title: ID generation strategy supported by Oracle 12c
body: <p>Which ID generation strategies are supported by Oracle 12c?</p>
  
  <p><strong>And which ID generation strategy is the best to use / with best performance?</strong> </p>
  
  <p>I was reading post about ID generation: <a href="http://sadalage.com/blog/2017/06/12/id-generation/" rel="nofollow noreferrer">http://sadalage.com/blog/2017/06/12/id-generation/</a></p>
  
  <p>and wanted to check if is true that IDENTITY Id generation strategy has truly drawbacks in terms of round trips to DB as described or optimizer can prevent this?</p>