ChronicDB: Live database schema updates with zero downtime

Dear PostgreSQL Users,

We would like to announce a new technology called
ChronicDB[1] that aims to update databases (both
their data and their schemas) while they are
running live, without bringing the database down
at all.

The main focus of ChronicDB is to completely
eliminate downtime in the presence of database
schema changes. If a database schema is upgraded
to a new version that is not backward compatible
with the old version, ChronicDB will allow running
both the old version and the new version of the
database applications against the same version of
the database schema until a database update
completes. This means you don't have to upgrade
all your client applications at the same time to
be able to use the new version of the database. If
during or after an update you are dissatisfied
with the new version of the application, ChronicDB
can reverse the database to the old version if the
semantics of the application allow it.

Some features that ChronicDB provides without
bringing the database down are:
- Lock-free schema changes
- Automated migration
- Database relocation
- Uninterrupted data access
- Hot backups and fault tolerance

A noteworthy feature planned for our next release
is support for structural schema changes, such as
partitioning fields or moving fields from one
table to another.

We would like to invite you to learn more about
ChronicDB[2] and to evaluate free, supported,
pre-release versions of ChronicDB for PostgreSQL
7.4 and 8.x through our early adoption program[3].

Sincerely,
ChronicDB Team

[1] http://chronicdb.com
[2] http://chronicdb.com/chronicdb_why
[3]
http://chronicdb.com/chronicdb_early_adoption_program