In ubiquitous data applications, local data replicas are often essential for mobile users to get more reliable and faster access. Referring to the open source-code resource Sync4j for a data synchronization solution of lower price, we design and implement an application-independent SyncML-complied middleware, named GSMS, to synchronize data between heterogeneous Relational Database Management Systems (RDBMSs), which is featured with no interference in the data relation schemas and program logics of existent applications. The performance stability of GSMS is verified through synchronization experiments on different combinations of prevalent RDBMS.
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