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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/mnesia-4.4.13.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>Mnesia</strong><br><strong>Release Notes</strong><br><small>Version 4.4.13</small></p>
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<ul class="flipMenu" imagepath="../../../../doc/js/flipmenu"><li id="loadscrollpos" title="Mnesia Release Notes" expanded="true">Mnesia Release Notes<ul>
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<li title="Mnesia 4.4.13"><a href="notes.html#id2260273">Mnesia 4.4.13</a></li>
<li title="Mnesia 4.4.12"><a href="notes.html#id2260329">Mnesia 4.4.12</a></li>
<li title="Mnesia 4.4.11"><a href="notes.html#id2260361">Mnesia 4.4.11</a></li>
<li title="Mnesia 4.4.10"><a href="notes.html#id2254294">Mnesia 4.4.10</a></li>
<li title="Mnesia 4.4.9"><a href="notes.html#id2254362">Mnesia 4.4.9</a></li>
<li title="Mnesia 4.4.8"><a href="notes.html#id2254397">Mnesia 4.4.8</a></li>
<li title="Mnesia 4.4.7"><a href="notes.html#id2259804">Mnesia 4.4.7</a></li>
<li title="Mnesia 4.4.6"><a href="notes.html#id2259899">Mnesia 4.4.6</a></li>
<li title="Mnesia 4.4.5"><a href="notes.html#id2259938">Mnesia 4.4.5</a></li>
<li title="Mnesia 4.4.4"><a href="notes.html#id2259971">Mnesia 4.4.4</a></li>
<li title="Mnesia 4.4.3"><a href="notes.html#id2260004">Mnesia 4.4.3</a></li>
<li title="Mnesia 4.4.2"><a href="notes.html#id2254758">Mnesia 4.4.2</a></li>
<li title="Mnesia 4.4.1"><a href="notes.html#id2254829">Mnesia 4.4.1</a></li>
<li title="Mnesia 4.4"><a href="notes.html#id2254890">Mnesia 4.4</a></li>
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<h1>1 Mnesia Release Notes</h1>
<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>
<h3><a name="id2260273">1.1
Mnesia 4.4.13</a></h3>
<h4>Fixed Bugs and Malfunctions</h4>
<ul>
<li>
<p>
Transactions could be left hanging if a node went down
when invoking mnesia:sync_transaction/[1,2]. Thanks Igor
Ribeiro Sucupira.</p>
<p>
Own Id: OTP-8402</p>
</li>
</ul>
<h4>Improvements and New Features</h4>
<ul>
<li>
<p>
Igor Ribeiro Sucupira added the option to compress data
when copying tables between Mnesia nodes.</p>
<p>
Own Id: OTP-8406</p>
</li>
</ul>
<h3><a name="id2260329">1.2
Mnesia 4.4.12</a></h3>
<h4>Improvements and New Features</h4>
<ul>
<li>
<p>
The documentation is now built with open source tools
(xsltproc and fop) that exists on most platforms. One
visible change is that the frames are removed.</p>
<p>
Own Id: OTP-8250</p>
</li>
</ul>
<h3><a name="id2260361">1.3
Mnesia 4.4.11</a></h3>
<h4>Improvements and New Features</h4>
<ul>
<li>
<p>
Fixed duplicate results with mnesia:index_read() on
ordered_set tables. Reported by Sam Bobroff. </p>
<p>
Fixed locking in mnesia:index_read() which now grabs a read
table lock to ensure correctness, this may slow down the
operation or block other processes trying to reach the
same table. </p>
<p>
Calling mnesia:dump_log() could crash mnesia,
Reported by Igor Ribeiro Sucupira.</p>
<p> Own Id: OTP-8074</p>
</li>
</ul>
<h3><a name="id2254294">1.4
Mnesia 4.4.10</a></h3>
<h4>Fixed Bugs and Malfunctions</h4>
<ul>
<li>
<p>
Mnesia crashed if a qlc query was running inside a
transaction when mnesia stopped at another node. Thanks
Teemu Antti-Poika.</p>
<p>
Own Id: OTP-7968</p>
</li>
<li>
<p>
Mnesia could crash when loading local_content tables.</p>
<p>
Own Id: OTP-8002 Aux Id: seq11277 </p>
</li>
</ul>
<h4>Improvements and New Features</h4>
<ul>
<li>
<p>
Minor (smp) optimizations.</p>
<p>
Own Id: OTP-7928</p>
</li>
</ul>
<h3><a name="id2254362">1.5
Mnesia 4.4.9</a></h3>
<h4>Fixed Bugs and Malfunctions</h4>
<ul>
<li>
<p>
mnesia:clear_table/1 crashed instead of returning
<span class="code">{aborted,..}</span> if it was called inside a
transaction.</p>
<p>
Own Id: OTP-7911</p>
</li>
</ul>
<h3><a name="id2254397">1.6
Mnesia 4.4.8</a></h3>
<h4>Fixed Bugs and Malfunctions</h4>
<ul>
<li>
<p>
With bad timing several api functions could return or
exit with a bad error message when mnesia was shutting
down.</p>
<p>
Own Id: OTP-7753 Aux Id: seq11179 </p>
</li>
<li>
<p>
<span class="code">mnesia:clear_table/1</span> cleared all nodes table
content even if the table was <span class="code">local_content</span> only
type.</p>
<p>
Own Id: OTP-7835</p>
</li>
</ul>
<h3><a name="id2259804">1.7
Mnesia 4.4.7</a></h3>
<h4>Fixed Bugs and Malfunctions</h4>
<ul>
<li>
<p>
Disallowed match patterns ('_', and '$n') as argument to
