doc.Index.index.uim.repl

Replication strikes a balance between presenting consistent data and not depending on a single centralized location for all IS needs.

Virtuoso offers a range of tools and technologies for replicating and synchronizing data between different servers. These technologies are suited for a wide variety of distributed IS needs, including:

• Two-way replication of tables, involving a Virtuoso hub sharing data between a group of MS SQL Server, Oracle or DB2 databases. The Virtuoso will initiate data transfer and resolve possible update conflicts.
  
• Disseminating periodically changing data between heterogeneous relational databases. Almost any ODBC/JDBC accessible database can be a source or recipient of such data.
  
• Keeping Virtuoso DAV repositories in sync between Virtuoso installations.
  
• Keeping Virtuoso servers in real-time sync for load balancing or hot standby situations. This is based on real-time log shipping, thus will also work for intermittently connected systems.
  
• Sharing mobile data through SyncML? . The Virtuoso SyncML? server has pluggable logic for format conversions between common mobile formats such as Vcard and Vcalendar.
  All these technologies function reliably in either a constantly or intermittently connected network. Nodes will bring themselves up-to-date automatically upon reconnect or recovery, requiring minimal administration.

A web based interface or SQL statements are used for defining publications and subscriptions and synchronization intervals.

SyncML? 1.0