The Apache Derby
project is pleased to announce a new GA feature release
of Derby, 10.5.1.1
Apache Derby is a sub-project of the Apache DB project. Derby is a pure
Java relational database engine which conforms to the ISO/ANSI SQL and
JDBC standards. Derby aims to be easy for developers and end-users to
Derby 10.5.1.1 can be obtained from the Derby download site:http://db.apache.org/derby/derby_downloads.html
It contains the following new features:
- SQL Roles - SQL roles (as described in SQL 2003 and
errata) are useful for administering privileges for groups of users.
Administering roles is generally less error-prone than administering
privileges for individual users. SQL Roles are defined in Feature T331
"Basic roles" and Feature T332 "Extended roles". Derby 10.5 implements
a subset of T331, plus support for CURRENT_ROLE, which is a part of
- Generated Columns - Generated Columns is a feature
which instructs Derby to fill a column with an expression built out of
other columns in the row. Derby constructs these column values at
INSERT and UPDATE time. The user declares indexes on these columns.
This in turn improves SELECT performance since it lets users declare
indexes on pre-computed pieces of the WHERE clause. This feature
satisfies support for SQL Feature T175.
- LOB Improvements - There were many performance and usability improvements for BLOBs and CLOBs.
- Replication of encrypted databases - With 10.5 it is possible to replicate encrypted databases.
- OFFSET/FETCH FIRST - SQL 2008 has added new syntax to
support a direct way to limit the returned set of rows in a result set,
through the fetch first and offset clauses.
- In-Memory back end - Initial implementation of a
storage engine for Derby where all data is kept in memory. There is no
documentation for this feature. This functionality itself is not yet
fully implemented, but users are welcome to experiment with it. For
details, see the Primer for In-memory Back Ends.
- Standard ALTER COLUMN syntax - Allow standard SQL
"SET" keyword in ALTER COLUMN syntax, like so: "ALTER TABLE ALTER
COLUMN columnname SET DEFAULT default-value"
- SYSCS_UTIL.SYSCS_UPDATE_STATISTICS - New system
procedure that updates cardinality statistics (or creates them if they
do not exist) for a table's index or for all the indexes on a table,
allowing a user to ensure that a query plan based on the most recent
state of the table can be created.
In addition, Derby 10.5.1.1 contains many bug and documentation fixes.
Java DB, which is Sun's distribution of Apache Derby should be available as a 10.5.1.1 release level very soon.