title: Why isn't RDBMS Partition Tolerant in CAP Theorem and why is it Available?
body: <p>Two points I don’t understand about RDBMS being CA in CAP Theorem :</p>
  
  <p>1) It says RDBMS is <strong>not</strong> <strong>Partition Tolerant</strong> but how is RDBMS <strong>any less</strong> Partition Tolerant than other technologies like MongoDB or Cassandra? Is there a RDBMS setup where we give up CA to make it AP or CP?</p>
  
  <p>2) How is it CAP-Available? Is it through master-slave setup? As in when the master dies, slave takes over writes?</p>
  
  <p>I’m a novice at DB architecture and CAP theorem so please bear with me.</p>