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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE chapter SYSTEM "chapter.dtd">
<chapter>
<header>
<copyright>
<year>2004</year><year>2013</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
</legalnotice>
<title>Mnesia Release Notes</title>
<prepared>Dan Gudmundsson and Håkan Mattsson</prepared>
<responsible></responsible>
<docno></docno>
<approved></approved>
<checked></checked>
<date>04-08-22</date>
<rev>AE</rev>
<file>notes_history.sgml</file>
</header>
<p>This document describes the changes made to the Mnesia system
from version to version. The intention of this document is to
list all incompatibilities as well as all enhancements and
bugfixes for every release of Mnesia. Each release of Mnesia
thus constitutes one section in this document. The title of each
section is the version number of Mnesia.</p>
<section><title>Mnesia 4.3.7</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
Removed a memory leak on ram-only nodes, introduced in
<c>mnesia-4.3.6</c>.</p>
<p>
Own Id: OTP-6936 Aux Id: seq10786 </p>
</item>
</list>
</section>
<section>
<title>Known Bugs and Problems</title>
<list type="bulleted">
<item>
<p>Rearranging fragmented tables is an O(N^2)
operation.</p>
<p>Own Id: OTP-6300</p>
</item>
</list>
</section>
</section>
<section>
<title>Mnesia 4.3.6</title>
<section><title>Fixed Bugs and Malfunctions</title>
<list>
<item>
<p>
A bug causing lots of records to be lost at startup from
an installed fallback has been fixed. The bug did however
not show up when a backup file generated with
<c>mnesia:backup/1</c> or
<c>mnesia:backup_checkpoint/2</c> was installed as
fallback. In order to trigger the bug, the items in the
backup file had to be rearranged in such an order that
records from different tables were interleaved with each
other.</p>
<p>
Own Id: OTP-6903 Aux Id: seq10763 </p>
</item>
<item>
<p>
Mnesia sometimes failed to commit schema operations on
all nodes, this have been seen on smp machines but could
happen on single processor as well with some bad timing.</p>
<p>
Own Id: OTP-6904</p>
</item>
<item>
<p>
<c>mnesia:select/1</c> failed to return all matches on
remote nodes if something was written to the table
earlier in the same transaction.</p>
<p>
Own Id: OTP-6908</p>
</item>
</list>
</section>
<section>
<title>Known Bugs and Problems</title>
<list type="bulleted">
<item>
<p>Rearranging fragmented tables is an O(N^2)
operation.</p>
<p>Own Id: OTP-6300</p>
</item>
</list>
</section>
</section>
<section>
<title>Mnesia 4.3.5</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>The internal index tables on bag tables where not always
cleaned correctly. Thanks Christopher Faulet and Salazard
Remy.</p>
<p>Own Id: OTP-6587</p>
</item>
<item>
<p>Changing the copy type with
<c>mnesia:change_table_copy/3</c> on a node which was down
was not handled correctly, that caused an eternal table
lock on the alive nodes. Thanks Hal Snyder.</p>
<p>Own
Id: OTP-6709</p>
</item>
</list>
</section>
<section>
<title>Known Bugs and Problems</title>
<list type="bulleted">
<item>
<p>Rearranging fragmented tables is an O(N^2)
operation.</p>
<p>Own Id: OTP-6300</p>
</item>
</list>
</section>
</section>
<section>
<title>Mnesia 4.3.4</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>Adding fragments to ram_copies tables was allowed on
nodes that where down.</p>
<p>Own Id: OTP-6367</p>
</item>
<item>
<p>Mnesia leaked transaction decisions (memory and disk
space).</p>
<p>Own Id: OTP-6464</p>
</item>
<item>
<p><c>dirty_update_counter/3</c> did not work properly on
disc tables when the counter was not initiated (Thanks to
Sebastien Saint-Sevin).</p>
<p>Own Id: OTP-6545</p>
</item>
<item>
<p>Chunked <c>mnesia:select</c> on fragmented tables could
crash (Thanks to Primanathan Reddy).</p>
<p>Own Id:
OTP-6548</p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>Introduced a new configure parameter dc_dump_limit.</p>
<p>Removed dead code (dialyzer warnings) and debugging
features that called interpreter commands.</p>
<p>Minor
performance increase when a lot of simultaneous
transactions where active. </p>
<p>Thank you Scott Lystig
Fritchie for debugging and bug reports.</p>
<p>Own Id:
OTP-6478</p>
</item>
</list>
</section>
<section>
<title>Known Bugs and Problems</title>
<list type="bulleted">
<item>
<p>Rearranging fragmented tables is an O(N^2)
operation.</p>
<p>Own Id: OTP-6300</p>
</item>
</list>
</section>
</section>
<section>
<title>Mnesia 4.3.3</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>Mnesia could crash during startup when loading tables
from remote node. </p>
<p>Own Id: OTP-6298 Aux Id: seq10402 </p>
</item>
<item>
<p>Mnesia could fail to update all copies during
del_table_copy. </p>
<p>Own Id: OTP-6299</p>
</item>
</list>
</section>
<section>
<title>Known Bugs and Problems</title>
<list type="bulleted">
<item>
<p>Rearranging fragmented tables is an O(N^2) operation.</p>
<p>Own Id: OTP-6300</p>
</item>
</list>
</section>
</section>
<section>
<title>Mnesia 4.3.2</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>Mnesia sometimes failed to remove [d]ets table fixation,
when using <c>mnesia:first/1</c>,<c>mnesia:next/2</c> or
<c>qlc</c> this could cause that deleted records are not
actually deleted in the [d]ets table and that
<c>mnesia:[dirty_]first/1</c> reported the wrong key. </p>
<p>Own Id: OTP-6193 Aux Id: seq10376</p>
</item>
</list>
</section>
</section>
<section>
<title>Mnesia 4.3.1</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>Mnesia could crash (bad match in mnesia_controller)
during start. </p>
<p>Own Id: OTP-6116 Aux Id: seq10305 </p>
</item>
</list>
</section>
</section>
<section>
<title>Mnesia 4.3</title>
<section>
<title>Fixed Bugs and Malfunctions</title>
<list type="bulleted">
<item>
<p>Deleting tables during the start of mnesia on another
node caused problems. </p>
<p>Own Id: OTP-5928 Aux Id:
seq10111 </p>
</item>
<item>
<p>Killing processes that runs nested transactions could
crash mnesia. </p>
<p>Own Id: OTP-6027 Aux Id: seq10244 </p>
</item>
<item>
<p>Creating or deleting tables with a checkpoint activated
could crash mnesia </p>
<p>Own Id: OTP-6064</p>
</item>
<item>
<p>Table loading could be mixed with schema operations
which could cause troubles. </p>
<p>Own Id: OTP-6065 Aux Id:
seq10291 </p>
</item>
</list>
</section>
<section>
<title>Improvements and New Features</title>
<list type="bulleted">
<item>
<p>Added parallel table loaders to increase startup
performance when the system have many small tables. The
configuration variable <c>no_table_loaders</c> configures
the number of loaders, default is two. </p>
<p>Own Id:
OTP-6087</p>
</item>
</list>
</section>
</section>
</chapter>
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