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Thomas Dietrich 64d0e42294 Update v2.1 and add v2.2 articles (static) 
Fixes #619

Signed-off-by: Thomas Dietrich <Thomas.Dietrich@tu-ilmenau.de>
 		2018-01-07 19:11:31 +01:00
..
readme.html Update v2.1 and add v2.2 articles (static) 2018-01-07 19:11:31 +01:00

readme.html

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<h1 id="mapdb-persistence">mapdb Persistence</h1>

<p>The <a href="http://www.mapdb.org/">mapdb</a> Persistence Service is based on simple key-value store that only saves the last value. The intention is to use this for <code class="highlighter-rouge">restoreOnStartup</code> items because all other persistence options have their drawbacks if values are only needed for reload.  They:</p>

<ul>
  <li>grow in time</li>
  <li>require complex installs (<code class="highlighter-rouge">mysql</code>, <code class="highlighter-rouge">influxdb</code>, …)</li>
  <li><code class="highlighter-rouge">rrd4j</code> can’t store all item types (only numeric types)</li>
</ul>

<p>Querying the mapdb persistence service for historic values other than the last value make no sense since the persistence service can only store one value per item.</p>

<h2 id="configuration">Configuration</h2>

<p>This service can be configured in the file <code class="highlighter-rouge">services/mapdb.cfg</code>.</p>

<table>
  <thead>
    <tr>
      <th>Property</th>
      <th>Default</th>
      <th style="text-align: center">Required</th>
      <th>Description</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>commitinterval</td>
      <td>5</td>
      <td style="text-align: center">No</td>
      <td>commit interval in seconds</td>
    </tr>
    <tr>
      <td>commitsamestate</td>
      <td>false</td>
      <td style="text-align: center">No</td>
      <td>set to <code class="highlighter-rouge">true</code> to issue a commit even if the state did not change</td>
    </tr>
  </tbody>
</table>

<p>All item and event related configuration is done in the file <code class="highlighter-rouge">persistence/mapdb.persist</code>.</p>

<p>To configure this service as the default persistence service for openHAB 2, add or change the line</p>

<div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>org.eclipse.smarthome.persistence:default=mapdb
</code></pre></div></div>

<p>in the file <code class="highlighter-rouge">services/runtime.cfg</code>.</p>

<h2 id="troubleshooting">Troubleshooting</h2>

<p>Restore of items after startup is taking some time. Rules are already started in parallel. Especially in rules that are started via <code class="highlighter-rouge">System started</code> trigger, it may happen that the restore is not completed resulting in undefined items. In these cases the use of restored items has to be delayed by a couple of seconds. This delay has to be determined experimentally.</p>

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