Changes 3.8.8:

New Features:
* Added the PRAGMA data_version command that can be used to determine if a database file has been modified by another process.
* Added the SQLITE_CHECKPOINT_TRUNCATE option to the sqlite3_wal_checkpoint_v2() interface, with corresponding enhancements to PRAGMA wal_checkpoint.
* Added the sqlite3_stmt_scanstatus() interface, available only when compiled with SQLITE_ENABLE_STMT_SCANSTATUS.
* The sqlite3_table_column_metadata() is enhanced to work correctly on WITHOUT ROWID tables and to check for the existence of a a table if the column name parameter is NULL. The interface is now also included in the build by default, without requiring the SQLITE_ENABLE_COLUMN_METADATA compile-time option.
* Added the SQLITE_ENABLE_API_ARMOR compile-time option.
* Added the SQLITE_REVERSE_UNORDERED_SELECTS compile-time option.
* Added the SQLITE_SORTER_PMASZ compile-time option and SQLITE_CONFIG_PMASZ start-time option.
* Added the SQLITE_CONFIG_PCACHE_HDRSZ option to sqlite3_config() which makes it easier for applications to determine the appropriate amount of memory for use with SQLITE_CONFIG_PAGECACHE.
* The number of rows in a VALUES clause is no longer limited by SQLITE_LIMIT_COMPOUND_SELECT.
* Added the eval.c loadable extension that implements an eval() SQL function that will recursively evaluate SQL.

Performance Enhancements:
* Reduce the number of memcpy() operations involved in balancing a b-tree, for 3.2% overall performance boost.
* Improvements to cost estimates for the skip-scan optimization.
* The automatic indexing optimization is now capable of generating a partial index if that is appropriate.

Bug fixes:
* Ensure durability following a power loss with "PRAGMA journal_mode=TRUNCATE" by calling fsync() right after truncating the journal file.
* The query planner now recognizes that any column in the right-hand table of a LEFT JOIN can be NULL, even if that column has a NOT NULL constraint. Avoid trying to optimize out NULL tests in those cases.
* Make sure ORDER BY puts rows in ascending order even if the DISTINCT operator is implemented using a descending index.
* Fix data races that might occur under stress when running with many threads in shared cache mode where some of the threads are opening and closing connections.
* Fix obscure crash bugs found by american fuzzy lop.
* Work around a GCC optimizer bug (for gcc 4.2.1 on MacOS 10.7) that caused the R-Tree extension to compute incorrect results when compiled with -O3.

Other changes:
* Disable the use of the strchrnul() C-library routine unless it is specifically enabled using the -DHAVE_STRCHRNULL compile-time option.
* Improvements to the effectiveness and accuracy of the likelihood(), likely(), and unlikely() SQL hint functions.

0 files changed, 0 insertions, 0 deletions