<div id="docs-body">
 <div class="section">
  <div class="titlepage">
   <div>
    <div>
     <h3 class="title">
      <a name="mysql-cluster-mgm-client-commands">
      </a>
      25.6.1 Commands in the NDB Cluster Management Client
     </h3>
    </div>
   </div>
  </div>
  <a class="indexterm" name="idm46045094630320">
  </a>
  <a class="indexterm" name="idm46045094628832">
  </a>
  <a class="indexterm" name="idm46045094627344">
  </a>
  <p>
   In addition to the central configuration file, a cluster may also
      be controlled through a command-line interface available through
      the management client
   <a class="link" href="mysql-cluster-programs-ndb-mgm.html" title="25.5.5 ndb_mgm — The NDB Cluster Management Client">
    <span class="command">
     <strong>
      ndb_mgm
     </strong>
    </span>
   </a>
   . This is the
      primary administrative interface to a running cluster.
  </p>
  <p>
   Commands for the event logs are given in
   <a class="xref" href="mysql-cluster-event-reports.html" title="25.6.3 Event Reports Generated in NDB Cluster">
    Section 25.6.3, “Event Reports Generated in NDB Cluster”
   </a>
   ; commands for
      creating backups and restoring from them are provided in
   <a class="xref" href="mysql-cluster-backup.html" title="25.6.8 Online Backup of NDB Cluster">
    Section 25.6.8, “Online Backup of NDB Cluster”
   </a>
   .
  </p>
  <p>
   <b>
    Using ndb_mgm with MySQL Cluster Manager.
   </b>
   <a class="indexterm" name="idm46045094621152">
   </a>
   <a class="indexterm" name="idm46045094619648">
   </a>
   MySQL Cluster Manager handles starting and stopping processes and tracks their
        states internally, so it is not necessary to use
   <a class="link" href="mysql-cluster-programs-ndb-mgm.html" title="25.5.5 ndb_mgm — The NDB Cluster Management Client">
    <span class="command">
     <strong>
      ndb_mgm
     </strong>
    </span>
   </a>
   for these tasks for an NDB Cluster
        that is under MySQL Cluster Manager control. It is recommended
   <span class="emphasis">
    <em>
     not
    </em>
   </span>
   to use the
   <a class="link" href="mysql-cluster-programs-ndb-mgm.html" title="25.5.5 ndb_mgm — The NDB Cluster Management Client">
    <span class="command">
     <strong>
      ndb_mgm
     </strong>
    </span>
   </a>
   command-line client that comes with the NDB Cluster distribution
        to perform operations that involve starting or stopping nodes.
        These include but are not limited to the
   <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-start">
    <code class="literal">
     START
    </code>
   </a>
   ,
   <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-stop">
    <code class="literal">
     STOP
    </code>
   </a>
   ,
   <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-restart">
    <code class="literal">
     RESTART
    </code>
   </a>
   , and
   <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-shutdown">
    <code class="literal">
     SHUTDOWN
    </code>
   </a>
   commands. For more
        information, see
   <a class="ulink" href="/doc/mysql-cluster-manager/8.4/en/mcm-process-commands.html" target="_top">
    MySQL Cluster Manager Process Commands
   </a>
   .
  </p>
  <p>
   The management client has the following basic commands. In the
      listing that follows,
   <em class="replaceable">
    <code>
     node_id
    </code>
   </em>
   denotes
      either a data node ID or the keyword
   <code class="literal">
    ALL
   </code>
   , which
      indicates that the command should be applied to all of the
      cluster's data nodes.
  </p>
  <div class="itemizedlist">
   <ul class="itemizedlist" style="list-style-type: disc; ">
    <li class="listitem">
     <p>
      <a name="ndbclient-connect">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-connect">
       <code class="literal">
        CONNECT
        <em class="replaceable">
         <code>
          connection-string
         </code>
        </em>
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094603824">
     </a>
     <a class="indexterm" name="idm46045094602336">
     </a>
     <p>
      Connects to the management server indicated by the connection
          string. If the client is already connected to this server, the
          client reconnects.
     </p>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-create-nodegroup">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-create-nodegroup">
       <code class="literal">
        CREATE NODEGROUP
        <em class="replaceable">
         <code>
          nodeid
         </code>
        </em>
        [,
        <em class="replaceable">
         <code>
          nodeid
         </code>
        </em>
        , ...]
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094597184">
     </a>
     <a class="indexterm" name="idm46045094595680">
     </a>
     <p>
      Creates a new NDB Cluster node group and causes data nodes to
          join it.
     </p>
     <p>
      This command is used after adding new data nodes online to an
          NDB Cluster, and causes them to join a new node group and thus
          to begin participating fully in the cluster. The command takes
          as its sole parameter a comma-separated list of node
          IDs—these are the IDs of the nodes just added and
          started, and that are to join the new node group. The list
          must contain no duplicate IDs; the presence of any duplicates
