title: CACHE of SQL in oracle
body: <p>How oracle CACHE a Query (SQL), Query execution contains the following steps.
  1. PARSE
  2. Execute
  3. Fetch</p>
  
  <p>in First step oracle checks if query exists in CACHE (Shared Pool) or not (It will be exists if query is identical and based on LRU), if exists then PARSING will be skipped and execution will start.
  So to make query performance intensive we must use bind variables and use the identical sql queries.</p>
  
  <p>But in Parsing oracle verifies authentication also (User Access), if multiple users are using the same query, how oracle skip/use parsing?</p>