Java DB 10.4.2.1
Java DB 10.4.2.1 is a bug fix release.
Java DB 10.4 introduces some significant features:
Asynchronous replication with manual failover allows you to maintain an up to date copy of your (master) database on a different host (the slave). In the case of a crash on the master database you can perform failover to the copy (slave database) and continue serving client requests against your database. The section titled "Replicating databases" in the Server and Administration Guide has more information.
Table functions let you slice, dice, and zipper together external data. Using table functions and standard SQL, you can pose sophisticated queries against in-memory collections, flat files, web resources, non-relational databases, etc. Table functions also let you efficiently import data from web feeds, sensor logs, and other relational databases. For more information, please see the section titled "Programming Derby-style table functions" in the Developer's Guide.
Java Management Extensions (JMX) for Java DB, allowing local and remote monitoring and management of running Java DB instances (embedded or Network Server). You can use graphical tools such as JConsole or VisualVM to access Java DB's MBeans. You can also write your own Java code to do the same, using standard JMX APIs.
Java DB 10.4 also brings performance boosts (better scalability on multi-core machines, network client caches), additional SQL capabilities (unique constraints on nullable columns, limit/offset) and usability improvements (bracketed comments, ij continuation markers).
Java DB 10.4.2.1 adds localizations for new messages introduced in the previous feature release, 10.4.1.3. In addition, Java DB 10.4.2.1 contains many bug fixes, including improvements to large object access, UNION queries, pooled connections, function arguments, metadata access, and statement caching.
Java DB 10.4.2.1 is produced from a snapshot of Apache Derby's 10.4 stable branch and contains some extra bug fixes compared to Java DB 10.4.2.0.
For more details, please see the New Features and Release Notes references below.
Previous Releases:
