This guide provides the official download links, technical features, and critical security warnings for developers and system administrators still maintaining legacy applications.
The Firebird Project continues to host the final 1.5.6 binaries for archival purposes. You can find them at the following official sources:
: The Firebird 1.5 Release Page contains the full suite of installers. download firebird 1.5
: Added support for SQL-92 conditional expressions such as CASE , COALESCE , and NULLIF .
Released in 2004, Firebird 1.5 was the first version to be fully ported from the original C codebase to , resulting in a 30% to 60% performance improvement. This guide provides the official download links, technical
: Enabled a single trigger to handle INSERT , UPDATE , and DELETE actions simultaneously.
: Increased the maximum number of indexes per table from 64 to 256 . Critical Security Alert Firebird 1.5.6 Release Notes : Added support for SQL-92 conditional expressions such
: Introduced the Embedded Server (a single DLL for stand-alone apps) and the Classic Server model for Windows, which allowed for better multi-processor utilization.