receipt phone, buy a movie ticket, consult a bank account.
The behavior of the crowd in mobile environments is a relatively new topic
of study which has characteristics that di↵er from traditional approaches
to database. The turnout in the computing environment appeared with the
birth of operating systems with support for multiprogramming, and became a
useful tool for getting the most out of a computer. Since then the competition
has been applied to various computer applications such as databases, the
Internet and multi-agent systems among others.
Parallel processing and management of large volumes of data are more
common nowadays. Therefore, management of transactions to the device and
between devices through the intervention of a web service is more common.
In turn, there are several issues facing mobile environments transaction level.
For example, frequent disconnections and low bandwidth in mind that sometimes
hinder the proper handling of transactions and endanger both their
integrity and concurrency.
To resolve this situation, have emerged algorithmic proposals which address
the problem of concurrency control in mobile environments. However,
they have always come limitations of any kind, because they use traditional
methods for handling concurrency in mobile environments.
Among the proposals there are some that are characterized as conservative, or holding locks or latches that often are not required, or simply contribute
to a process that leads to a slow transaction processing thus preventing many
transactions arrive to commit.
Conservative proposals are used to manage mobile environments where
the operations are local, thus achieving proper synchronization of these. For
mobile devices, the problem begins in the time database transactions have
not only local but also global, that is, there is a distributed heterogeneous environment.
In situations like the one mentioned is where concurrency control
becomes a difficult issue to resolve, especially when frequent disconnections
The proposed research has the main objective to study the most important
both pessimistic and optimistic algorithms, as well as some nonconservative
representatives to propose a new approach based on the salient
features of the studied streams that can resolve the problem of concurrency
control in environments considering the frequent disconnects.||es
|dc.description.sponsorship||Instituto Tecnológico de Costa Rica.||es
|dc.publisher||Instituto Tecnológico de Costa Rica||es
|dc.subject||Base de datos||es
|dc.title||Modelo para el manejo del control de la concurrencia en ambientes móviles considerando desconexiones frecuentes||es