Released on 7 Dec 2009
Project description.

SQLite is an in-process library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. The code for SQLite is in the public domain and is thus free for use for any purpose, commercial or private. SQLite is the most widely deployed database in the world with more applications than we can count, including several high-profile projects.

SQLite is an embedded SQL database engine. Unlike most other SQL databases, SQLite does not have a separate server process. SQLite reads and writes directly to ordinary disk files. A complete SQL database with multiple tables, indices, triggers, and views, is contained in a single disk file. The database file format is cross-platform - you can freely copy a database between 32-bit and 64-bit systems or between big-endian and little-endian architectures. These features make SQLite a popular choice as an Application File Format.

SQLite 3.6.21 Changelog
  • The SQL output resulting from sqlite3_trace() is now modified to includethe values of bound parameters.
  • Performance optimizations targeting a specific use case froma single high-profile user of SQLite. A 12% reduction in the number ofCPU operations is achieved (as measured by Valgrind). Actual performanceimprovements in practice may vary depending on workload. Changesinclude:
    • The ifnull() and coalesce() SQL functions are now implementedusing in-line VDBE code rather than calling external functions, so thatunused arguments need never be evaluated.
    • The substr() SQL function does not bother to measure the lengthits entire input string if it is only computing a prefix
    • Unnecessary OP_IsNull, OP_Affinity, and OP_MustBeInt VDBE opcodesare suppressed
    • Various code refactorizations for performance
  • The FTS3 extension has undergone a major rework and cleanup.New FTS3 documentation is now available.
  • The SQLITE_SECURE_DELETE compile-time option fixed to make sure thatcontent is deleted even when the truncate optimization applies.
  • Improvements to "dot-command" handling in theCommand Line Interface.
  • Other minor bug fixes and documentation enhancements.