          causes the command to return an error. The number of nodes in
          the list must be the same as the number of nodes in each node
          group that is already part of the cluster (each NDB Cluster
          node group must have the same number of nodes). In other
          words, if the NDB Cluster consists of 2 node groups having 2
          data nodes each, then the new node group must also have 2 data
          nodes.
     </p>
     <p>
      The node group ID of the new node group created by this
          command is determined automatically, and always the next
          highest unused node group ID in the cluster; it is not
          possible to set it manually.
     </p>
     <p>
      For more information, see
      <a class="xref" href="mysql-cluster-online-add-node.html" title="25.6.7 Adding NDB Cluster Data Nodes Online">
       Section 25.6.7, “Adding NDB Cluster Data Nodes Online”
      </a>
      .
     </p>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-drop-nodegroup">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-drop-nodegroup">
       <code class="literal">
        DROP NODEGROUP
        <em class="replaceable">
         <code>
          nodegroup_id
         </code>
        </em>
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094587840">
     </a>
     <a class="indexterm" name="idm46045094586352">
     </a>
     <p>
      Drops the NDB Cluster node group with the given
      <em class="replaceable">
       <code>
        nodegroup_id
       </code>
      </em>
      .
     </p>
     <p>
      This command can be used to drop a node group from an NDB
          Cluster.
      <code class="literal">
       DROP NODEGROUP
      </code>
      takes as its sole
          argument the node group ID of the node group to be dropped.
     </p>
     <p>
      <code class="literal">
       DROP NODEGROUP
      </code>
      acts only to remove the data
          nodes in the effected node group from that node group. It does
          not stop data nodes, assign them to a different node group, or
          remove them from the cluster's configuration. A data node
          that does not belong to a node group is indicated in the
          output of the management client
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-show">
       <code class="literal">
        SHOW
       </code>
      </a>
      command with
      <code class="literal">
       no nodegroup
      </code>
      in place of the node group ID,
          like this (indicated using bold text):
     </p>
     <div class="copytoclipboard-wrapper">
      <pre class="programlisting one-line language-simple"><div class="docs-select-all right" id="sa39078685"><div class="copy-help left">Press ⌘+C to copy</div> <div class="right"><button class="clipboard-btn" title="Copy to Clipboard"><span class="icon-clipboard"></span></button></div></div><code class="language-simple">id<span class="token operator">=</span>3    @10<span class="token punctuation">.</span>100<span class="token punctuation">.</span>2<span class="token punctuation">.</span>67  <span class="token punctuation">(</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0<span class="token operator">-</span>ndb<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0<span class="token punctuation">,</span> no nodegroup<span class="token punctuation">)</span></code></pre>
     </div>
     <p>
      <code class="literal">
       DROP NODEGROUP
      </code>
      works only when all data
          nodes in the node group to be dropped are completely empty of
          any table data and table definitions. Since there is currently
          no way using
      <a class="link" href="mysql-cluster-programs-ndb-mgm.html" title="25.5.5 ndb_mgm — The NDB Cluster Management Client">
       <span class="command">
        <strong>
         ndb_mgm
        </strong>
       </span>
      </a>
      or the
      <a class="link" href="mysql.html" title="6.5.1 mysql — The MySQL Command-Line Client">
       <span class="command">
        <strong>
         mysql
        </strong>
       </span>
      </a>
      client to remove all data from a
          specific data node or node group, this means that the command
          succeeds only in the two following cases:
     </p>
     <div class="orderedlist">
      <ol class="orderedlist" type="1">
       <li class="listitem">
        <p>
         After issuing
         <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-create-nodegroup">
          <code class="literal">
           CREATE
              NODEGROUP
          </code>
         </a>
         in the
         <a class="link" href="mysql-cluster-programs-ndb-mgm.html" title="25.5.5 ndb_mgm — The NDB Cluster Management Client">
          <span class="command">
           <strong>
            ndb_mgm
           </strong>
          </span>
         </a>
         client, but before issuing any
         <a class="link" href="alter-table.html" title="15.1.9 ALTER TABLE Statement">
          <code class="literal">
           ALTER TABLE
              ... REORGANIZE PARTITION
          </code>
         </a>
         statements in the
         <a class="link" href="mysql.html" title="6.5.1 mysql — The MySQL Command-Line Client">
          <span class="command">
           <strong>
            mysql
           </strong>
          </span>
         </a>
         client.
        </p>
       </li>
       <li class="listitem">
        <p>
         After dropping all
