Release v0.9.3 (obsolete)

Acknowledgements:

• Mahlon E. Smith for FreeBSD port of libmdbx.
• 장세연 for bug fixing and PR.
• Clément Renault for Heed fully typed Rust wrapper.
• Alex Sharov for bug reporting.
• Noel Kuntze for bug reporting.

Removed options and features:

• Drop MDBX_HUGE_TRANSACTIONS build-option (now no longer required).

New features:

• Package for FreeBSD is available now by Mahlon E. Smith.
• New API functions to get/set various options (#128):
  • the maximum number of named databases for the environment;
  • the maximum number of threads/reader slots;
  • threshold (since the last unsteady commit) to force flush the data buffers to disk;
  • relative period (since the last unsteady commit) to force flush the data buffers to disk;
  • limit to grow a list of reclaimed/recycled page's numbers for finding a sequence of contiguous pages for large data items;
  • limit to grow a cache of dirty pages for reuse in the current transaction;
  • limit of a pre-allocated memory items for dirty pages;
  • limit of dirty pages for a write transaction;
  • initial allocation size for dirty pages list of a write transaction;
  • maximal part of the dirty pages may be spilled when necessary;
  • minimal part of the dirty pages should be spilled when necessary;
  • how much of the parent transaction dirty pages will be spilled while start each child transaction;
• Unlimited/Dynamic size of retired and dirty page lists (#123).
• Added -p option (purge subDB before loading) to mdbx_load tool.
• Reworked spilling of large transaction and committing of nested transactions:
  • page spilling code reworked to avoid the flaws and bugs inherited from LMDB;
  • limit for number of dirty pages now is controllable at runtime;
  • a spilled pages, including overflow/large pages, now can be reused and refunded/compactified in nested transactions;
  • more effective refunding/compactification especially for the loosed page cache.
• Added MDBX_ENABLE_REFUND and MDBX_PNL_ASCENDING internal/advanced build options.
• Added mdbx_default_pagesize() function.
• Better support architectures with a weak/relaxed memory consistency model (ARM, AARCH64, PPC, MIPS, RISC-V, etc) by means C11 atomics.
• Speed up page number lists and dirty page lists (#132).
• Added LIBMDBX_NO_EXPORTS_LEGACY_API build option.

Fixes:

• Fixed missing cleanup (null assigned) in the C++ commit/abort (#143).
• Fixed mdbx_realloc() for case of nullptr and MDBX_AVOID_CRT=ON for Windows.
• Fixed the possibility to use invalid and renewed (closed & re-opened, dropped & re-created) DBI-handles (#146).
• Fixed 4-byte aligned access to 64-bit integers, including access to the bootid meta-page's field (#153).
• Fixed minor/potential memory leak during page flushing and unspilling.
• Fixed handling states of cursors's and subDBs's for nested transactions.
• Fixed page leak in extra rare case the list of retired pages changed during update GC on transaction commit.
• Fixed assertions to avoid false-positive UB detection by CLANG/LLVM (#153).
• Fixed MDBX_TXN_FULL and regressive MDBX_KEYEXIST during large transaction commit with MDBX_LIFORECLAIM (#123).
• Fixed auto-recovery (weak->steady with the same boot-id) when Database size at last weak checkpoint is large than at last steady checkpoint.
• Fixed operation on systems with unusual small/large page size, including PowerPC (#157).

TODO:

• Engage new terminology (#137).
• Resolve few TODOs (#124, #127, #115).
• Finalize C++ API.
• Packages for ROSA Linux, ALT Linux, Fedora/RHEL, Debian/Ubuntu.

SHA256 checksums

d12bc7189b746beaa85514fcd1fcf26b957bb8feadb11662a0e20c4e79410d3f  libmdbx-amalgamated-0.9.3.tar.gz
f8249209d31f61750c470f042ecb24e5465424a801221473a0eca49b6af69f66  libmdbx-amalgamated-0_9_3.zip
2bae1558c37bd787df40d16c021bd074111aabde5a333b23ea46ba0c2f7fd2ce  v0.9.3.tar.gz
876b820bd7519b7f8942e9fe5ddc88edd5c2bb002e383667aac953de408dfa2b  v0.9.3.zip