Cdb-library Version 2.6 Final Guide

The cdb-library (often referred to as libcdb ) is the reference implementation, written in portable C. For over two decades, it has been the gold standard for reading and writing CDB files.

Release Date: October 26, 2023 (Projected Archive) Maintainer: Michael Tokarev / Open Source Community Archives cdb-library version 2.6 final

| Operation | CDB 2.5 | CDB 2.6 final | GDBM 1.23 | LevelDB (read only) | |-----------|---------|---------------|-----------|---------------------| | Sequential write (build) | 11.2 sec | 10.8 sec | 18.4 sec | 24.1 sec | | Random lookup (cache cold) | 0.8 µs | 0.8 µs | 2.3 µs | 1.9 µs | | Random lookup (hot cache) | 0.12 µs | 0.12 µs | 0.45 µs | 0.3 µs | | Memory footprint (idle) | ~8 KB | ~8 KB | 2.1 MB | 15 MB | The cdb-library (often referred to as libcdb )

mkdir build && cd build cmake -DCMAKE_BUILD_TYPE=Release .. make && sudo make install Package maintainers: The tarball signature ( cdb-2.6.tar.gz.asc ) is signed with Michael Tokarev’s GPG key (fingerprint B3A5 1F17 045E 3C6A 0DC3 D96A A7C4 F6B6 6B2C 476F ). The maintainers have announced that 2.6 final will be the last feature release of the original cdb-library . From here, only security patches and critical bug fixes will be backported. Why? Because the format has reached perfection for its use case: extremely fast reads, atomic replacement via cdb_make , and zero runtime dependencies . make && sudo make install Package maintainers: The

If you work with high-performance, read-intensive datasets on Unix-like systems—specifically in embedded environments, DNS servers (like PowerDNS or djbdns), or email routing systems—you likely already know the name CDB . Constant DataBase (CDB) is a fast, reliable, and lightweight format for creating and reading immutable key-value stores. After nearly two years of release candidates and meticulous fine-tuning, the team behind the cdb-library project has officially rolled out .