         <a class="link" href="mysql-cluster.html" title="Chapter 25 MySQL NDB Cluster 8.4">
          <code class="literal">
           NDBCLUSTER
          </code>
         </a>
         tables using
         <a class="link" href="drop-table.html" title="15.1.32 DROP TABLE Statement">
          <code class="literal">
           DROP TABLE
          </code>
         </a>
         .
        </p>
        <p>
         <a class="link" href="truncate-table.html" title="15.1.37 TRUNCATE TABLE Statement">
          <code class="literal">
           TRUNCATE TABLE
          </code>
         </a>
         does not
              work for this purpose because this removes only the table
              data; the data nodes continue to store an
         <a class="link" href="mysql-cluster.html" title="Chapter 25 MySQL NDB Cluster 8.4">
          <code class="literal">
           NDBCLUSTER
          </code>
         </a>
         table's
              definition until a
         <a class="link" href="drop-table.html" title="15.1.32 DROP TABLE Statement">
          <code class="literal">
           DROP
              TABLE
          </code>
         </a>
         statement is issued that causes the table
              metadata to be dropped.
        </p>
       </li>
      </ol>
     </div>
     <p>
      For more information about
      <code class="literal">
       DROP NODEGROUP
      </code>
      ,
          see
      <a class="xref" href="mysql-cluster-online-add-node.html" title="25.6.7 Adding NDB Cluster Data Nodes Online">
       Section 25.6.7, “Adding NDB Cluster Data Nodes Online”
      </a>
      .
     </p>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-enter-single-user-mode">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-enter-single-user-mode">
       <code class="literal">
        ENTER SINGLE USER MODE
        <em class="replaceable">
         <code>
          node_id
         </code>
        </em>
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094554832">
     </a>
     <a class="indexterm" name="idm46045094553344">
     </a>
     <a class="indexterm" name="idm46045094552256">
     </a>
     <a class="indexterm" name="idm46045094550752">
     </a>
     <p>
      Enters single user mode, whereby only the MySQL server
          identified by the node ID
      <em class="replaceable">
       <code>
        node_id
       </code>
      </em>
      is permitted to access the database.
     </p>
     <p>
      The
      <a class="link" href="mysql-cluster-programs-ndb-mgm.html" title="25.5.5 ndb_mgm — The NDB Cluster Management Client">
       <span class="command">
        <strong>
         ndb_mgm
        </strong>
       </span>
      </a>
      client provides a clear
          acknowledgement that this command has been issued and has
          taken effect, as shown here:
     </p>
     <div class="copytoclipboard-wrapper">
      <pre class="programlisting language-ndbmgm"><div class="docs-select-all right" id="sa15491757"><div class="copy-help left">Press ⌘+C to copy</div> <div class="right"><button class="clipboard-btn" title="Copy to Clipboard"><span class="icon-clipboard"></span></button></div></div><code class="language-ndbmgm"><span class="token prompt">ndb_mgm&gt;</span> <span class="token keyword">ENTER SINGLE USER MODE</span> 100
Single user mode entered
Access is granted for API node 100 only<span class="token punctuation">.</span></code></pre>
     </div>
     <p>
      In addition, the API or SQL node having exclusive access when
          in single user mode is indicated in the output of the
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-show">
       <code class="literal">
        SHOW
       </code>
      </a>
      command, like this:
     </p>
     <div class="copytoclipboard-wrapper">
      <pre class="programlisting language-ndbmgm"><div class="docs-select-all right" id="sa79733307"><div class="copy-help left">Press ⌘+C to copy</div> <div class="right"><button class="clipboard-btn" title="Copy to Clipboard"><span class="icon-clipboard"></span></button></div></div><code class="language-ndbmgm"><span class="token prompt">ndb_mgm&gt;</span> <span class="token keyword">SHOW</span>
Cluster Configuration
<span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">-</span>
<span class="token selector">[ndbd(NDB)]</span>     2 node<span class="token punctuation">(</span>s<span class="token punctuation">)</span>
id<span class="token operator">=</span>5    @127<span class="token punctuation">.</span>0<span class="token punctuation">.</span>0<span class="token punctuation">.</span>1  <span class="token punctuation">(</span>mysql<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0 ndb<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0<span class="token punctuation">,</span> single user mode<span class="token punctuation">,</span> Nodegroup<span class="token operator">:</span> 0<span class="token punctuation">,</span> <span class="token operator">*</span><span class="token punctuation">)</span>
id<span class="token operator">=</span>6    @127<span class="token punctuation">.</span>0<span class="token punctuation">.</span>0<span class="token punctuation">.</span>1  <span class="token punctuation">(</span>mysql<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0 ndb<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0<span class="token punctuation">,</span> single user mode<span class="token punctuation">,</span> Nodegroup<span class="token operator">:</span> 0<span class="token punctuation">)</span>

