Firebird vs RocksDB

Firebird is a free, open-source relational database management system with ANSI SQL features. It runs on Linux, macOS, and Windows, and supports self-hosted deployment. Its multi-generation architecture generally allows readers to access data without blocking writers. SQL features include stored procedures, triggers, common table expressions, cross-database queries, and flexible transaction management. A Trace API and monitoring tables support real-time monitoring, SQL debugging, and auditing. Security controls include users and roles, GRANT and REVOKE permissions, and a database owner concept; Windows Trusted Authentication can integrate with Windows domain or Active Directory security. Deployment choices include embedded, SuperServer, SuperClassic, and Classic architectures. Backup options include online backups and dumps, as well as incremental backup with partly supported point-in-time recovery. Drivers include Java JDBC,.NET, Python, ODBC, PHP, Delphi, and C++ Builder. Free community support is available through mailing lists, alongside commercial and special support. Firebird lists versions 5.0.4, 4.0.7, and 3.0.14 as latest in their series; versions 2.5 and earlier are discontinued and no longer maintained. The enterprise subscription is €199 a month, billed from €199/month/1 servers.

RocksDB is an embeddable, persistent key-value store for applications that need fast storage. It stores keys and values as arbitrary byte arrays, with ordering determined by a comparator chosen by the user. Its log-structured merge design allows configuration of tradeoffs among write, read, and space amplification, and the project describes it as optimized for low-latency storage on flash drives and high-speed disks. The C++ library supports opening and closing databases, reads and writes, merging, and compaction filters. Described uses include database storage engines, application data caches, and embedded workloads. Multi-threaded compactions support databases holding multiple terabytes; the project describes an audience of application servers storing up to a few terabytes on local or remote systems. RocksDB also has a Java wrapper, RocksJava, with artifacts published through Maven. It is free and open source under either GPLv2 or Apache 2.0, at the user's choice. Building requires GCC 11 or later or Clang 10 or later for C++20 support; values must be smaller than 4 GB.