<div id="docs-body">
 <div class="section">
  <div class="titlepage">
   <div>
    <div>
     <h3 class="title">
      <a name="mysql-cluster-disk-data">
      </a>
      25.6.11 NDB Cluster Disk Data Tables
     </h3>
    </div>
   </div>
  </div>
  <div class="toc">
   <dl class="toc">
    <dt>
     <span class="section">
      <a href="mysql-cluster-disk-data-objects.html">
       25.6.11.1 NDB Cluster Disk Data Objects
      </a>
     </span>
    </dt>
    <dt>
     <span class="section">
      <a href="mysql-cluster-disk-data-storage-requirements.html">
       25.6.11.2 NDB Cluster Disk Data Storage Requirements
      </a>
     </span>
    </dt>
   </dl>
  </div>
  <a class="indexterm" name="idm46045091734176">
  </a>
  <a class="indexterm" name="idm46045091733136">
  </a>
  <a class="indexterm" name="idm46045091731232">
  </a>
  <p>
   NDB Cluster supports storing nonindexed columns of
   <a class="link" href="mysql-cluster.html" title="Chapter 25 MySQL NDB Cluster 8.4">
    <code class="literal">
     NDB
    </code>
   </a>
   tables on disk, rather than in
      RAM. Column data and logging metadata are kept in data files and
      undo log files, conceptualized as tablespaces and log file groups,
      as described in the next section—see
   <a class="xref" href="mysql-cluster-disk-data-objects.html" title="25.6.11.1 NDB Cluster Disk Data Objects">
    Section 25.6.11.1, “NDB Cluster Disk Data Objects”
   </a>
   .
  </p>
  <p>
   NDB Cluster Disk Data performance can be influenced by a number of
      configuration parameters. For information about these parameters
      and their effects, see
   <a class="xref" href="mysql-cluster-ndbd-definition.html#mysql-cluster-ndbd-definition-disk-data-parameters" title="Disk Data Configuration Parameters">
    Disk Data Configuration Parameters
   </a>
   ,
      and
   <a class="xref" href="mysql-cluster-ndbd-definition.html#mysql-cluster-ndbd-definition-gcp-stop-errors" title="Disk Data and GCP Stop errors">
    Disk Data and GCP Stop errors
   </a>
   .
  </p>
  <p>
   You should also set the
   <a class="link" href="mysql-cluster-ndbd-definition.html#ndbparam-ndbd-diskdatausingsamedisk">
    <code class="literal">
     DiskDataUsingSameDisk
    </code>
   </a>
   data
      node configuration parameter to
   <code class="literal">
    false
   </code>
   when
      using separate disks for Disk Data files.
  </p>
  <p>
   For more information, see the following:
  </p>
  <div class="itemizedlist">
   <ul class="itemizedlist" style="list-style-type: disc; ">
    <li class="listitem">
     <p>
      <a class="xref" href="mysql-cluster-ndbd-definition.html#mysql-cluster-ndbd-disk-data-filesystem-parameters" title="Disk Data file system parameters">
       Disk Data file system parameters
      </a>
      .
     </p>
    </li>
    <li class="listitem">
     <p>
      <a class="xref" href="mysql-cluster-ndbd-definition.html#mysql-cluster-ndbd-definition-disk-data-latency-parameters" title="Disk Data latency parameters">
       Disk Data latency parameters
      </a>
     </p>
    </li>
    <li class="listitem">
     <p>
      <a class="xref" href="mysql-cluster-ndbinfo-diskstat.html" title="25.6.17.32 The ndbinfo diskstat Table">
       Section 25.6.17.32, “The ndbinfo diskstat Table”
      </a>
     </p>
    </li>
    <li class="listitem">
     <p>
      <a class="xref" href="mysql-cluster-ndbinfo-diskstats-1sec.html" title="25.6.17.33 The ndbinfo diskstats_1sec Table">
       Section 25.6.17.33, “The ndbinfo diskstats_1sec Table”
      </a>
     </p>
    </li>
    <li class="listitem">
     <p>
      <a class="xref" href="mysql-cluster-ndbinfo-pgman-time-track-stats.html" title="25.6.17.50 The ndbinfo pgman_time_track_stats Table">
       Section 25.6.17.50, “The ndbinfo pgman_time_track_stats Table”
      </a>
     </p>
    </li>
   </ul>
  </div>
 </div>
 <br/>
</div>
