libmdbx/ChangeLog.md

v0.9.x (in the development):

• TODO: API for explicit threads (de)registration.   - TODO: Native bindings for C++.   - TODO: Packages for AltLinux, Fedora/RHEL, Debian/Ubuntu.

v0.8.2 2020-07-06:   - Added support multi-opening the same DB in a process with SysV locking (BSD).   - Fixed warnings & minors for LCC compiler (E2K).   - Enabled to simultaneously open the same database from processes with and without the MDBX_WRITEMAP option.   - Added key-to-value, mdbx_get_keycmp() and mdbx_get_datacmp() functions (helpful to avoid using custom comparators).

• Added ENABLE_UBSAN CMake option to enabling the UndefinedBehaviorSanitizer from GCC/CLANG.   - Workaround for CLANG bug https://bugs.llvm.org/show_bug.cgi?id=43275.   - Returning MDBX_CORRUPTED in case all meta-pages are weak and no other error.   - Refined mode bits while auto-creating LCK-file.
• Avoids unnecessary database file re-mapping in case geometry changed by another process(es). From the user's point of view, the MDBX_UNABLE_EXTEND_MAPSIZE error will now be returned less frequently and only when using the DB in the current process really requires it to be reopened.
• Remapping on-the-fly and of the database file was implemented. Now remapping with a change of address is performed automatically if there are no dependent readers in the current process.

v0.8.1 2020-06-12:   - Minor change versioning. The last number in the version now means the number of commits since last release/tag.   - Provide ChangeLog file.   - Fix for using libmdbx as a C-only sub-project with CMake.   - Fix mdbx_env_set_geometry() for case it is called from an opened environment outside of a write transaction.   - Add support for huge transactions and MDBX_HUGE_TRANSACTIONS build-option (default OFF).   - Refine LTO (link time optimization) for clang.   - Force enabling exceptions handling for MSVC (/EHsc option).

v0.8.0 2020-06-05:   - Support for Android/Bionic.   - Support for iOS.   - Auto-handling MDBX_NOSUBDIR while opening for any existing database.   - Engage github-actions to make release-assets.   - Clarify API description.   - Extended keygen-cases in stochastic test.   - Fix fetching of first/lower key from LEAF2-page during page merge.   - Fix missing comma in array of error messages.   - Fix div-by-zero while copy-with-compaction for non-resizable environments.   - Fixes & enhancements for custom-comparators.   - Fix MDBX_AVOID_CRT option and missing ntdll.def.   - Fix mdbx_env_close() to work correctly called concurrently from several threads.   - Fix null-deref in an ASAN-enabled builds while opening the environment with error and/or read-only.   - Fix AddressSanitizer errors after closing the environment.   - Fix/workaround to avoid GCC 10.x pedantic warnings.   - Fix using ENODATA for FreeBSD.   - Avoid invalidation of DBI-handle(s) when it just closes.   - Avoid using pwritev() for single-writes (up to 10% speedup for some kernels & scenarios).   - Avoiding MDBX_UTTERLY_NOSYNC as result of flags merge.   - Add mdbx_dbi_dupsort_depthmask() function.   - Add MDBX_CP_FORCE_RESIZEABLE option.   - Add deprecated MDBX_MAP_RESIZED for compatibility.   - Add MDBX_BUILD_TOOLS option (default ON).   - Refine mdbx_dbi_open_ex() to safe concurrently opening the same handle from different threads.   - Truncate clk-file during environment closing. So a zero-length lck-file indicates that the environment was closed properly.   - Refine mdbx_update_gc() for huge transactions with small sizes of database page.   - Extends dump/load to support all MDBX attributes.   - Avoid upsertion the same key-value data, fix related assertions.   - Rework min/max length checking for keys & values.   - Checking the order of keys on all pages during checking.   - Support CFLAGS_EXTRA make-option for convenience.   - Preserve the last txnid while copying with compactification.   - Auto-reset running transaction in mdbx_txn_renew().   - Automatically abort errored transaction in mdbx_txn_commit().   - Auto-choose page size for large databases.   - Rearrange source files, rework build, options-support by CMake.   - Crutch for WSL1 (Windows subsystem for Linux).   - Refine install/uninstall targets.   - Support for Valgrind 3.14 and later.   - Add check-analyzer check-ubsan check-asan check-leak targets to Makefile.   - Minor fix/workaround to avoid UBSAN traps for memcpy(ptr, NULL, 0).   - Avoid some GCC-analyzer false-positive warnings.

v0.7.0 2020-03-18:   - Workarounds for Wine (Windows compatibility layer for Linux).   - MDBX_MAP_RESIZED renamed to MDBX_UNABLE_EXTEND_MAPSIZE.   - Clarify API description, fix typos.   - Speedup runtime checks in debug/checked builds.   - Added checking for read/write transactions overlapping for the same thread, added MDBX_TXN_OVERLAPPING error and MDBX_DBG_LEGACY_OVERLAP option.   - Added mdbx_key_from_jsonInteger(), mdbx_key_from_double(), mdbx_key_from_float(), mdbx_key_from_int64() and mdbx_key_from_int32() functions. See mdbx.h for description.   - Fix compatibility (use zero for invalid DBI).   - Refine/clarify error messages.   - Avoids extra error messages "bad txn" from mdbx_chk when DB is corrupted.

v0.6.0 2020-01-21:   - Fix mdbx_load utility for custom comparators.   - Fix checks related to MDBX_APPEND flag inside mdbx_cursor_put().   - Refine/fix dbi_bind() internals.   - Refine/fix handling STATUS_CONFLICTING_ADDRESSES.   - Rework MDBX_DBG_DUMP option to avoid disk I/O performance degradation.   - Add built-in help to test tool.   - Fix mdbx_env_set_geometry() for large page size.   - Fix env_set_geometry() for large pagesize.   - Clarify API description & comments, fix typos.

v0.5.0 2019-12-31:   - Fix returning MDBX_RESULT_TRUE from page_alloc().   - Fix false-positive ASAN issue.   - Fix assertion for MDBX_NOTLS option.   - Rework MADV_DONTNEED threshold.   - Fix mdbx_chk utility for don't checking some numbers if walking on the B-tree was disabled.   - Use page's mp_txnid for basic integrity checking.   - Add MDBX_FORCE_ASSERTIONS built-time option.   - Rework MDBX_DBG_DUMP to avoid performance degradation.   - Rename MDBX_NOSYNC to MDBX_SAFE_NOSYNC for clarity.   - Interpret ERROR_ACCESS_DENIED from OpenProcess() as 'process exists'.   - Avoid using FILE_FLAG_NO_BUFFERING for compatibility with small database pages.   - Added install section for CMake.

v0.4.0 2019-12-02:   - Support for Mac OSX, FreeBSD, NetBSD, OpenBSD, DragonFly BSD, OpenSolaris, OpenIndiana (AIX and HP-UX pending).   - Use bootid for decisions of rollback.   - Counting retired pages and extended transaction info.   - Add MDBX_ACCEDE flag for database opening.   - Using OFD-locks and tracking for in-process multi-opening.   - Hot backup into pipe.   - Support for cmake & amalgamated sources.   - Fastest internal sort implementation.   - New internal dirty-list implementation with lazy sorting.   - Support for lazy-sync-to-disk with polling.   - Extended key length.   - Last update transaction number for each sub-database.   - Automatic read ahead enabling/disabling.   - More auto-compactification.   - Using -fsanitize=undefined and -Wpedantic options.   - Rework page merging.   - Nested transactions.   - API description.   - Checking for non-local filesystems to avoid DB corruption.