<span class="token selector">[ndb_mgmd(MGM)]</span> 1 node<span class="token punctuation">(</span>s<span class="token punctuation">)</span>
id<span class="token operator">=</span>50   @127<span class="token punctuation">.</span>0<span class="token punctuation">.</span>0<span class="token punctuation">.</span>1  <span class="token punctuation">(</span>mysql<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0 ndb<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0<span class="token punctuation">)</span>

<span class="token selector">[mysqld(API)]</span>   2 node<span class="token punctuation">(</span>s<span class="token punctuation">)</span>
id<span class="token operator">=</span>100  @127<span class="token punctuation">.</span>0<span class="token punctuation">.</span>0<span class="token punctuation">.</span>1  <span class="token punctuation">(</span>mysql<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0 ndb<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0<span class="token punctuation">,</span> allowed single user<span class="token punctuation">)</span>
id<span class="token operator">=</span>101 <span class="token punctuation">(</span>not connected<span class="token punctuation">,</span> accepting connect from any host<span class="token punctuation">)</span></code></pre>
     </div>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-exit-single-user-mode">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-exit-single-user-mode">
       <code class="literal">
        EXIT SINGLE USER MODE
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094539184">
     </a>
     <a class="indexterm" name="idm46045094537728">
     </a>
     <p>
      Exits single user mode, enabling all SQL nodes (that is, all
          running
      <a class="link" href="mysqld.html" title="6.3.1 mysqld — The MySQL Server">
       <span class="command">
        <strong>
         mysqld
        </strong>
       </span>
      </a>
      processes) to access the
          database.
     </p>
     <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
      <div class="admon-title">
       Note
      </div>
      <p>
       It is possible to use
       <code class="literal">
        EXIT SINGLE USER
            MODE
       </code>
       even when not in single user mode, although
            the command has no effect in this case.
      </p>
     </div>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-help">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-help">
       <code class="literal">
        HELP
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094530704">
     </a>
     <a class="indexterm" name="idm46045094529216">
     </a>
     <p>
      Displays information on all available commands.
     </p>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-nodelog-debug">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-nodelog-debug">
       <code class="literal">
        <em class="replaceable">
         <code>
          node_id
         </code>
        </em>
        NODELOG DEBUG {ON|OFF}
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094524960">
     </a>
     <a class="indexterm" name="idm46045094523472">
     </a>
     <p>
      Toggles debug logging in the node log, as though the effected
          data node or nodes had been started with the
      <a class="link" href="mysql-cluster-programs-ndbd.html#option_ndbd_verbose">
       <code class="option">
        --verbose
       </code>
      </a>
      option.
      <code class="literal">
       NODELOG DEBUG ON
      </code>
      starts debug logging;
      <code class="literal">
       NODELOG DEBUG OFF
      </code>
      switches debug logging
          off.
     </p>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-prompt">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-prompt">
       <code class="literal">
        PROMPT
          [
        <em class="replaceable">
         <code>
          prompt
         </code>
        </em>
        ]
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094516464">
     </a>
     <a class="indexterm" name="idm46045094514976">
     </a>
     <p>
      Changes the prompt shown by
      <a class="link" href="mysql-cluster-programs-ndb-mgm.html" title="25.5.5 ndb_mgm — The NDB Cluster Management Client">
       <span class="command">
        <strong>
         ndb_mgm
        </strong>
       </span>
      </a>
      to the
          string literal
      <em class="replaceable">
       <code>
        prompt
       </code>
      </em>
      .
     </p>
     <p>
      <em class="replaceable">
       <code>
        prompt
       </code>
      </em>
      should not be quoted (unless
          you want the prompt to include the quotation marks). Unlike
          the case with the
      <a class="link" href="mysql.html" title="6.5.1 mysql — The MySQL Command-Line Client">
       <span class="command">
        <strong>
         mysql
        </strong>
       </span>
      </a>
      client, special
          character sequences and escapes are not recognized. If called
          without an argument, the command resets the prompt to the
          default value (
      <code class="literal">
       ndb_mgm&gt;
      </code>
      ).
     </p>
     <p>
      Some examples are shown here:
     </p>
     <div class="copytoclipboard-wrapper">
      <pre class="programlisting language-ndbmgm"><div class="docs-select-all right" id="sa36712346"><div class="copy-help left">Press ⌘+C to copy</div> <div class="right"><button class="clipboard-btn" title="Copy to Clipboard"><span class="icon-clipboard"></span></button></div></div><code class="language-ndbmgm"><span class="token prompt">ndb_mgm&gt;</span> <span class="token keyword">PROMPT</span> mgm#1<span class="token operator">:</span>
mgm#1<span class="token operator">:</span> <span class="token keyword">SHOW</span>
Cluster Configuration
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
mgm#1<span class="token operator">:</span> <span class="token keyword">PROMPT</span> mymgm <span class="token operator">&gt;</span>
mymgm <span class="token operator">&gt;</span> <span class="token keyword">PROMPT</span> 'mymgm<span class="token operator">:</span>'
'mymgm<span class="token operator">:</span>' <span class="token keyword">PROMPT</span>  mymgm<span class="token operator">:</span>
mymgm<span class="token operator">:</span> <span class="token keyword">PROMPT</span>
<span class="token prompt">ndb_mgm&gt;</span> <span class="token keyword">EXIT</span>
$<span class="token operator">&gt;</span></code></pre>
     </div>
     <p>
      Note that leading spaces and spaces within the
      <em class="replaceable">
       <code>
        prompt
       </code>
      </em>
      string are not trimmed.
          Trailing spaces are removed.
     </p>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-quit">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-quit">
       <code class="literal">
        QUIT
       </code>
      </a>
      ,
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-quit">
       <code class="literal">
        EXIT
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094497536">
     </a>
     <a class="indexterm" name="idm46045094496048">
     </a>
     <a class="indexterm" name="idm46045094494960">
     </a>
     <a class="indexterm" name="idm46045094493472">
     </a>
     <p>
      Terminates the management client.
     </p>
     <p>
      This command does not affect any nodes connected to the
          cluster.
     </p>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-report">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-report">
       <code class="literal">
        <em class="replaceable">
         <code>
          node_id
         </code>
        </em>
        REPORT
        <em class="replaceable">
         <code>
          report-type
         </code>
        </em>
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094488464">
     </a>
     <a class="indexterm" name="idm46045094486976">
     </a>
     <p>
      Displays a report of type
      <em class="replaceable">
       <code>
        report-type
       </code>
      </em>
      for the data node
          identified by
      <em class="replaceable">
       <code>
        node_id
       </code>
      </em>
      , or for all
          data nodes using
      <code class="literal">
       ALL
      </code>
      .
     </p>
     <p>
      Currently, there are three accepted values for
      <em class="replaceable">
       <code>
        report-type
       </code>
      </em>
      :
     </p>
     <div class="itemizedlist">
      <ul class="itemizedlist" style="list-style-type: circle; ">
       <li class="listitem">
        <p>
         <code class="literal">
          BackupStatus
         </code>
         provides a status report
              on a cluster backup in progress
        </p>
       </li>
       <li class="listitem">
        <p>
         <code class="literal">
          MemoryUsage
         </code>
         displays how much data
              memory and index memory is being used by each data node as
              shown in this example:
        </p>
        <div class="copytoclipboard-wrapper">
         <pre class="programlisting language-ndbmgm"><div class="docs-select-all right" id="sa76168625"><div class="copy-help left">Press ⌘+C to copy</div> <div class="right"><button class="clipboard-btn" title="Copy to Clipboard"><span class="icon-clipboard"></span></button></div></div><code class="language-ndbmgm"><span class="token prompt">ndb_mgm&gt;</span> <span class="token keyword">ALL</span> <span class="token keyword">REPORT</span> <span class="token keyword">MEMORY</span>

