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      10.3.7 Verifying Index Usage
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  <p>
   Always check whether all your queries really use the indexes
        that you have created in the tables. Use the
   <a class="link" href="explain.html" title="15.8.2 EXPLAIN Statement">
    <code class="literal">
     EXPLAIN
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   statement, as described
        in
   <a class="xref" href="using-explain.html" title="10.8.1 Optimizing Queries with EXPLAIN">
    Section 10.8.1, “Optimizing Queries with EXPLAIN”
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   .
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