title: how to find which database file (.dat) is used for a given table in derbydb?
body: <p>in derbydb under seg0/ folder there are many database files with .dat extension, like:</p>
  
  <pre><code>c1c1ba61.dat
  c1c1ba71.dat
  c1c1ba80.dat
  c1c1ba91.dat
  c1c1baa1.dat
  c1c1bab1.dat
  c1c1bac0.dat
  c1c1bad1.dat
  c1c1bae0.dat
  </code></pre>
  
  <p>how to find which file is used for which table in that DB?</p>