<span class="token selector">Node 1:</span> Data usage is 5<span class="token operator">%</span><span class="token punctuation">(</span>177 32K pages of total 3200<span class="token punctuation">)</span>
<span class="token selector">Node 1:</span> Index usage is 0<span class="token operator">%</span><span class="token punctuation">(</span>108 8K pages of total 12832<span class="token punctuation">)</span>
<span class="token selector">Node 2:</span> Data usage is 5<span class="token operator">%</span><span class="token punctuation">(</span>177 32K pages of total 3200<span class="token punctuation">)</span>
<span class="token selector">Node 2:</span> Index usage is 0<span class="token operator">%</span><span class="token punctuation">(</span>108 8K pages of total 12832<span class="token punctuation">)</span></code></pre>
        </div>
        <p>
         This information is also available from the
         <a class="link" href="mysql-cluster-ndbinfo-memoryusage.html" title="25.6.17.46 The ndbinfo memoryusage Table">
          <code class="literal">
           ndbinfo.memoryusage
          </code>
         </a>
         table.
        </p>
       </li>
       <li class="listitem">
        <p>
         <code class="literal">
          EventLog
         </code>
         reports events from the event
              log buffers of one or more data nodes.
        </p>
       </li>
      </ul>
     </div>
     <p>
      <em class="replaceable">
       <code>
        report-type
       </code>
      </em>
      is case-insensitive and
      <span class="quote">
       “
       <span class="quote">
        fuzzy
       </span>
       ”
      </span>
      ; for
      <code class="literal">
       MemoryUsage
      </code>
      , you
          can use
      <code class="literal">
       MEMORY
      </code>
      (as shown in the prior
          example),
      <code class="literal">
       memory
      </code>
      , or even simply
      <code class="literal">
       MEM
      </code>
      (or
      <code class="literal">
       mem
      </code>
      ). You can
          abbreviate
      <code class="literal">
       BackupStatus
      </code>
      in a similar
          fashion.
     </p>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-restart">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-restart">
       <code class="literal">
        <em class="replaceable">
         <code>
          node_id
         </code>
        </em>
        RESTART [-n] [-i] [-a] [-f]
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094465648">
     </a>
     <a class="indexterm" name="idm46045094464160">
     </a>
     <p>
      Restarts the data node identified by
      <em class="replaceable">
       <code>
        node_id
       </code>
      </em>
      (or all data nodes).
     </p>
     <p>
      Using the
      <code class="option">
       -i
      </code>
      option with
      <code class="literal">
       RESTART
      </code>
      causes the data node to perform an
          initial restart; that is, the node's file system is
          deleted and recreated. The effect is the same as that obtained
          from stopping the data node process and then starting it again
          using
      <a class="link" href="mysql-cluster-programs-ndbd.html" title="25.5.1 ndbd — The NDB Cluster Data Node Daemon">
       <span class="command">
        <strong>
         ndbd
        </strong>
       </span>
      </a>
      <a class="link" href="mysql-cluster-programs-ndbd.html#option_ndbd_initial">
       <code class="option">
        --initial
       </code>
      </a>
      from the system shell.
     </p>
     <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
      <div class="admon-title">
       Note
      </div>
      <p>
       Backup files and Disk Data files are not removed when this
            option is used.
      </p>
     </div>
     <p>
      Using the
      <code class="option">
       -n
      </code>
      option causes the data node
          process to be restarted, but the data node is not actually
          brought online until the appropriate
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-start">
       <code class="literal">
        START
       </code>
      </a>
      command is issued.
          The effect of this option is the same as that obtained from
          stopping the data node and then starting it again using
      <a class="link" href="mysql-cluster-programs-ndbd.html" title="25.5.1 ndbd — The NDB Cluster Data Node Daemon">
       <span class="command">
        <strong>
         ndbd
        </strong>
       </span>
      </a>
      <a class="link" href="mysql-cluster-programs-ndbd.html#option_ndbd_nostart">
       <code class="option">
        --nostart
       </code>
      </a>
      or
      <a class="link" href="mysql-cluster-programs-ndbd.html" title="25.5.1 ndbd — The NDB Cluster Data Node Daemon">
       <span class="command">
        <strong>
         ndbd
        </strong>
       </span>
      </a>
      <code class="option">
       -n
      </code>
      from the system
          shell.
     </p>
     <p>
      Using the
      <code class="option">
       -a
      </code>
      causes all current transactions
          relying on this node to be aborted. No GCP check is done when
          the node rejoins the cluster.
     </p>
     <p>
      Normally,
      <code class="literal">
       RESTART
      </code>
      fails if taking the node
          offline would result in an incomplete cluster. The
      <code class="option">
       -f
      </code>
      option forces the node to restart without
          checking for this. If this option is used and the result is an
          incomplete cluster, the entire cluster is restarted.
     </p>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-show">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-show">
       <code class="literal">
        SHOW
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094445840">
     </a>
     <a class="indexterm" name="idm46045094444352">
     </a>
     <p>
      Displays basic information about the cluster and cluster
          nodes. For all nodes, the output includes the node's ID,
          type, and
      <code class="literal">
       NDB
      </code>
      software version. If the node
          is connected, its IP address is also shown; otherwise the
          output shows
      <code class="literal">
       not connected, accepting connect from
       <em class="replaceable">
        <code>
         ip_address
        </code>
       </em>
      </code>
      , with
      <code class="literal">
       any host
      </code>
      used for nodes that are permitted
          to connect from any address.
     </p>
     <p>
      In addition, for data nodes, the output includes
      <code class="literal">
       starting
      </code>
      if the node has not yet started,
          and shows the node group of which the node is a member. If the
          data node is acting as the master node, this is indicated with
          an asterisk (
      <code class="literal">
       *
      </code>
      ).
     </p>
     <p>
      Consider a cluster whose configuration file includes the
          information shown here (possible additional settings are
          omitted for clarity):
     </p>
     <div class="copytoclipboard-wrapper">
      <pre class="programlisting language-ini"><div class="docs-select-all right" id="sa977655"><div class="copy-help left">Press ⌘+C to copy</div> <div class="right"><button class="clipboard-btn" title="Copy to Clipboard"><span class="icon-clipboard"></span></button></div></div><code class="language-ini"><span class="token selector">[ndbd default]</span>
<span class="token constant">DataMemory</span><span class="token attr-value"><span class="token punctuation">=</span> 128G</span>
<span class="token constant">NoOfReplicas</span><span class="token attr-value"><span class="token punctuation">=</span> 2</span>

