Oracle has released version 4.5 of BerkeleyDB, the embedable database it acquired in February.

New features include multi-version concurrency control for databases often accessed by many users at once, the ability to install upgrades and patches in replicated BerkeleyDB environments without taking the database off-line, and a pre-built replication environment for easier deployment of high-availability systems, said Oracle's head of embedded systems, Rex Wang.

The previous update to BerkeleyDB was released a year ago. The free database meanwhile has been deployed more than 200 million times, including in the Linux and BSD Unix operating systems, the Apache Web server, OpenLDAP directory and OpenOffice productivity suite.

The database was struck a blow recently however, when MySQL quietly dropped support for BerkeleyDB in August.