Berkeley DB (BDB) is a software library that provides a high-performance embedded database for key/value data. As of 2012, Berkeley DB is the most widely used database toolkit in the world, with hundreds of millions of deployed copies. Berkeley DB is written in C with API bindings for C++, PHP, Java, Perl, Python, Ruby, Tcl, Smalltalk, and most other programming languages. BDB stores arbitrary key/data pairs as byte arrays, and supports multiple data items for a single key. Berkeley DB is not a relational database. BDB can support thousands of simultaneous threads of control or concurrent processes manipulating databases as large as 256 terabytes, on a wide variety of operating systems including most Unix-like and Windows systems, and real-time operating systems. Berkeley DB is also used as the common name for three distinct products; Oracle Berkeley DB, Berkeley DB Java Edition, and Berkeley DB XML. These three products all share a common ancestry and are currently under active development at Oracle Corporation.
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“It seems, Euphranor..., that there is nothing so singularly absurd as we are apt to think, in the belief of mysteries; and that a man need not renounce his reason to maintain his religion. But if this were true, how comes it to pass, that, in proportion as men abound in knowledge, they dwindle in faith?”
—George Berkeley (1685–1753)