<span class="token selector">[ndb_mgmd]</span>
<span class="token constant">NodeId</span><span class="token attr-value"><span class="token punctuation">=</span>50</span>
<span class="token constant">HostName</span><span class="token attr-value"><span class="token punctuation">=</span>198.51.100.150</span>

<span class="token selector">[ndbd]</span>
<span class="token constant">NodeId</span><span class="token attr-value"><span class="token punctuation">=</span>5</span>
<span class="token constant">HostName</span><span class="token attr-value"><span class="token punctuation">=</span>198.51.100.10</span>
<span class="token constant">DataDir</span><span class="token attr-value"><span class="token punctuation">=</span>/var/lib/mysql-cluster</span>

<span class="token selector">[ndbd]</span>
<span class="token constant">NodeId</span><span class="token attr-value"><span class="token punctuation">=</span>6</span>
<span class="token constant">HostName</span><span class="token attr-value"><span class="token punctuation">=</span>198.51.100.20</span>
<span class="token constant">DataDir</span><span class="token attr-value"><span class="token punctuation">=</span>/var/lib/mysql-cluster</span>

<span class="token selector">[ndbd]</span>
<span class="token constant">NodeId</span><span class="token attr-value"><span class="token punctuation">=</span>7</span>
<span class="token constant">HostName</span><span class="token attr-value"><span class="token punctuation">=</span>198.51.100.30</span>
<span class="token constant">DataDir</span><span class="token attr-value"><span class="token punctuation">=</span>/var/lib/mysql-cluster</span>

<span class="token selector">[ndbd]</span>
<span class="token constant">NodeId</span><span class="token attr-value"><span class="token punctuation">=</span>8</span>
<span class="token constant">HostName</span><span class="token attr-value"><span class="token punctuation">=</span>198.51.100.40</span>
<span class="token constant">DataDir</span><span class="token attr-value"><span class="token punctuation">=</span>/var/lib/mysql-cluster</span>

<span class="token selector">[mysqld]</span>
<span class="token constant">NodeId</span><span class="token attr-value"><span class="token punctuation">=</span>100</span>
<span class="token constant">HostName</span><span class="token attr-value"><span class="token punctuation">=</span>198.51.100.100</span>

<span class="token selector">[api]</span>
<span class="token constant">NodeId</span><span class="token attr-value"><span class="token punctuation">=</span>101</span></code></pre>
     </div>
     <p>
      After this cluster (including one SQL node) has been started,
      <code class="literal">
       SHOW
      </code>
      displays the following output:
     </p>
     <div class="copytoclipboard-wrapper">
      <pre class="programlisting language-ndbmgm"><div class="docs-select-all right" id="sa72019595"><div class="copy-help left">Press ⌘+C to copy</div> <div class="right"><button class="clipboard-btn" title="Copy to Clipboard"><span class="icon-clipboard"></span></button></div></div><code class="language-ndbmgm"><span class="token prompt">ndb_mgm&gt;</span> <span class="token keyword">SHOW</span>
Connected to Management Server at<span class="token operator">:</span> localhost<span class="token operator">:</span>1186 <span class="token punctuation">(</span>using cleartext<span class="token punctuation">)</span>
Cluster Configuration
<span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">-</span>
<span class="token selector">[ndbd(NDB)]</span>     4 node<span class="token punctuation">(</span>s<span class="token punctuation">)</span>
id<span class="token operator">=</span>5    @198<span class="token punctuation">.</span>51<span class="token punctuation">.</span>100<span class="token punctuation">.</span>10  <span class="token punctuation">(</span>mysql<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0 ndb<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0<span class="token punctuation">,</span> Nodegroup<span class="token operator">:</span> 0<span class="token punctuation">,</span> <span class="token operator">*</span><span class="token punctuation">)</span>
id<span class="token operator">=</span>6    @198<span class="token punctuation">.</span>51<span class="token punctuation">.</span>100<span class="token punctuation">.</span>20  <span class="token punctuation">(</span>mysql<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0 ndb<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0<span class="token punctuation">,</span> Nodegroup<span class="token operator">:</span> 0<span class="token punctuation">)</span>
id<span class="token operator">=</span>7    @198<span class="token punctuation">.</span>51<span class="token punctuation">.</span>100<span class="token punctuation">.</span>30  <span class="token punctuation">(</span>mysql<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0 ndb<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0<span class="token punctuation">,</span> Nodegroup<span class="token operator">:</span> 1<span class="token punctuation">)</span>
id<span class="token operator">=</span>8    @198<span class="token punctuation">.</span>51<span class="token punctuation">.</span>100<span class="token punctuation">.</span>40  <span class="token punctuation">(</span>mysql<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0 ndb<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0<span class="token punctuation">,</span> Nodegroup<span class="token operator">:</span> 1<span class="token punctuation">)</span>

<span class="token selector">[ndb_mgmd(MGM)]</span> 1 node<span class="token punctuation">(</span>s<span class="token punctuation">)</span>
id<span class="token operator">=</span>50   @198<span class="token punctuation">.</span>51<span class="token punctuation">.</span>100<span class="token punctuation">.</span>150  <span class="token punctuation">(</span>mysql<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0 ndb<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0<span class="token punctuation">)</span>

