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## SQLite Release 3.8.7 On 2014-10-17

Performance Enhancements:

1. Many micro-optimizations result in 20.3% more work for the same number of CPU cycles relative to the previous release. The cumulative performance increase since version 3.8.0 is 61%. (Measured using cachegrind on the speedtest1.c workload on Ubuntu 13.10 x64 with gcc 4.8.1 and -Os. Your performance may vary.)
2. The sorter can use auxiliary helper threads to increase real-time response. This feature is off by default and may be enabled using the PRAGMA threads command or the SQLITE_DEFAULT_WORKER_THREADS compile-time option.
3. Enhance the skip-scan optimization so that it is able to skip index terms that occur in the middle of the index, not just as the left-hand side of the index.
4. Improved optimization of CAST operators.
5. Various improvements in how the query planner uses sqlite_stat4 information to estimate plan costs.

   New Features:

6. Added new interfaces with 64-bit length parameters: sqlite3_malloc64(), sqlite3_realloc64(), sqlite3_bind_blob64(), sqlite3_result_blob64(), sqlite3_bind_text64(), and sqlite3_result_text64().
7. Added the new interface sqlite3_msize() that returns the size of a memory allocation obtained from sqlite3_malloc64() and its variants.
8. Added the SQLITE_LIMIT_WORKER_THREADS option to sqlite3_limit() and PRAGMA threads command for configuring the number of available worker threads.
9. The spellfix1 extension allows the application to optionally specify the rowid for each INSERT.
10. Added the User Authentication extension.

    Bug Fixes:

11. Fix a bug in the partial index implementation that might result in an incorrect answer if a partial index is used in a subquery or in a view. Ticket 98d973b8f5.
12. Fix a query planner bug that might cause a table to be scanned in the wrong direction (thus reversing the order of output) when a DESC index is used to implement the ORDER BY clause on a query that has an identical GROUP BY clause. Ticket ba7cbfaedc7e6.
13. Fix a bug in sqlite3_trace() that was causing it to sometimes fail to print an SQL statement if that statement needed to be re-prepared. Ticket 11d5aa455e0d98f3c1e6a08
14. Fix a faulty assert() statement. Ticket 369d57fb8e5ccdff06f1

    Test, Debug, and Analysis Changes:

15. Show ASCII-art abstract syntax tree diagrams using the ".selecttrace" and ".wheretrace" commands in the command-line shell when compiled with SQLITE_DEBUG, SQLITE_ENABLE_SELECTTRACE, and SQLITE_ENABLE_WHERETRACE. Also provide the sqlite3TreeViewExpr() and sqlite3TreeViewSelect() entry points that can be invoked from with the debugger to show the parse tree when stopped at a breakpoint.
16. Drop support for SQLITE_ENABLE_TREE_EXPLAIN. The SELECTTRACE mechanism provides more useful diagnostics information.
17. New options to the command-line shell for configuring auxiliary memory usage: --pagecache, --lookaside, and --scratch.
18. SQLITE_SOURCE_ID: "2014-10-17 11:24:17 e4ab094f8afce0817f4074e823fabe59fc29ebb4"
19. SHA1 for sqlite3.c: 56dcf5e931a9e1fa12fc2d600cd91d3bf9b639cd

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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