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| == riak ==
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| Riak, a scalable and reliable data store, is available in Fedora 15.
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| Riak is a Dynamo-inspired key/value store, written in Erlang, that scales predictably and easily. Riak also simplifies development by giving developers the ability to quickly prototype, test, and deploy their applications.
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| A truly fault-tolerant system, Riak has no single point of failure. No machines are special or central in Riak, so developers and operations professionals can decide exactly how fault-tolerant they want and need their applications to be.
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| == mysql ==
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| {{package|mysql}} has been updated to version 5.5.10. Included are improved scalability and performance. From the release announcement: ''"Higher availability: New semi-synchronous replication and Replication Heart Beat improve failover speed and reliability."''
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| This update includes increasing the shared library version number of libmysqlclient, so applications using that library will need to be recompiled.
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| http://www.mysql.com
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| == postgresql ==
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| {{package|postgresql}} has been updated from 8.4.7 to 9.0.3. In addition to numerous security and other bugfixes, this release contains a number of new features:
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| * Built-in replication, based on log shipping, supports multiple read-only slave servers
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| * Easier database object permissions management
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| * Broadly enhanced stored procedure support
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| * More advanced reporting queries
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| * New trigger features
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| * Deferrable unique constraints
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| * Mass updates to unique keys are now possible without trickery
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| * Exclusion constraints
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| * New and enhanced security features
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| * New high-performance implementation of the LISTEN/NOTIFY feature
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| * New implementation of VACUUM FULL
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| * Multiple performance enhancements for specific types of queries, including elimination of unnecessary joins
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| * EXPLAIN enhancements
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| * hstore improvements
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| In addition, there is a new contrib module pg_upgrade to support in-place upgrades from 8.4 to 9.0. This means that you can upgrade from a Fedora 12 or later database without a database dump and restore. To do that, install the postgresql-upgrade package and run '''service postgresql upgrade''' as root. It's advisable to have a separate backup in case of trouble, but the actual database conversion requires only a few minutes with this approach.
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| {{admon/warning|Incompatible Changes|
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| Version 9.0 contains a number of changes that selectively break backwards compatibility in order to support new features and code quality improvements. Refer to the release notes at http://www.postgresql.org/docs/current/static/release-9-0.html}}
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