<span class="token selector">[mysqld(API)]</span>   2 node<span class="token punctuation">(</span>s<span class="token punctuation">)</span>
id<span class="token operator">=</span>100  @198<span class="token punctuation">.</span>51<span class="token punctuation">.</span>100<span class="token punctuation">.</span>100  <span class="token punctuation">(</span>mysql<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0 ndb<span class="token operator">-</span>8<span class="token punctuation">.</span>4<span class="token punctuation">.</span>0<span class="token punctuation">)</span>
id<span class="token operator">=</span>101 <span class="token punctuation">(</span>not connected<span class="token punctuation">,</span> accepting connect from any host<span class="token punctuation">)</span></code></pre>
     </div>
     <p>
      The output from this command also indicates when the cluster
          is in single user mode (see the description of the
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-enter-single-user-mode">
       <code class="literal">
        ENTER SINGLE USER MODE
       </code>
      </a>
      command, as well as
      <a class="xref" href="mysql-cluster-single-user-mode.html" title="25.6.6 NDB Cluster Single User Mode">
       Section 25.6.6, “NDB Cluster Single User Mode”
      </a>
      ). It also
          indicates which API or SQL node has exclusive access when this
          mode is in effect.
     </p>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-shutdown">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-shutdown">
       <code class="literal">
        SHUTDOWN
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094427104">
     </a>
     <a class="indexterm" name="idm46045094425616">
     </a>
     <p>
      Shuts down all cluster data nodes and management nodes. To
          exit the management client after this has been done, use
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-quit">
       <code class="literal">
        EXIT
       </code>
      </a>
      or
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-quit">
       <code class="literal">
        QUIT
       </code>
      </a>
      .
     </p>
     <p>
      This command does
      <span class="emphasis">
       <em>
        not
       </em>
      </span>
      shut down any SQL
          nodes or API nodes that are connected to the cluster.
     </p>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-start">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-start">
       <code class="literal">
        <em class="replaceable">
         <code>
          node_id
         </code>
        </em>
        START
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094417968">
     </a>
     <a class="indexterm" name="idm46045094416480">
     </a>
     <p>
      Brings online the data node identified by
      <em class="replaceable">
       <code>
        node_id
       </code>
      </em>
      (or all data nodes).
     </p>
     <p>
      <code class="literal">
       ALL START
      </code>
      works on all data nodes only, and
          does not affect management nodes.
     </p>
     <div class="important" style="margin-left: 0.5in; margin-right: 0.5in;">
      <div class="admon-title">
       Important
      </div>
      <p>
       To use this command to bring a data node online, the data
            node must have been started using
       <a class="link" href="mysql-cluster-programs-ndbd.html#option_ndbd_nostart">
        <code class="option">
         --nostart
        </code>
       </a>
       or
       <code class="option">
        -n
       </code>
       .
      </p>
     </div>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-status">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-status">
       <code class="literal">
        <em class="replaceable">
         <code>
          node_id
         </code>
        </em>
        STATUS
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094408320">
     </a>
     <a class="indexterm" name="idm46045094406832">
     </a>
     <p>
      Displays status information for the data node identified by
      <em class="replaceable">
       <code>
        node_id
       </code>
      </em>
      (or for all data nodes).
     </p>
     <p>
      Possible node status values include
      <code class="literal">
       UNKNOWN
      </code>
      ,
      <code class="literal">
       NO_CONTACT
      </code>
      ,
      <code class="literal">
       NOT_STARTED
      </code>
      ,
      <code class="literal">
       STARTING
      </code>
      ,
      <code class="literal">
       STARTED
      </code>
      ,
      <code class="literal">
       SHUTTING_DOWN
      </code>
      ,
          and
      <code class="literal">
       RESTARTING
      </code>
      .
     </p>
     <p>
      The output from this command also indicates when the cluster
          is in single user mode.
     </p>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-stop">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-stop">
       <code class="literal">
        <em class="replaceable">
         <code>
          node_id
         </code>
        </em>
        STOP [-a] [-f]
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094396240">
     </a>
     <a class="indexterm" name="idm46045094394752">
     </a>
     <p>
      Stops the data or management node identified by
      <em class="replaceable">
       <code>
        node_id
       </code>
      </em>
      .
     </p>
     <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
      <div class="admon-title">
       Note
      </div>
      <p>
       <code class="literal">
        ALL STOP
       </code>
       works to stop all data nodes
            only, and does not affect management nodes.
      </p>
     </div>
     <p>
      A node affected by this command disconnects from the cluster,
          and its associated
      <a class="link" href="mysql-cluster-programs-ndbd.html" title="25.5.1 ndbd — The NDB Cluster Data Node Daemon">
       <span class="command">
        <strong>
         ndbd
        </strong>
       </span>
      </a>
      or
      <a class="link" href="mysql-cluster-programs-ndb-mgmd.html" title="25.5.4 ndb_mgmd — The NDB Cluster Management Server Daemon">
       <span class="command">
        <strong>
         ndb_mgmd
        </strong>
       </span>
      </a>
      process terminates.
     </p>
     <p>
      The
      <code class="option">
       -a
      </code>
      option causes the node to be stopped
          immediately, without waiting for the completion of any pending
          transactions.
     </p>
     <p>
      Normally,
      <code class="literal">
       STOP
      </code>
      fails if the result would
          cause an incomplete cluster. The
      <code class="option">
       -f
      </code>
      option
          forces the node to shut down without checking for this. If
          this option is used and the result is an incomplete cluster,
          the cluster immediately shuts down.
     </p>
     <div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;">
      <div class="admon-title">
       Warning
      </div>
      <p>
       Use of the
       <code class="option">
        -a
       </code>
       option also disables the
            safety check otherwise performed when
       <code class="literal">
        STOP
       </code>
       is invoked to insure that stopping
            the node does not cause an incomplete cluster. In other
            words, you should exercise extreme care when using the
       <code class="option">
        -a
       </code>
       option with the
       <code class="literal">
        STOP
       </code>
       command, due to the fact that this option makes it possible
            for the cluster to undergo a forced shutdown because it no
            longer has a complete copy of all data stored in
       <a class="link" href="mysql-cluster.html" title="Chapter 25 MySQL NDB Cluster 8.4">
        <code class="literal">
         NDB
        </code>
       </a>
       .
      </p>
     </div>
    </li>
    <li class="listitem">
     <p>
      <a name="ndbclient-tls-info">
      </a>
      <a class="link" href="mysql-cluster-mgm-client-commands.html#ndbclient-tls-info">
       <code class="literal">
        TLS INFO
       </code>
      </a>
     </p>
     <a class="indexterm" name="idm46045094378320">
     </a>
     <a class="indexterm" name="idm46045094376832">
     </a>
     <p>
      Displays cluster TLS information such as whether the current
          connection is using TLS, TLS certificates currently known to
          the management node, and the management node's counts of
          total connections, connections upgraded to TLS, and
          authorization failures. Sample output is shown here:
     </p>
     <div class="copytoclipboard-wrapper">
      <pre class="programlisting language-terminal"><div class="docs-select-all right" id="sa56830135"><div class="copy-help left">Press ⌘+C to copy</div> <div class="right"><button class="clipboard-btn" title="Copy to Clipboard"><span class="icon-clipboard"></span></button></div></div><code class="language-terminal">ndb_mgm&gt; TLS INFO

