SQLite

2.4.0

Released on 10 Mar 2002
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 2.4.0 Changelog
  • Change the name of the sanity_check PRAGMA to integrity_check and make it available in all compiles.
  • SELECT min() or max() of an indexed column with no WHERE or GROUP BY clause is handled as a special case which avoids a complete table scan.
  • Automatically generated ROWIDs are now sequential.
  • Do not allow dot-commands of the command-line shell to occur in the middle of a real SQL command.
  • Modifications to the "lemon" parser generator so that the parser tables are 4 times smaller.
  • Added support for user-defined functions implemented in C.
  • Added support for new functions: coalesce(), lower(), upper(), and random()
  • Added support for VIEWs.
  • Added the subquery flattening optimizer.
  • Modified the B-Tree and Pager modules so that disk pages that do not contain real data (free pages) are not journaled and are not written from memory back to the disk when they change. This does not impact database integrity, since the pages contain no real data, but it does make large INSERT operations about 2.5 times faster and large DELETEs about 5 times faster.
  • Made the CACHE_SIZE pragma persistent
  • Added the SYNCHRONOUS pragma
  • Fixed a bug that was causing updates to fail inside of transactions when the database contained a temporary table.