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## Recent News

### 2011-February-01 - Version 3.7.5

SQLite version 3.7.5 is a regularly scheduled bi-monthly maintenance release of SQLite. Due to the discovery and fix of an obscure bug that could cause database corruption, upgrading from all prior releases of SQLite is recommended. This bug was found during code review and has not been observed in the wild.

This release adds new opcodes for the sqlite3_db_status() interface that allow more precise measurement of how the lookaside memory allocator is performing, which can be useful for tuning in applications with very tight memory constraints.

The sqlite3_vsnprintf() interface was added. This routine is simply a varargs version of the long-standing sqlite3_snprintf() interface.

The output from sqlite3_trace() interface has been enhanced to work better (and faster) in systems that use recursive extensions such as FTS3 or RTREE.

Testing with Valgrind shows that this release of SQLite is about 1% or 2% faster than the previous release for most operations.

A fork of the popular ADO.NET adaptor for SQLite known as System.Data.SQLite is now available on http://System.Data.SQLite.org/. The originator of System.Data.SQLite, Robert Simpson, is aware of this fork, has expressed his approval, and has commit privileges on the new Fossil repository. The SQLite development team intends to maintain System.Data.SQLite moving forward.

### 2010-December-08 - Version 3.7.4

SQLite version 3.7.4 is a regularly scheduled bi-monthly maintenance release of SQLite. Upgrading from version 3.7.2 and version 3.7.3 is optional. Upgrading from all other SQLite releases is recommended.

This release features full-text search enhancements. The older FTS3 virtual table is still fully supported, and should also run faster. In addition, the new FTS4 virtual table is added. FTS4 follows the same syntax as FTS3 but holds additional metadata which facilitates some performance improvements and more advanced matchinfo() output. Look for further full-text search enhancements in subsequent releases.

Also in this release, the EXPLAIN QUERY PLAN output has been enhanced and new documentation is provided so that application developers can more easily understand how SQLite is performing their queries.

Thanks to an account from the folks at http://www.devio.us/, OpenBSD has been added to the list of platforms upon which we test SQLite prior to every release. That list of platforms now includes:

- Linux x86 & x86_64
- MacOS 10.5 & 10.6
- MacOS 10.2 PowerPC
- WinXP and Win7
- Android 2.2
- OpenBSD 4.7

The previous release of SQLite (version 3.7.3) has proven to be very robust. The only serious issue discovered was ticket 80ba201079 that describes an incorrect query result that can occur under very unusual circumstances. The ticket description contains details of the problem. Suffice it to say here that the problem is very obscure and is unlikely to effect most applications and so upgrading is optional. The problem is fixed, of course, in this release.

### 2010-October-08 - Version 3.7.3

SQLite version 3.7.3 is a regularly scheduled bi-monthly maintenance release of SQLite. Upgrading from version 3.7.2 is optional. Upgrading from all other releases is recommended.

This release adds two new interfaces (really just variations on existing interfaces). The sqlite3_create_function_v2() interface adds a destructor for the application-data pointer. The new sqlite3_soft_heap_limit64() interface allows the soft heap limit to be set to a value greater than 231.

The RTREE extension has been enhanced with the ability to have an application-defined query region. This might be used, for example, to locate all objects within the field of view of a camera.

The 3.7.3 release also includes some performance enhancements, including query planner improvements, documentation updates, and fixes to some very obscure bugs.

### 2010-August-24 - Version 3.7.2

SQLite version 3.7.2 fixes a long-standing bug that can cause the database free-page list to go corrupt if incremental_vacuum is used multiple times to partially reduce the size of a database file that contains many hundreds of unused database pages. The original bug reports together with links to the patch that fixes it can be seen here.

This bug has been in the code for at least a year and possibly longer. The bug has nothing to do with the versions 3.7.1 or 3.7.0 or any other recent release. The fact that the bug was discovered (and fixed) within hours of the 3.7.1 release is purely a coincidence.

The bug is impossible to hit without using incremental_vacuum and is very difficult to hit even with incremental_vacuum. And the kind of corruption that the bug causes can usually be fixed simply by running VACUUM. Nevertheless, because the bug can result in database corruption, it is recommended that all SQLite users upgrade to version 3.7.2 or later.

### 2010-August-23 - Version 3.7.1

SQLite version 3.7.1 is a stabilization release for the 3.7.x series. Other than the filesize-in-header bug that was fixed in version 3.7.0.1, no major problems have been seen in 3.7.0. Some minor corner-case performance regressions have been fixed. A typo in the OS/2 interface has been repaired.

A biggest part of the 3.7.1 release is a cleanup and refactoring of the pager module within SQLite. This refactoring should have no application-visible effects. The purpose was to reorganize the code in ways that make it easier to prove correctness.

The 3.7.1 release adds new experimental methods for obtained more detailed memory usage information and for controlling database file fragmentation. And the query planner now does a better job of optimizing the LIKE and GLOB operators.

This release increases the maximum size of database pages from 32KiB to 64KiB. A database with 64KiB pages will not be readable or writable by older versions of SQLite. Note that further increases in page size are not feasible since the file format uses 16-bit offsets to structures within each page.

### 2010-August-04 - Version 3.7.0.1

SQLite version 3.7.0.1 is a patch release to fix a bug in the new filesize-in-header feature of the SQLite file format that could cause database corruption if the same database file is written alternately with version 3.7.0 and version 3.6.23.1 or earlier. A performance regression was also fixed in this release.

### 2010-July-22 - Version 3.7.0

SQLite version 3.7.0 is a major release of SQLite that features a new transaction control mechanism using a write-ahead log or WAL. The traditional rollback-journal is still used as the default so there should be no visible change for legacy programs. But newer programs can take advantage of improved performance and concurrency by enabling the WAL journaling mode.

SQLite version 3.7.0 also contains some query planner enhancements and a few obscure bug fixes, but the only really big change is the addition of WAL mode.

### 2010-Mar-30 - Version 3.6.23.1

SQLite version 3.6.23.1 is a patch release to fix a bug in the offsets() function of FTS3 at the request of the Mozilla.

### 2010-Mar-09 - Version 3.6.23

SQLite version 3.6.23 is a regular bimonthly release of SQLite. Upgrading from the prior release is purely optional.

This release contains new pragmas: the secure_delete pragma, and the compile_options pragma. There are a new SQL functions: sqlite_compileoption_used() and sqlite_compileoption_get(). New C/C++ interfaces: sqlite3_compileoption_used(), sqlite3_compileoption_get(), SQLITE_CONFIG_LOG, and sqlite3_log().

This release also includes several minor bug fixes and performance improvements. Support for SQLITE_OMIT_FLOATING_POINT is enhanced. There are on-going improvements to FTS3.

The ".genfkey" command in the Command Line Interface has been removed. SQLite has supported standard SQL foreign key constraints since version 3.6.19 and so the ".genfkey" command was seen as an anachronism.

### 2010-Jan-06 - Version 3.6.22

SQLite version 3.6.22 is a bug-fix release. Two bugs have been fixed that might cause incorrect query results.

- Ticket 31338dca7e describes a problem with queries that have a WHERE clause of the form (x AND y) OR z where x and z come from one table of a join and y comes from a different table.
- Ticket eb5548a849 describes a problem where the use of the CAST operator in the WHERE clause can lead to incorrect results if the column being cast to a new datatype is also used in the same WHERE clause without being cast.

Both bugs are obscure, but because they could arise in an application after deployment, it is recommended that all applications upgrade SQLite to version 3.6.22.

This release also includes other minor bug fixes and performance enhancements, especially in the FTS3 extension.

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