The full InfinityDB 4 trial edition, most recent version.
InfinityDB is a Java embedded DBMS with a unique very fast, extremely flexible and simple API based on an ‘ItemSpace’, along with a wrapper to make the model accessible as a Java ConcurrentNavigableMap. It has optimistic transactions, data compression, multi-core concurrency, rugged I/O without a log, instant restart, a single-file data store, easy backwards data structure compatibility without upgrade scripts, and zero installation management effor. Developer productivity is almost instant. There are many utilities and example code.
Version 4 now includes standard Java Microbenchmarking Harness performance tests, showing its tremendous in-memory performance characteristics.
After the trial period ends, an Exception is thrown on initialization.