The Research Of Date Replication Based On Distributed Database

With widely using of the distributed database which is a combination of database and network technology, the data inconsistency problems caused by distribution of the geographical position usually occur. In solving these problems, the data duplicate technology presents its outstanding advantages and being widely used. Thus, has been a hot focus in the database technology research field now.Data replication technology publishes the publication which is defined by the publishing database to other subscribing databases, provides a quick and efficient way to release information in distribution environment. The remote users can take their distributed operation on the replicas locally and cut down the load of network and center database server, so operations had been carried by users may also pull back to the center database. Available means for data collection and database backup are provided.On analyze and research of the base concept, system structure, schema structure of distributed database, besides transaction manager on distributed database system and data replication technology, the data conflict and data replication ways of popular database manager systems (DBMS) such as Oracle, MS SQL Server, Sybase, DB2, My SQL are contrasted, and a model are put in practice to the widely used relax-consistent mode by putting forward a data replication method based on modified timestamps of data records.Therefore, the problem about how to estimate the consistence between ectypal and host data under the physical linking route failure is solved. It was suggested that the modified loose-consistent mode based on perfection timestamps of data records is practical.