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ChronicDB v1.0 for production: Live schema updates with no downtime

From: ChronicDB <info(at)chronicdb(dot)com>
To: pgsql-announce(at)postgresql(dot)org
Subject: ChronicDB v1.0 for production: Live schema updates with no downtime
Date: 2010-05-03 17:07:18
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-announce

We would like to announce that the first version
of ChronicDB[1], which supports PostgreSQL, is
available for production. ChronicDB is the only
technology that applies live database schema
updates with no downtime[2].

A distinguishing feature of ChronicDB is that it
provides lock-free semantic schema changes[3].
Such changes are not possible with a traditional
ALTER TABLE statement, because that statement
locks a table for write access.

Another key feature is that, after a schema
change, the code of an application does not need
to be modified: ChronicDB allows the old version
of the application and the new version to execute
concurrently over the same database without
breaking the old application. This is accomplished
with live redirection and query rewriting. The
benefit of having multiple application versions
execute is that it is not necessary to plan for a
switchover time after which all old application
clients would no longer work. Instead, an IT group
can have unlimited time for a transitional period,
and the option to revert a change if necessary.

ChronicDB is available for a 45-day evaluation[4]
and for purchasing[5]. Additionally, we rely on
open source components to deliver ChronicDB and
offer ChronicDB free for open source projects[6].

We want to hear from you[7]. We welcome
feedback[8], and feature requests will be
seriously considered for incorporation into our
product. We aim for ChronicDB to fill a necessary
gap in managing live database updates with a fully
automated, and safe, solution.


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