[Hsqldb-developers] HSQLDB and Multiversion Concurrency Control

[fredt <fr...@us...>]

HSQLDB is breaking new ground!

I am pleased to (pre) announce the HSQLDB 1.9.x series, featuring 
Multiversion Concurrency Control.

In this series, all rows involved in transactions include the full change 
history. This allows multi-threaded, non-blocking reads and writes, with 
conflict detection on commit.

The new architecture allows two new transaction isolation modes: Snapshot 
Isolation and Read Consistency Isolation, which are respectively and 
approximately equivalent to Repeatable Reads and Read Committed isolation 
levels. Read Uncommitted will continue to be supported.

The first alpha release of the new series will be available from the file 
download page by the end of the week.

Fred Toussi

Maintainer, HSQLDB Project
http://hsqldb.org