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## SQLite Release 3.3.14 On 2007-04-02

1. Fix a bug (ticket #2273) that could cause a segfault when the IN operator is used one one term of a two-column index and the right-hand side of the IN operator contains a NULL.
2. Added a new OS interface method for determining the sector size of underlying media: sqlite3OsSectorSize().
3. A new algorithm for statements of the form INSERT INTO table1 SELECT * FROM table2 is faster and reduces fragmentation. VACUUM uses statements of this form and thus runs faster and defragments better.
4. Performance enhancements through reductions in disk I/O:
   1. Do not read the last page of an overflow chain when deleting the row - just add that page to the freelist.
   2. Do not store pages being deleted in the rollback journal.
   3. Do not read in the (meaningless) content of pages extracted from the freelist.
   4. Do not flush the page cache (and thus avoiding a cache refill) unless another process changes the underlying database file.
   5. Truncate rather than delete the rollback journal when committing a transaction in exclusive access mode, or when committing the TEMP database.
5. Added support for exclusive access mode using "PRAGMA locking_mode=EXCLUSIVE"
6. Use heap space instead of stack space for large buffers in the pager - useful on embedded platforms with stack-space limitations.
7. Add a makefile target "sqlite3.c" that builds an amalgamation containing the core SQLite library C code in a single file.
8. Get the library working correctly when compiled with GCC option "-fstrict-aliasing".
9. Removed the vestigal SQLITE_PROTOCOL error.
10. Improvements to test coverage, other minor bugs fixed, memory leaks plugged, code refactored and/or recommended in places for easier reading.

A complete list of SQLite releases in a single page and a chronology are both also available. A detailed history of every check-in is available at SQLite version control site.

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