mirror of
https://github.com/isar/libmdbx.git
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65919abd9a
Change-Id: I543c1681d1886a54d7c24ea0bca024e82039541e
387 lines
23 KiB
Markdown
387 lines
23 KiB
Markdown
ChangeLog
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---------
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## v0.9.5 (in development)
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TODO:
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- Finalize C++ API (few typos and trivia bugs are still likely for now).
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- [Support for RAW devices](https://github.com/erthink/libmdbx/issues/124).
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- [Fix test framework issue](https://github.com/erthink/libmdbx/issues/127).
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- [Support MessagePack for Keys & Values](https://github.com/erthink/libmdbx/issues/115).
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- [Engage new terminology](https://github.com/erthink/libmdbx/issues/137).
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- Packages for [Astra Linux](https://astralinux.ru/), [ALT Linux](https://www.altlinux.org/), [ROSA Linux](https://www.rosalinux.ru/), Fedora/RHEL, Debian/Ubuntu.
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## v0.9.4 scheduled at 2021-05-09
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TODO:
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- [Documentation issue](https://github.com/erthink/libmdbx/issues/177).
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Acknowledgements:
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- [Mahlon E. Smith](https://github.com/mahlonsmith) for [Ruby bindings](https://rubygems.org/gems/mdbx/).
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- [Alex Sharov](https://github.com/AskAlexSharov) for [mdbx-go](https://github.com/torquem-ch/mdbx-go) , bug reporting and testing.
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- [Artem Vorotnikov](https://github.com/vorot93) for bug reporting and PR.
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- [Paolo Rebuffo](https://www.linkedin.com/in/paolo-rebuffo-8255766/), [Alexey Akhunov](https://github.com/AlexeyAkhunov) and Mark Grosberg for donations.
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- [Noel Kuntze](https://github.com/Thermi) for preliminary [Python bindings](https://github.com/Thermi/libmdbx/tree/python-bindings)
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New features:
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- Added `MDBX_DISABLE_PAGECHECKS` build option to disable some checks to reduce an overhead
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and detection probability of database corruption to a values closer to the LMDB.
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The `MDBX_DISABLE_PAGECHECKS=1` provides a performance boost of about 10% in CRUD scenarios,
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and conjointly with the `MDBX_ENV_CHECKPID=0` and `MDBX_TXN_CHECKOWNER=0` options can yield
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up to 30% more performance compared to LMDB.
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- Using float point (exponential quantized) representation for internal 16-bit values
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of grow step and shrink threshold when huge ones (https://github.com/erthink/libmdbx/issues/166).
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To minimize the impact on compatibility, only the odd values inside the upper half
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of the range (i.e. 32769..65533) are used for the new representation.
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- Added the `mdbx_drop` similar to LMDB command-line tool to purge or delete (sub)database(s).
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- [Ruby bindings](https://rubygems.org/gems/mdbx/) is available now by [Mahlon E. Smith](https://github.com/mahlonsmith).
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- Added `MDBX_ENABLE_MADVISE` build option which controls the use of POSIX `madvise()` hints and friends.
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- The internal node sizes were refined, resulting in a reduction in large/overflow pages in some use cases and a slight increase in limits for a keys size to ≈½ of page size.
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- Added to `mdbx_chk` output number of keys/items on pages.
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- Added explicit `install-strip` and `install-no-strip` targets to the `Makefile` (https://github.com/erthink/libmdbx/pull/180).
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- Major rework page splitting (af9b7b560505684249b76730997f9e00614b8113) for
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- An "auto-appending" feature upon insertion for both ascending and
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descending key sequences. As a result, the optimality of page filling
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increases significantly (more densely, less slackness) while
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inserting ordered sequences of keys,
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- A "splitting at middle" to make page tree more balanced on average.
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- Added `mdbx_get_sysraminfo()` to the API.
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- Added guessing a reasonable maximum DB size for the default upper limit of geometry (https://github.com/erthink/libmdbx/issues/183).
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- Major rework internal labeling of a dirty pages (958fd5b9479f52f2124ab7e83c6b18b04b0e7dda) for
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a "transparent spilling" feature with the gist to make a dirty pages
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be ready to spilling (writing to a disk) without further altering ones.
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Thus in the `MDBX_WRITEMAP` mode the OS kernel able to oust dirty pages
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to DB file without further penalty during transaction commit.
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As a result, page swapping and I/O could be significantly reduced during extra large transactions and/or lack of memory.
