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     <h4 class="title">
      <a name="performance-schema-cond-instances-table">
      </a>
      29.12.3.1 The cond_instances Table
     </h4>
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  <a class="indexterm" name="idm46045073599312">
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  <p>
   The
   <a class="link" href="performance-schema-cond-instances-table.html" title="29.12.3.1 The cond_instances Table">
    <code class="literal">
     cond_instances
    </code>
   </a>
   table lists
          all the conditions seen by the Performance Schema while the
          server executes. A condition is a synchronization mechanism
          used in the code to signal that a specific event has happened,
          so that a thread waiting for this condition can resume work.
  </p>
  <p>
   When a thread is waiting for something to happen, the
          condition name is an indication of what the thread is waiting
          for, but there is no immediate way to tell which other thread,
          or threads, causes the condition to happen.
  </p>
  <p>
   The
   <a class="link" href="performance-schema-cond-instances-table.html" title="29.12.3.1 The cond_instances Table">
    <code class="literal">
     cond_instances
    </code>
   </a>
   table has
          these columns:
  </p>
  <div class="itemizedlist">
   <ul class="itemizedlist" style="list-style-type: disc; ">
    <li class="listitem">
     <p>
      <code class="literal">
       NAME
      </code>
     </p>
     <p>
      The instrument name associated with the condition.
     </p>
    </li>
    <li class="listitem">
     <p>
      <code class="literal">
       OBJECT_INSTANCE_BEGIN
      </code>
     </p>
     <p>
      The address in memory of the instrumented condition.
     </p>
    </li>
   </ul>
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  <p>
   The
   <a class="link" href="performance-schema-cond-instances-table.html" title="29.12.3.1 The cond_instances Table">
    <code class="literal">
     cond_instances
    </code>
   </a>
   table has
          these indexes:
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   <ul class="itemizedlist" style="list-style-type: disc; ">
    <li class="listitem">
     <p>
      Primary key on (
      <code class="literal">
       OBJECT_INSTANCE_BEGIN
      </code>
      )
     </p>
    </li>
    <li class="listitem">
     <p>
      Index on (
      <code class="literal">
       NAME
      </code>
      )
     </p>
    </li>
   </ul>
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  <p>
   <a class="link" href="truncate-table.html" title="15.1.37 TRUNCATE TABLE Statement">
    <code class="literal">
     TRUNCATE TABLE
    </code>
   </a>
   is not permitted
          for the
   <a class="link" href="performance-schema-cond-instances-table.html" title="29.12.3.1 The cond_instances Table">
    <code class="literal">
     cond_instances
    </code>
   </a>
   table.
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