title: Why is it a vacuum not needed with Mysql compared to the PostgreSQL?
body: <p>I am more familiar with PostgreSQL than MySQL. Have encountered wraparound Id failure once with the PostgreSQL db and then understood the importance of vacuuming in the db. Actually, that was such a massive overhead work to deal with(and it was with an old version 7.4.3 which is updated a few months back to have the autovacuum). When comparing MySQL with PostgreSQL, assume that MySQL does not have to deal with such overheads like vacuum in PostgreSQL. Is this assumption right? </p>
  
  <p>Also why is it a vacuum not needed with MySQL Dbs compared to PostgreSQL? Is there any other optimization alternatives similar to vacuum exist for MySQL dbs?  </p>