2022-01-15 18:50:22 +03:00
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.\" Copyright 2015-2022 Leonid Yuriev <leo@yuriev.ru>.
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2019-09-10 16:08:21 +03:00
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.\" Copying restrictions apply. See COPYRIGHT/LICENSE.
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mdbx: release v0.12.1 (Positive Proxima)
The planned frontward release with new superior features on the day of 20 anniversary of [Positive Technologies](https://ptsecurty.com).
New:
----
- The `Big Foot` feature which significantly reduces GC overhead for processing large lists of retired pages from huge transactions.
Now _libmdbx_ avoid creating large chunks of PNLs (page number lists) which required a long sequences of free pages, aka large/overflow pages.
Thus avoiding searching, allocating and storing such sequences inside GC.
- Improved hot/online validation and checking of database pages both for more robustness and performance.
- New solid and fast method to latch meta-pages called `Troika`.
The minimum of memory barriers, reads, comparisons and conditional transitions are used.
- New `MDBX_VALIDATION` environment options to extra validation of DB structure and pages content for carefully/safe handling damaged or untrusted DB.
- Accelerated ×16/×8/×4 by AVX512/AVX2/SSE2/Neon implementations of search page sequences.
- Added the `gcrtime_seconds16dot16` counter to the "Page Operation Statistics" that accumulates time spent for GC searching and reclaiming.
- Copy-with-compactification now clears/zeroes unused gaps inside database pages.
- The `C` and `C++` APIs has been extended and/or refined to simplify using `wchar_t` pathnames.
On Windows the `mdbx_env_openW()`, `mdbx_env_get_pathW()`, `mdbx_env_copyW()`, `mdbx_env_open_for_recoveryW()` are available for now,
but the `mdbx_env_get_path()` has been replaced in favor of `mdbx_env_get_pathW()`.
- Added explicit error message for Buildroot's Microblaze toolchain maintainers.
- Added `MDBX_MANAGE_BUILD_FLAGS` build options for CMake.
- Speed-up internal `bsearch`/`lower_bound` implementation using branchless tactic, including workaround for CLANG x86 optimiser bug.
- A lot internal refinement and micro-optimisations.
- Internally counted volume of dirty pages (unused for now but for coming features).
Fixes:
------
- Never use modern `__cxa_thread_atexit()` on Apple's OSes.
- Don't check owner for finished transactions.
- Fixed typo in `MDBX_EINVAL` which breaks MingGW builds with CLANG.
37 files changed, 7604 insertions(+), 7417 deletions(-)
Signed-off-by: Леонид Юрьев (Leonid Yuriev) <leo@yuriev.ru>
2022-08-24 16:24:22 +03:00
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.TH MDBX_CHK 1 "2022-08-24" "MDBX 0.12.1"
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2019-09-10 16:08:21 +03:00
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.SH NAME
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mdbx_chk \- MDBX checking tool
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.SH SYNOPSIS
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.B mdbx_chk
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[\c
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.BR \-V ]
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[\c
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.BR \-v [ v [ v ]]]
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[\c
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.BR \-n ]
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[\c
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.BR \-q ]
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[\c
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2019-12-05 01:43:57 +03:00
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.BR \-c ]
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[\c
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2019-09-10 16:08:21 +03:00
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.BR \-w ]
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[\c
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.BR \-d ]
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[\c
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.BR \-i ]
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2019-12-05 01:43:57 +03:00
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[\c
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.BI \-s \ subdb\fR]
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.BR \ dbpath
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2019-09-10 16:08:21 +03:00
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.SH DESCRIPTION
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The
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.B mdbx_chk
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utility intended to check an MDBX database file.
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.SH OPTIONS
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.TP
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.BR \-V
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Write the library version number to the standard output, and exit.
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.TP
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.BR \-v
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Produce verbose output, including summarize space and page usage statistics.
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If \fB\-vv\fP is given, be more verbose, show summarized B-tree info
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and space allocation.
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If \fB\-vvv\fP is given, be more verbose, include summarized statistics
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of leaf B-tree pages.
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If \fB\-vvvv\fP is given, be even more verbose, show info of each page
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during B-tree traversal and basic info of each GC record.
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If \fB\-vvvvv\fP is given, turn maximal verbosity, display the full list
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of page IDs in the GC records and size of each key-value pair of database(s).
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.TP
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.BR \-q
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Be quiet; do not output anything even if an error was detected.
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.TP
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2019-12-05 01:43:57 +03:00
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.BR \-c
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Force using cooperative mode while opening environment, i.e. don't try to open
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in exclusive/monopolistic mode. Only exclusive/monopolistic mode allow complete
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check, including full check of all meta-pages and actual size of database file.
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.TP
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2019-09-10 16:08:21 +03:00
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.BR \-w
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Open environment in read-write mode and lock for writing while checking.
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This could be impossible if environment already used by another process(s)
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in an incompatible read-write mode. This allow rollback to last steady commit
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(in case environment was not closed properly) and then check transaction IDs
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of meta-pages. Otherwise, without \fB\-w\fP option environment will be
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opened in read-only mode.
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.TP
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.BR \-d
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Disable page-by-page traversal of B-tree. In this case, without B-tree
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traversal, it is unable to check for lost-unused pages nor for double-used
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pages.
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.TP
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.BR \-i
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Ignore wrong order errors, which will likely false-positive if custom
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comparator(s) was used.
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2019-12-05 01:43:57 +03:00
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.TP
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.BR \-s \ subdb
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Verify and show info only for a specific subdatabase.
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2020-09-25 02:10:55 +03:00
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.TP
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.BR \-0 | \-1 | \-2
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Using specific meta-page 0, or 2 for checking.
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.TP
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.BR \-t
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Turn to a specified meta-page on successful check.
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.TP
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.BR \-T
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Turn to a specified meta-page EVEN ON UNSUCCESSFUL CHECK!
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.TP
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.BR \-n
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Open MDBX environment(s) which do not use subdirectories.
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This is legacy option. For now MDBX handles this automatically.
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2020-09-28 15:37:47 +03:00
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2019-09-10 16:08:21 +03:00
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.SH DIAGNOSTICS
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Exit status is zero if no errors occur. Errors result in a non-zero exit status
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and a diagnostic message being written to standard error
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if no quiet mode was requested.
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.SH "SEE ALSO"
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.BR mdbx_stat (1),
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.BR mdbx_copy (1),
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.BR mdbx_dump (1),
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.BR mdbx_load (1)
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2021-03-10 14:43:49 +03:00
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.BR mdbx_drop (1)
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2019-09-10 16:08:21 +03:00
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.SH AUTHOR
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2022-04-20 06:42:16 +03:00
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Leonid Yuriev <https://gitflic.ru/user/erthink>
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