Get the SourceForge newsletter. Oracle Berkeley DB Java Edition is an open source, embeddable, transactional storage engine written entirely in Java. Berkeley DB offers advanced features including transactional data storage, highly concurrent access, scalability on large SMP systems, replication for high availability, and fault tolerance in a self-contained, small footprint software library. Oracle Berkeley DB is a family of embedded key-value database libraries providing scalable high-performance data management services to applications. Get notifications on updates for this project. Get newsletters and notices that include site news, special offers and exclusive discounts about IT products & … The dbm interfaces to the Berkeley DB library are intended to provide high-performance implementations and source code compatibility for applications written to historic interfaces. For example, whenever Berkeley DB accesses a cached page, it first pins the page in memory. My db type of choice is HASH but I also tried BTREE and it is the same. Generally, the speed of a database system is measured by the transaction throughput, expressed as the number of transactions per second.The two gating factors for Berkeley DB performance in a transactional system are usually the underlying database files and the log file. In some cases, better performance can be achieved by configuring with the --with-mutex argument and selecting a different mutex implementation than the one selected by Berkeley DB. Berkeley DB provides a simple function-call API for data access and management. It takes full advantage of the Java environment to simplify development and deployment. I tried using a pool of 10 db's and hashing the docs among them to smooth out the performance drops; this increased the write throughput to 50K docs/s but didn't help with the performance drops: all 10 db's slowed to a crawl at the same time. Write and Read are concurrent for the db, but write performs best with single thread whereas Read scales with number of cores. At the beginning, when the quantity of data was low, the insertion of new rows was fast. Slices in Berkeley DB(courtesy of Charles Koester) With the new Berkeley DB 6.2 release, there are a number of new features. They are not recommended for any other purpose. The software is distributed as a library that can be linked directly into an application. One of the more exciting ones is the use of Slices.It is possible to improve the multiprocessor scaling of your DB databases by implementing slices. Berkeley DB is an Open Source embedded database library that provides scalable, high-performance, transaction-protected data management services to applications. There are other performance implications that result from the underlying assumption that the in-memory representation of Berkeley DB indices is really a cache for on-disk persistent data. 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