2021-01-26 07:26:09 +03:00
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.\" Copyright 2015-2021 Leonid Yuriev <leo@yuriev.ru>.
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2017-05-24 01:07:15 +03:00
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.\" Copyright 2012-2015 Howard Chu, Symas Corp. All Rights Reserved.
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2017-01-01 14:56:00 +03:00
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.\" Copyright 2015,2016 Peter-Service R&D LLC <http://billing.ru/>.
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2015-01-07 16:49:50 +03:00
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.\" Copying restrictions apply. See COPYRIGHT/LICENSE.
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mdbx: release v0.9.3
Acknowledgements:
-----------------
- [Mahlon E. Smith](http://www.martini.nu/) for [FreeBSD port of libmdbx](https://svnweb.freebsd.org/ports/head/databases/mdbx/).
- [장세연](http://www.castis.com) for bug fixing and PR.
- [Clément Renault](https://github.com/Kerollmops/heed) for [Heed](https://github.com/Kerollmops/heed) fully typed Rust wrapper.
- [Alex Sharov](https://github.com/AskAlexSharov) for bug reporting.
- [Noel Kuntze](https://github.com/Thermi) 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 (https://github.com/erthink/libmdbx/issues/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 (https://github.com/erthink/libmdbx/issues/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](https://en.cppreference.com/w/c/atomic).
- Speed up page number lists and dirty page lists (https://github.com/erthink/libmdbx/issues/132).
- Added `LIBMDBX_NO_EXPORTS_LEGACY_API` build option.
Fixes:
------
- Fixed missing cleanup (null assigned) in the C++ commit/abort (https://github.com/erthink/libmdbx/pull/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 (https://github.com/erthink/libmdbx/issues/146).
- 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).
- 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 (https://github.com/erthink/libmdbx/issues/153).
- Fixed `MDBX_TXN_FULL` and regressive `MDBX_KEYEXIST` during large transaction commit with `MDBX_LIFORECLAIM` (https://github.com/erthink/libmdbx/issues/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 (https://github.com/erthink/libmdbx/issues/157).
TODO:
-----
- Engage new terminology (https://github.com/erthink/libmdbx/issues/137).
- Resolve few TODOs (https://github.com/erthink/libmdbx/issues/124, https://github.com/erthink/libmdbx/issues/127, https://github.com/erthink/libmdbx/issues/115).
- Finalize C++ API.
- Packages for [ROSA Linux](https://www.rosalinux.ru/), [ALT Linux](https://www.altlinux.org/), Fedora/RHEL, Debian/Ubuntu.
Change-Id: I414b8ef2e4b90e04fb344779c0e3f1b4bd1c06be
2021-02-02 22:18:21 +03:00
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.TH MDBX_STAT 1 "2021-02-02" "MDBX 0.9.3"
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2015-01-07 16:49:50 +03:00
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.SH NAME
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2017-05-24 01:42:10 +03:00
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mdbx_stat \- MDBX environment status tool
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.SH SYNOPSIS
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2017-02-21 20:16:54 +03:00
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.B mdbx_stat
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[\c
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.BR \-V ]
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[\c
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.BR \-q ]
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[\c
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.BR \-e ]
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[\c
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.BR \-f [ f [ f ]]]
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[\c
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.BR \-r [ r ]]
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[\c
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.BR \-a \ |
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.BI \-s \ subdb\fR]
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.BR \ dbpath
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[\c
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.BR \-n ]
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.SH DESCRIPTION
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The
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.B mdbx_stat
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utility displays the status of an MDBX environment.
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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 \-q
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Be quiet.
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.TP
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.BR \-e
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Display information about the database environment.
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.TP
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.BR \-f
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Display information about the environment freelist.
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If \fB\-ff\fP is given, summarize each freelist entry.
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If \fB\-fff\fP is given, display the full list of page IDs in the freelist.
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.TP
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.BR \-r
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Display information about the environment reader table.
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Shows the process ID, thread ID, and transaction ID for each active
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reader slot. The process ID and transaction ID are in decimal, the
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thread ID is in hexadecimal. The transaction ID is displayed as "-"
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if the reader does not currently have a read transaction open.
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If \fB\-rr\fP is given, check for stale entries in the reader
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table and clear them. The reader table will be printed again
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after the check is performed.
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.TP
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.BR \-a
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Display the status of all of the subdatabases in the environment.
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.TP
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.BR \-s \ subdb
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Display the status of a specific subdatabase.
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.TP
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.BR \-n
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Display the status of an MDBX database which does not use subdirectories.
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This is legacy option. For now MDBX handles this automatically
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for existing databases, but may be required while creating new.
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2015-01-07 16:49:50 +03:00
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.SH DIAGNOSTICS
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Exit status is zero if no errors occur.
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Errors result in a non-zero exit status and
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a diagnostic message being written to standard error.
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.SH "SEE ALSO"
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2019-09-10 16:08:21 +03:00
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.BR mdbx_chk (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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2015-01-07 16:49:50 +03:00
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.SH AUTHOR
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2019-12-05 01:43:57 +03:00
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Howard Chu of Symas Corporation <http://www.symas.com>,
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2020-02-18 02:22:47 +03:00
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Leonid Yuriev <https://github.com/erthink>
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