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- Minimized reading leaf-pages during dropping subDB(s) and nested trees.
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- Major rework a spilling of dirty pages to support [LRU](https://en.wikipedia.org/wiki/Cache_replacement_policies#Least_recently_used_(LRU)) policy and prioritization for a large/overflow pages.
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- Statistics of page operations (split, merge, copy, spill, etc) now available through `mdbx_env_info_ex()`.
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- Auto-setup limit for length of dirty pages list (`MDBX_opt_txn_dp_limit` option).
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- Support `make options` to list available build options.
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- Support `make help` to list available make targets.
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- Silently `make`'s build by default.
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- Preliminary [Python bindings](https://github.com/Thermi/libmdbx/tree/python-bindings) is available now by [Noel Kuntze](https://github.com/Thermi) (https://github.com/erthink/libmdbx/issues/147).
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Backward compatibility break:
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- The `MDBX_AVOID_CRT` build option was renamed to `MDBX_WITHOUT_MSVC_CRT`.
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This option is only relevant when building for Windows.
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- The `mdbx_env_stat()` always, and `mdbx_env_stat_ex()` when called with the zeroed transaction parameter, now internally start temporary read transaction and thus may returns `MDBX_BAD_RSLOT` error.
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So, just never use deprecated `mdbx_env_stat()' and call `mdbx_env_stat_ex()` with transaction parameter.
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Fixes:
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- Fixed performance regression due non-optimal C11 atomics usage (https://github.com/erthink/libmdbx/issues/160).
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- Fixed "reincarnation" of subDB after it deletion (https://github.com/erthink/libmdbx/issues/168).
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- Fixed (disallowing) implicit subDB deletion via operations on `@MAIN`'s DBI-handle.
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- Fixed a crash of `mdbx_env_info_ex()` in case of a call for a non-open environment (https://github.com/erthink/libmdbx/issues/171).
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- Fixed the selecting/adjustment values inside `mdbx_env_set_geometry()` for implicit out-of-range cases (https://github.com/erthink/libmdbx/issues/170).
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- Fixed `mdbx_env_set_option()` for set initial and limit size of dirty page list ((https://github.com/erthink/libmdbx/issues/179).
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- Fixed an unreasonably huge default upper limit for DB geometry (https://github.com/erthink/libmdbx/issues/183).
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- Fixed `constexpr` specifier for the `slice::invalid()`.
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- Fixed (no)readahead auto-handling (https://github.com/erthink/libmdbx/issues/164).
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- Fixed non-alloy build for Windows.
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- Switched to using Heap-functions instead of LocalAlloc/LocalFree on Windows.
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- Fixed `mdbx_env_stat_ex()` to returning statistics of the whole environment instead of MainDB only (https://github.com/erthink/libmdbx/issues/190).
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## v0.9.3 at 2021-02-02
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Acknowledgements:
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- [Mahlon E. Smith](http://www.martini.nu/) for [FreeBSD port of libmdbx](https://svnweb.freebsd.org/ports/head/databases/mdbx/).
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- [장세연](http://www.castis.com) for bug fixing and PR.
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- [Clément Renault](https://github.com/Kerollmops/heed) for [Heed](https://github.com/Kerollmops/heed) fully typed Rust wrapper.
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- [Alex Sharov](https://github.com/AskAlexSharov) for bug reporting.
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- [Noel Kuntze](https://github.com/Thermi) for bug reporting.
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Removed options and features:
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- Drop `MDBX_HUGE_TRANSACTIONS` build-option (now no longer required).
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New features:
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- Package for FreeBSD is available now by Mahlon E. Smith.
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- New API functions to get/set various options (https://github.com/erthink/libmdbx/issues/128):
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- the maximum number of named databases for the environment;
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- the maximum number of threads/reader slots;
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- threshold (since the last unsteady commit) to force flush the data buffers to disk;
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- relative period (since the last unsteady commit) to force flush the data buffers to disk;
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- limit to grow a list of reclaimed/recycled page's numbers for finding a sequence of contiguous pages for large data items;
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- limit to grow a cache of dirty pages for reuse in the current transaction;
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- limit of a pre-allocated memory items for dirty pages;
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- limit of dirty pages for a write transaction;
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- initial allocation size for dirty pages list of a write transaction;
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- maximal part of the dirty pages may be spilled when necessary;
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- minimal part of the dirty pages should be spilled when necessary;
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- how much of the parent transaction dirty pages will be spilled while start each child transaction;
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- Unlimited/Dynamic size of retired and dirty page lists (https://github.com/erthink/libmdbx/issues/123).