Session ID<span class="token punctuation">:</span>          1
Peer address<span class="token punctuation">:</span>        127<span class="token punctuation">.</span>0<span class="token punctuation">.</span>0<span class="token punctuation">.</span>1
Certificate name<span class="token punctuation">:</span>    NDB Management Node Jun 2023
Certificate serial<span class="token punctuation">:</span>  B5<span class="token punctuation">:</span>23<span class="token punctuation">:</span>8F<span class="token punctuation">:</span>D1<span class="token punctuation">:</span>11<span class="token punctuation">:</span>85<span class="token punctuation">:</span>E5<span class="token punctuation">:</span>93<span class="token punctuation">:</span>ED
Certificate expires<span class="token punctuation">:</span> 23-Nov-2023

Server statistics since restart
Total accepted connections<span class="token punctuation">:</span>        6
Total connections upgraded to TLS<span class="token punctuation">:</span> 2
Current connections<span class="token punctuation">:</span>               3
Current connections using TLS<span class="token punctuation">:</span>     2
Authorization failures<span class="token punctuation">:</span>            0

ndb_mgm&gt;</code></pre>
     </div>
     <p>
      For more information, see
      <a class="xref" href="mysql-cluster-tls.html" title="25.6.15 TLS Link Encryption for NDB Cluster">
       Section 25.6.15, “TLS Link Encryption for NDB Cluster”
      </a>
      .
     </p>
    </li>
   </ul>
  </div>
  <p>
   <b>
    Additional commands.
   </b>
   A number of other commands available in the
   <a class="link" href="mysql-cluster-programs-ndb-mgm.html" title="25.5.5 ndb_mgm — The NDB Cluster Management Client">
    <span class="command">
     <strong>
      ndb_mgm
     </strong>
    </span>
   </a>
   client are described elsewhere, as
        shown in the following list:
  </p>
  <div class="itemizedlist">
   <ul class="itemizedlist" style="list-style-type: disc; ">
    <li class="listitem">
     <p>
      <a class="link" href="mysql-cluster-backup-using-management-client.html" title="25.6.8.2 Using The NDB Cluster Management Client to Create a Backup">
       <code class="literal">
        START BACKUP
       </code>
      </a>
      is used to
          perform an online backup in the
      <a class="link" href="mysql-cluster-programs-ndb-mgm.html" title="25.5.5 ndb_mgm — The NDB Cluster Management Client">
       <span class="command">
        <strong>
         ndb_mgm
        </strong>
       </span>
      </a>
      client; the
      <a class="link" href="mysql-cluster-backup-using-management-client.html#ndbclient-abort-backup" title="Cancelling backups">
       <code class="literal">
        ABORT BACKUP
       </code>
      </a>
      command is used to cancel a backup already in progress. For
          more information, see
      <a class="xref" href="mysql-cluster-backup.html" title="25.6.8 Online Backup of NDB Cluster">
       Section 25.6.8, “Online Backup of NDB Cluster”
      </a>
      .
     </p>
    </li>
    <li class="listitem">
     <p>
      The
      <a class="link" href="mysql-cluster-logging-management-commands.html" title="25.6.3.1 NDB Cluster Logging Management Commands">
       <code class="literal">
        CLUSTERLOG
       </code>
      </a>
      command is
          used to perform various logging functions. See
      <a class="xref" href="mysql-cluster-event-reports.html" title="25.6.3 Event Reports Generated in NDB Cluster">
       Section 25.6.3, “Event Reports Generated in NDB Cluster”
      </a>
      , for more
          information and examples.
      <code class="literal">
       NODELOG DEBUG
      </code>
      activates or deactivates debug printouts in node logs, as
          described previously in this section.
     </p>
    </li>
    <li class="listitem">
     <p>
      For testing and diagnostics work, the client supports a
      <a class="ulink" href="/doc/ndb-internals/en/dump-commands.html" target="_top">
       <code class="literal">
        DUMP
       </code>
      </a>
      command which can be
          used to execute internal commands on the cluster. It should
          never be used in a production setting unless directed to do so
          by MySQL Support. For more information, see
      <a class="ulink" href="/doc/ndb-internals/en/dump-commands.html" target="_top">
       NDB Cluster Management Client DUMP Commands
      </a>
      .
     </p>
    </li>
   </ul>
  </div>
 </div>
 <br/>
</div>
