v.Ass. Mag. Katrin Seyr.
   </p></div><p>
   This chapter gives an overview of the internal structure of the
   backend of <span class="productname">PostgreSQL</span>.  After having
   read the following sections you should have an idea of how a query
   is processed.  This chapter is intended to help the reader
   understand the general sequence of operations that occur within the
   backend from the point at which a query is received, to the point
   at which the results are returned to the client.
  </p>