Um estudo teórico sobre replicação em sistemas de bancos de dados

Abstract

The necessity of the availability of information in shared environment becomes important that the data are not only in a central computer, storing given critical in different sites (different places or us of a net) a system would be available same if some to fail. Another reason is to increase the performance, since a copy of each item of data exists more than, a transaction can find the data that it needs in a next place. In this work a theoretical study on techniques of response of data will be presented, approaching some techniques of immediate response and some algorithms using the project of delayed response, objectifying to stand out the advantages and the costs of each method.