Cloudscape 10 from IBM

Cloudscape 10 is an all-Java implementation of a small-footprint, low-administration relational database. It supports most of SQL-92E and parts of SQL-99. It can be accessed through JDBC, has record import/export functions, and a bulk loader. Its capacity for tables and table size are limited by disk space only; and it supports up to 1012 columns per table and 32767 indexes per table. Among the features of enterprise products that it offers are: row-level locking, transaction commitment and rollback, hash joins, query compilation, on-line backup and crash recovery, Unicode support and internationali­zation, encryption, and multiple low-overhead connections.

Apache Derby (Cloudscape 10)