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- Added `-p` option (purge subDB before loading) to `mdbx_load` tool.
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- Reworked spilling of large transaction and committing of nested transactions:
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- page spilling code reworked to avoid the flaws and bugs inherited from LMDB;
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- limit for number of dirty pages now is controllable at runtime;
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- a spilled pages, including overflow/large pages, now can be reused and refunded/compactified in nested transactions;
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- more effective refunding/compactification especially for the loosed page cache.
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- Added `MDBX_ENABLE_REFUND` and `MDBX_PNL_ASCENDING` internal/advanced build options.
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- Added `mdbx_default_pagesize()` function.
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- Better support architectures with a weak/relaxed memory consistency model (ARM, AARCH64, PPC, MIPS, RISC-V, etc) by means [C11 atomics](https://en.cppreference.com/w/c/atomic).
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- Speed up page number lists and dirty page lists (https://github.com/erthink/libmdbx/issues/132).
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- Added `LIBMDBX_NO_EXPORTS_LEGACY_API` build option.
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Fixes:
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- Fixed missing cleanup (null assigned) in the C++ commit/abort (https://github.com/erthink/libmdbx/pull/143).
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- Fixed `mdbx_realloc()` for case of nullptr and `MDBX_WITHOUT_MSVC_CRT=ON` for Windows.
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- Fixed the possibility to use invalid and renewed (closed & re-opened, dropped & re-created) DBI-handles (https://github.com/erthink/libmdbx/issues/146).
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- Fixed 4-byte aligned access to 64-bit integers, including access to the `bootid` meta-page's field (https://github.com/erthink/libmdbx/issues/153).
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- Fixed minor/potential memory leak during page flushing and unspilling.
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- Fixed handling states of cursors's and subDBs's for nested transactions.
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- Fixed page leak in extra rare case the list of retired pages changed during update GC on transaction commit.
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- Fixed assertions to avoid false-positive UB detection by CLANG/LLVM (https://github.com/erthink/libmdbx/issues/153).
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- Fixed `MDBX_TXN_FULL` and regressive `MDBX_KEYEXIST` during large transaction commit with `MDBX_LIFORECLAIM` (https://github.com/erthink/libmdbx/issues/123).
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- Fixed auto-recovery (`weak->steady` with the same boot-id) when Database size at last weak checkpoint is large than at last steady checkpoint.
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- Fixed operation on systems with unusual small/large page size, including PowerPC (https://github.com/erthink/libmdbx/issues/157).
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## v0.9.2 at 2020-11-27
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Acknowledgements:
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- Jens Alfke (Mobile Architect at [Couchbase](https://www.couchbase.com/)) for [NimDBX](https://github.com/snej/nimdbx).
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- Clément Renault (CTO at [MeiliSearch](https://www.meilisearch.com/)) for [mdbx-rs](https://github.com/Kerollmops/mdbx-rs).
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- Alex Sharov (Go-Lang Teach Lead at [TurboGeth/Ethereum](https://ethereum.org/)) for an extreme test cases and bug reporting.
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- George Hazan (CTO at [Miranda NG](https://www.miranda-ng.org/)) for bug reporting.
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- [Positive Technologies](https://www.ptsecurity.com/) for funding and [The Standoff](https://standoff365.com/).
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Added features:
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- Provided package for [buildroot](https://buildroot.org/).
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- Binding for Nim is [available](https://github.com/snej/nimdbx) now by Jens Alfke.
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- Added `mdbx_env_delete()` for deletion an environment files in a proper and multiprocess-safe way.
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- Added `mdbx_txn_commit_ex()` with collecting latency information.
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- Fast completion pure nested transactions.
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- Added `LIBMDBX_INLINE_API` macro and inline versions of some API functions.
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- Added `mdbx_cursor_copy()` function.
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- Extended tests for checking cursor tracking.
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- Added `MDBX_SET_LOWERBOUND` operation for `mdbx_cursor_get()`.
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Fixes:
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- Fixed missing installation of `mdbx.h++`.
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- Fixed use of obsolete `__noreturn`.
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- Fixed use of `yield` instruction on ARM if unsupported.
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- Added pthread workaround for buggy toolchain/cmake/buildroot.
