title: Postgresql,multiXact member wraparound protections are now enabled
body: <p>I'm using postgresql 9.4.8 . In pg_log, i found a statement like, </p>
  
  <blockquote>
    <p>LOG:  MultiXact member wraparound protections are now enabled.</p>
  </blockquote>
  
  <p>I can't find what this means. I didn't see these kind of statements in  postgresql 9.2.1.  </p>
  
  <p>Thanks in advance</p>