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     <h3 class="title">
      <a name="optimizer-trace-system-variable">
      </a>
      10.15.8 The optimizer_trace System Variable
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  <p>
   The optimizer_trace system variable has these on/off switches:
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     <p>
      <code class="literal">
       enabled
      </code>
      : Enables (
      <code class="literal">
       ON
      </code>
      ) or
          disables (
      <code class="literal">
       OFF
      </code>
      ) tracing
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    </li>
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     <p>
      <code class="literal">
       one_line
      </code>
      : If set to
      <code class="literal">
       ON
      </code>
      ,
          the trace contains no whitespace, thus conserving space. This
          renders the trace difficult to read for humans, still usable
          by JSON parsers, since they ignore whitespace.
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