title: SQL_NO_CACHE for Postgresql?
body: <p>Is there a postgresql equivalent for the MySQL keyword <code>SQL_NO_CACHE</code> (or the SQL Server <code>dbcc drop clean buffers</code>) i.e. which you can simply include in a SQL statement or as part of a script?</p>
  
  <p><strong>UPDATE</strong>: this question </p>
  
  <p><a href="https://stackoverflow.com/questions/1216660/see-and-clear-postgres-caches-buffers">See and clear Postgres caches/buffers?</a></p>
  
  <p>seems to say that the answer is "no", although it is now two years old. Are there any relevant changes in postgresql 9.0?</p>