Data Fusion - Continuous Availability
Data Fusion - integrating complex data from multiple sources
Continuous Availability
Objectivity provides continuous availability through a combination of features
that work together to minimize downtime due to system maintenance,
application upgrades or faults in hardware, network or system software.
On-line administration - Objectivity/DB allows full and incremental backups
to be performed without interrupting applications. Other tools permit movement
of databases and on- line partitioning and repartitioning of federated
databases across platforms.
Active Schema Option allows applications to access, change and add object class definitions. It even allows C++ applications to create new classes and start manipulating object instances without compiling code. This can add considerable flexibility to the configurability of systems to suit local conditions. Fault Tolerant Option is designed to guarantee database availability in networked environments, where databases are distributed across computers. Faults at a database site are isolated and do not affect other databases. The Fault Tolerant Option is complementary to hardware solutions implemented with fault-tolerant processors and redundant disk (e.g. RAID).
Data Replication Option (DRO) permits on-line creation and deletion of database replicas. Made possible by Objectivity's underlying distributed architecture, DRO represents a dramatic advance in replication technology based on academic research performed in the early 1990's. Dynamic uorum (majority vote) calculations guarantee system integr ity without constraining write access to one database master. To guarantee data integrity across replicas, the database manager performs a quorum calculation when it accesses a database. Portions of the federated database disconnected from the quorum are resynchronized with the quorum upon reconnection. As an example, data replication used inside a routing application can provide hotfailover in the case of platform failure and automatic resynchronization of data after the problem is corrected. Data replication across a WAN allows one time delivery of processed data to back-office applications or a carrier’s partners.