<span class="code">mnesia:delete_object/1</span> and friends.</p>
<p>
Own Id: OTP-7524</p>
</li>
</ul>
<h4>Improvements and New Features</h4>
<ul>
<li>
<p>
Introduced a few new functions in Mnesia: <span class="code">mnesia:read/2</span>,
<span class="code">mnesia:first/3</span>, <span class="code">mnesia:last/3</span>, <span class="code">mnesia:prev/4</span>,
<span class="code">mnesia:next/4</span>, <span class="code">mnesia_frag:first/1</span>, <span class="code">mnesia_frag:last/1</span>,
<span class="code">mnesia_frag:prev/2</span>, <span class="code">mnesia_frag:next/2</span>.</p>
<p>
Own Id: OTP-7625</p>
</li>
</ul>
<h3><a name="id2259899">1.8
Mnesia 4.4.6</a></h3>
<h4>Fixed Bugs and Malfunctions</h4>
<ul>
<li>
<p>
<span class="code">mnesia:restore/2</span> aborted if a <span class="code">EXIT</span> message
appeared in the client message queue.</p>
<p>
Own Id: OTP-7585 Aux Id: seq11046 </p>
</li>
</ul>
<h3><a name="id2259938">1.9
Mnesia 4.4.5</a></h3>
<h4>Improvements and New Features</h4>
<ul>
<li>
<p>
mnesia:clear_table/1 does not require that all
replicas of the table are available anymore.</p>
<p>
Own Id: OTP-7466 Aux Id: seq11015</p>
</li>
</ul>
<h3><a name="id2259971">1.10
Mnesia 4.4.4</a></h3>
<h4>Fixed Bugs and Malfunctions</h4>
<ul>
<li>
<p>
Mnesia did not garbage collect transaction decisions on
disk based nodes if no transactions where made on the
local node.</p>
<p>
Own Id: OTP-7419</p>
</li>
</ul>
<h3><a name="id2260004">1.11
Mnesia 4.4.3</a></h3>
<h4>Fixed Bugs and Malfunctions</h4>
<ul>
<li>
<p>
Table referred to by foreign key did not have node_pool
properly cleaned up when a node was removed from the
schema. Thanks Paul Mineiro.</p>
<p>
Own Id: OTP-7340</p>
</li>
<li>
<p>
Mnesia crashed and generated a core dump if a
schema_transaction was running when mnesia stopped.</p>
<p>
Own Id: OTP-7378 Aux Id: seq10964 </p>
</li>
</ul>
<h4>Improvements and New Features</h4>
<ul>
<li>
<p>
It is now possible to delete a db node even when other
disk resident nodes are down. Thanks Paul Mineiro.</p>
<p>
Own Id: OTP-7383</p>
</li>
</ul>
<h3><a name="id2254758">1.12
Mnesia 4.4.2</a></h3>
<h4>Fixed Bugs and Malfunctions</h4>
<ul>
<li>
<p>
Sticky locks could lead to hanging transactions.</p>
<p>
Own Id: OTP-7205 Aux Id: seq10793 </p>
</li>
<li>
<p>
<span class="code">mnesia:snmp_get_next_index/2</span> didn't work with
partial index keys. Argument checking is now done
according to documentation, in functions
<span class="code">mnesia:snmp_get_row/2</span>,
<span class="code">mnesia:snmp_get_mnesia_key/2</span> and
<span class="code">mnesia:snmp_get_next_index/2</span>. These functions now
require that <span class="code">RowIndex</span> is a list.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-7208</p>
</li>
</ul>
<h3><a name="id2254829">1.13
Mnesia 4.4.1</a></h3>
<h4>Fixed Bugs and Malfunctions</h4>
<ul>
<li>
<p>
Snmp index tables was not initialized correctly in
<span class="code">mnesia-4.4</span>.</p>
<p>
Own Id: OTP-7170 Aux Id: seq10870 </p>
</li>
</ul>
<h4>Known Bugs and Problems</h4>
<ul>
<li>
<p>
Rearranging fragmented tables is an O(N^2) operation.</p>
<p>
Own Id: OTP-6300</p>
</li>
</ul>
<h3><a name="id2254890">1.14
Mnesia 4.4</a></h3>
<h4>Fixed Bugs and Malfunctions</h4>
<ul>
<li>
<p>
Mnesia ignored the module argument to
<span class="code">mnesia:restore/2</span>. Thanks Paul Minerio.</p>
<p>
Own Id: OTP-6981</p>
</li>
</ul>
<h4>Improvements and New Features</h4>
<ul>
<li>
<p>
Mnesia's snmp operations <span class="code">snmp_get_row/2</span>,
<span class="code">snmp_get_next_index/2</span> and
<span class="code">snmp_get_mnesia_key/2</span> have been made context
aware, i.e. inside a transaction they will compensate for
table updates made in earlier in the same transaction.
This might cause a performance drop if a lot of updates
have been made before the invocation of these functions.</p>
<p>
*** POTENTIAL INCOMPATIBILITY ***</p>
<p>
Own Id: OTP-6856 Aux Id: seq10671 </p>
</li>
<li>
<p>
Introduced erlang:phash/2 as new default for fragmented
tables. Already existing tables will continue to use
whatever hash function they where using.</p>
<p>
Own Id: OTP-6923</p>
</li>
<li>
<p>
Introduced <span class="code">mnesia:is_transaction/0</span>.</p>
<p>
Own Id: OTP-6995 Aux Id: seq10812 </p>
</li>
</ul>
<h4>Known Bugs and Problems</h4>
<ul>
<li>
<p>
Rearranging fragmented tables is an O(N^2) operation.</p>
<p>
Own Id: OTP-6300</p>
</li>
</ul>
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