The MariaDB Corporation MaxScale is an intelligent proxy that allows forwarding of database statements to one or more database servers using complex rules, a semantic understanding of the database statements and the roles of the various servers within the backend cluster of databases.

MaxScale is designed to provide load balancing and high availability functionality transparently to the applications. In addition it provides a highly scalable and flexibile architecture, with plugin components to support different protocols and routing decissions.

Hibari is a distributed, non-relational database management system (distributed non-RDBMS) based on distributed key value store technology, implemented by Gemini Mobile Technologies, it inherits important characteristics of both the distributed non-RDBMS world and of Gemini's HyperScale® Platform.

Hibari has the following characteristics to flexibly support growing volumes of data in cloud computing space. Economic system build-up using commodity hardware Flexible, high scalability High performance and availability by consistent hashing across multiple machines High fault-tolerance by chain replication across multiple machines Safety without a single point of failure (SPOF)

The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.

Cassandra was open sourced by Facebook in 2008, where it was designed by Avinash Lakshman (one of the authors of Dynamo) and Prashant Malik. In a lot of ways you can think of Cassandra as Dynamo 2.0. Cassandra is in production use at Rackspace, Digg, and a number of other companies, but is still under heavy development.

Have you ever wondered how optimized your Memcached installation is? There is a common misconception that one doesn't have to think too deeply about Memcached performance, but that is not true. If your setup is inefficient, you could:

* Burn Memory
* Waste Network Round-Trips
* Store Keys That Never Get Retrieved
* Have a Low Cache Hit Ratio (i.e. query MySQL too much)
* Suffer a fate too horrible to contemplate.

Percona does a lot of consulting around Memcached, so we try to take a quantitative, scientific approach to measuring memcached performance, just like everything else we do.

The Tungsten Replicator implements open source database-neutral master/slave replication. Master/slave replication is a highly flexible technology that can solve a wide variety of problems including the following:

* Availability - Failing over to a slave database if your master database dies
* Performance Scaling - Spreading reads across many copies of data
* Cross-Site Clustering - Maintaining active database replicas across WANs 
* Change Data Capture - Extracting changes to load data warehouses or update other systems
* Zero Downtime Upgrade - Performing upgrades on a slave server which then becomes the master