KKL Replication I

PostgresQL is proud of functions those are not inferior to any business purpose RDBMS and its safety.
However, because it doesn’t have replication function, there was a possibility of losing data, which is specially dangerous for mission critical business data that applied PostgreSQL.
We conquest the problem above, implement replication function to PostgreSQL, reduce data loss as much as possible, and release KKL Replication I(KKL Replication one), what makes mission critical business data be able to use on PostgreSQL.

What is replication?

Replication is preserving the same data on multiple servers to duplicate data.KKL Replication I supports real time data duplication between two database nodes (master and slave).

Main features

◇ Develope based on PostgreSQL8.0

KKL Replication I has all advanced features of PostgreSQL8.0.

◇ High safety

With KKL Replication I, data are duplicated real time. Data will be safe even when one machine is broken down.

◇ High availability

With KKL Replication I, database nodes observe each others’ circumstances, damaged node will be automatically detached, operation will switch to the remain node. When broken down node is restored, system will synchronously operate without stopping another node.

◇ Compatibility with existing application

Application that is compatible with general PostgreSQL need very few attention points to switch over to KKL Replication I.

Assumed target fields

• Important business operating online Web system
• Absolute sercurity requested systems, such as First-aid lifesaving, Banking mission critical task

Replication bases on storage

With KKL Replication I, processes before writing data operate on single server, and then duplicate the data written on storage.
Because processes only operate on single server, non-conformance caused by interpretation does not exist. And cost is lower than that of using shared disk method.

Compatible OS

• Red Hat Enterprise Linux v.3 (Intel x86 Edition)
• Red Hat Enterprise Linux v.4 (Intel x86 Edition)
• Solaris 10 OS (SPARC Edition)