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- Fixed use of `pthread_yield()` for non-GLIBC.
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- Fixed use of `RegGetValueA()` on Windows 2000/XP.
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- Fixed use of `GetTickCount64()` on Windows 2000/XP.
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- Fixed opening DB on a network shares (in the exclusive mode).
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- Fixed copy&paste typos.
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- Fixed minor false-positive GCC warning.
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- Added workaround for broken `DEFINE_ENUM_FLAG_OPERATORS` from Windows SDK.
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- Fixed cursor state after multimap/dupsort repeated deletes (https://github.com/erthink/libmdbx/issues/121).
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- Added `SIGPIPE` suppression for internal thread during `mdbx_env_copy()`.
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- Fixed extra-rare `MDBX_KEY_EXIST` error during `mdbx_commit()` (https://github.com/erthink/libmdbx/issues/131).
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- Fixed spilled pages checking (https://github.com/erthink/libmdbx/issues/126).
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- Fixed `mdbx_load` for 'plain text' and without `-s name` cases (https://github.com/erthink/libmdbx/issues/136).
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- Fixed save/restore/commit of cursors for nested transactions.
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- Fixed cursors state in rare/special cases (move next beyond end-of-data, after deletion and so on).
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- Added workaround for MSVC 19.28 (Visual Studio 16.8) (but may still hang during compilation).
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- Fixed paranoidal Clang C++ UB for bitwise operations with flags defined by enums.
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- Fixed large pages checking (for compatibility and to avoid false-positive errors from `mdbx_chk`).
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- Added workaround for Wine (https://github.com/miranda-ng/miranda-ng/issues/1209).
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- Fixed `ERROR_NOT_SUPPORTED` while opening DB by UNC pathnames (https://github.com/miranda-ng/miranda-ng/issues/2627).
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- Added handling `EXCEPTION_POSSIBLE_DEADLOCK` condition for Windows.
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## v0.9.1 2020-09-30
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Added features:
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- Preliminary C++ API with support for C++17 polymorphic allocators.
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- [Online C++ API reference](https://erthink.github.io/libmdbx/) by Doxygen.
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- Quick reference for Insert/Update/Delete operations.
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- Explicit `MDBX_SYNC_DURABLE` to sync modes for API clarity.
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- Explicit `MDBX_ALLDUPS` and `MDBX_UPSERT` for API clarity.
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- Support for read transactions preparation (`MDBX_TXN_RDONLY_PREPARE` flag).
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- Support for cursor preparation/(pre)allocation and reusing (`mdbx_cursor_create()` and `mdbx_cursor_bind()` functions).
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- Support for checking database using specified meta-page (see `mdbx_chk -h`).
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- Support for turn to the specific meta-page after checking (see `mdbx_chk -h`).
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- Support for explicit reader threads (de)registration.
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- The `mdbx_txn_break()` function to explicitly mark a transaction as broken.
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- Improved handling of corrupted databases by `mdbx_chk` utility and `mdbx_walk_tree()` function.
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- Improved DB corruption detection by checking parent-page-txnid.
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- Improved opening large DB (> 4Gb) from 32-bit code.
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- Provided `pure-function` and `const-function` attributes to C API.
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- Support for user-settable context for transactions & cursors.
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- Revised API and documentation related to Handle-Slow-Readers callback feature.
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Deprecated functions and flags:
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- For clarity and API simplification the `MDBX_MAPASYNC` flag is deprecated.
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Just use `MDBX_SAFE_NOSYNC` or `MDBX_UTTERLY_NOSYNC` instead of it.
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- `MDBX_oom_func`, `mdbx_env_set_oomfunc()` and `mdbx_env_get_oomfunc()`
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replaced with `MDBX_hsr_func`, `mdbx_env_get_hsr` and `mdbx_env_get_hsr()`.
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Fixes:
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- Fix `mdbx_strerror()` for `MDBX_BUSY` error (no error description is returned).
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- Fix update internal meta-geo information in read-only mode (`EACCESS` or `EBADFD` error).
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- Fix `mdbx_page_get()` null-defer when DB corrupted (crash by `SIGSEGV`).
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- Fix `mdbx_env_open()` for re-opening after non-fatal errors (`mdbx_chk` unexpected failures).
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- Workaround for MSVC 19.27 `static_assert()` bug.
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- Doxygen descriptions and refinement.
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- Update Valgrind's suppressions.
