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     <h3 class="title">
      <a name="mysql-cluster-replication-abbreviations">
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      25.7.1 NDB Cluster Replication: Abbreviations and Symbols
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  <p>
   Throughout this section, we use the following abbreviations or
      symbols for referring to the source and replica clusters, and to
      processes and commands run on the clusters or cluster nodes:
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    <b>
     Table 25.41 Abbreviations used throughout this section referring to source
        and replica clusters, and to processes and
commands run on cluster nodes
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     <colgroup>
      <col style="width: 25%"/>
      <col style="width: 75%"/>
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     <thead>
      <tr>
       <th>
        Symbol or Abbreviation
       </th>
       <th>
        Description (Refers to...)
       </th>
      </tr>
     </thead>
     <tbody>
      <tr>
       <td>
        <em class="replaceable">
         <code>
          S
         </code>
        </em>
       </td>
       <td>
        The cluster serving as the (primary) replication source
       </td>
      </tr>
      <tr>
       <td>
        <em class="replaceable">
         <code>
          R
         </code>
        </em>
       </td>
       <td>
        The cluster acting as the (primary) replica
       </td>
      </tr>
      <tr>
       <td>
        <code class="literal">
         shell
         <em class="replaceable">
          <code>
           S
          </code>
         </em>
         &gt;
        </code>
       </td>
       <td>
        Shell command to be issued on the source cluster
       </td>
      </tr>
      <tr>
       <td>
        <code class="literal">
         mysql
         <em class="replaceable">
          <code>
           S
          </code>
         </em>
         &gt;
        </code>
       </td>
       <td>
        MySQL client command issued on a single MySQL server running as an SQL
            node on the source cluster
       </td>
      </tr>
      <tr>
       <td>
        <code class="literal">
         mysql
         <em class="replaceable">
          <code>
           S*
          </code>
         </em>
         &gt;
        </code>
       </td>
       <td>
        MySQL client command to be issued on all SQL nodes participating in the
            replication source cluster
       </td>
      </tr>
      <tr>
       <td>
        <code class="literal">
         shell
         <em class="replaceable">
          <code>
           R
          </code>
         </em>
         &gt;
        </code>
       </td>
       <td>
        Shell command to be issued on the replica cluster
       </td>
      </tr>
      <tr>
       <td>
        <code class="literal">
         mysql
         <em class="replaceable">
          <code>
           R
          </code>
         </em>
         &gt;
        </code>
       </td>
       <td>
        MySQL client command issued on a single MySQL server running as an SQL
            node on the replica cluster
       </td>
      </tr>
      <tr>
       <td>
        <code class="literal">
         mysql
         <em class="replaceable">
          <code>
           R*
          </code>
         </em>
         &gt;
        </code>
       </td>
       <td>
        MySQL client command to be issued on all SQL nodes participating in the
            replica cluster
       </td>
      </tr>
      <tr>
       <td>
        <em class="replaceable">
         <code>
          C
         </code>
        </em>
       </td>
       <td>
        Primary replication channel
       </td>
      </tr>
      <tr>
       <td>
        <em class="replaceable">
         <code>
          C'
         </code>
        </em>
       </td>
       <td>
        Secondary replication channel
       </td>
      </tr>
      <tr>
       <td>
        <em class="replaceable">
         <code>
          S'
         </code>
        </em>
       </td>
       <td>
        Secondary replication source
       </td>
      </tr>
      <tr>
       <td>
        <em class="replaceable">
         <code>
          R'
         </code>
        </em>
       </td>
       <td>
        Secondary replica
       </td>
      </tr>
     </tbody>
    </table>
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     <thead>
      <tr>
       <th style="width: 184.5px;">
        Symbol or Abbreviation
       </th>
       <th style="width: 553.5px;">
        Description (Refers to...)
       </th>
      </tr>
     </thead>
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