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d01e44db0c
The stable release with the hotfix/workaround for a flaw of Linux 4.19 (at least) unified page/buffer cache. See [issue#269](https://github.com/erthink/libmdbx/issues/269) for more information. Acknowledgements: ----------------- - [Simon Leier](https://github.com/leisim) for reporting and testing. - [Kai Wetlesen](https://github.com/kaiwetlesen) for [RPMs](http://copr.fedorainfracloud.org/coprs/kwetlesen/libmdbx/). - [Tullio Canepa](https://github.com/canepat) for reporting C++ API issue and contributing. Fixes: ------ - [Added workaround](https://github.com/erthink/libmdbx/issues/269) for a flaw of Linux 4.19 (at least) unified page/buffer cache. - [Fixed/Reworked](https://github.com/erthink/libmdbx/pull/270) move-assignment operators for "managed" classes of C++ API. - Fixed potential `SIGSEGV` while open DB with overrided non-default page size. - [Made](https://github.com/erthink/libmdbx/issues/267) `mdbx_env_open()` idempotence in failure cases. - Refined/Fixed pages reservation inside `mdbx_update_gc()` to avoid non-reclamation in a rare cases. - Fixed typo in a retained space calculation for the hsr-callback. Minors: ------- - Reworked functions for meta-pages, split-off non-volatile. - Disentangled C11-atomic fences/barriers and pure-functions (with `__attribute__((__pure__))`) to avoid compiler misoptimization. - Fixed hypotetic unaligned access to 64-bit dwords on ARM with `__ARM_FEATURE_UNALIGNED` defined. - Reasonable paranoia that makes clarity for code readers. - Minor fixes Doxygen references, comments, descriptions, etc. Signed-off-by: Леонид Юрьев (Leonid Yuriev) <leo@yuriev.ru>
100 lines
2.8 KiB
Groff
100 lines
2.8 KiB
Groff
.\" Copyright 2015-2022 Leonid Yuriev <leo@yuriev.ru>.
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.\" Copying restrictions apply. See COPYRIGHT/LICENSE.
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.TH MDBX_CHK 1 "2022-02-23" "MDBX 0.11.5"
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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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.BR \-c ]
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[\c
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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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[\c
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.BI \-s \ subdb\fR]
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.BR \ dbpath
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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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.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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.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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.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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.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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.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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.BR mdbx_drop (1)
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.SH AUTHOR
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Leonid Yuriev <https://github.com/erthink>
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