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- Workaround to avoid infinite loop of 'nested' testcase on MIPS under QEMU.
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- Fix a lot of typos & spelling (Thanks to Josh Soref for PR).
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- Fix `getopt()` messages for Windows (Thanks to Andrey Sporaw for reporting).
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- Fix MSVC compiler version requirements (Thanks to Andrey Sporaw for reporting).
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- Workarounds for QEMU's bugs to run tests for cross-builded library under QEMU.
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- Now C++ compiler optional for building by CMake.
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## v0.9.0 2020-07-31 (not a release, but API changes)
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Added features:
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- [Online C API reference](https://erthink.github.io/libmdbx/) by Doxygen.
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- Separated enums for environment, sub-databases, transactions, copying and data-update flags.
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Deprecated functions and flags:
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- Usage of custom comparators and the `mdbx_dbi_open_ex()` are deprecated, since such databases couldn't be checked by the `mdbx_chk` utility.
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Please use the value-to-key functions to provide keys that are compatible with the built-in libmdbx comparators.
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## v0.8.2 2020-07-06
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- Added support multi-opening the same DB in a process with SysV locking (BSD).
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- Fixed warnings & minors for LCC compiler (E2K).
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- Enabled to simultaneously open the same database from processes with and without the `MDBX_WRITEMAP` option.
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- Added key-to-value, `mdbx_get_keycmp()` and `mdbx_get_datacmp()` functions (helpful to avoid using custom comparators).
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- Added `ENABLE_UBSAN` CMake option to enabling the UndefinedBehaviorSanitizer from GCC/CLANG.
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- Workaround for [CLANG bug](https://bugs.llvm.org/show_bug.cgi?id=43275).
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- Returning `MDBX_CORRUPTED` in case all meta-pages are weak and no other error.
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- Refined mode bits while auto-creating LCK-file.
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- Avoids unnecessary database file re-mapping in case geometry changed by another process(es).
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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.
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- Remapping on-the-fly and of the database file was implemented.
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Now remapping with a change of address is performed automatically if there are no dependent readers in the current process.
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## v0.8.1 2020-06-12
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- Minor change versioning. The last number in the version now means the number of commits since last release/tag.
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- Provide ChangeLog file.
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- Fix for using libmdbx as a C-only sub-project with CMake.
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- Fix `mdbx_env_set_geometry()` for case it is called from an opened environment outside of a write transaction.
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- Add support for huge transactions and `MDBX_HUGE_TRANSACTIONS` build-option (default `OFF`).
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- Refine LTO (link time optimization) for clang.
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- Force enabling exceptions handling for MSVC (`/EHsc` option).
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## v0.8.0 2020-06-05
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- Support for Android/Bionic.
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- Support for iOS.
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- Auto-handling `MDBX_NOSUBDIR` while opening for any existing database.
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- Engage github-actions to make release-assets.
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- Clarify API description.
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- Extended keygen-cases in stochastic test.
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- Fix fetching of first/lower key from LEAF2-page during page merge.
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- Fix missing comma in array of error messages.
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- Fix div-by-zero while copy-with-compaction for non-resizable environments.
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- Fixes & enhancements for custom-comparators.
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- Fix `MDBX_WITHOUT_MSVC_CRT` option and missing `ntdll.def`.
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- Fix `mdbx_env_close()` to work correctly called concurrently from several threads.
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- Fix null-deref in an ASAN-enabled builds while opening the environment with error and/or read-only.
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- Fix AddressSanitizer errors after closing the environment.
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- Fix/workaround to avoid GCC 10.x pedantic warnings.
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- Fix using `ENODATA` for FreeBSD.
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- Avoid invalidation of DBI-handle(s) when it just closes.
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- Avoid using `pwritev()` for single-writes (up to 10% speedup for some kernels & scenarios).
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- Avoiding `MDBX_UTTERLY_NOSYNC` as result of flags merge.
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- Add `mdbx_dbi_dupsort_depthmask()` function.
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- Add `MDBX_CP_FORCE_RESIZEABLE` option.
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- Add deprecated `MDBX_MAP_RESIZED` for compatibility.
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- Add `MDBX_BUILD_TOOLS` option (default `ON`).
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- Refine `mdbx_dbi_open_ex()` to safe concurrently opening the same handle from different threads.
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- Truncate clk-file during environment closing. So a zero-length lck-file indicates that the environment was closed properly.
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- 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.
|