 DB_CREATE     |  /* Create the environment if it does not exist */ 
      DB_INIT_LOCK  |  /* Initialize the locking subsystem */
      DB_INIT_LOG   |  /* Initialize the logging subsystem */
      DB_INIT_TXN   |  /* Initialize the transactional subsystem. This
                        * also turns on logging. */
      DB_INIT_MPOOL |  /* Initialize the memory pool (in-memory cache) */
      <strong class="userinput"><code>DB_PRIVATE    |  /* Region files are not backed by the filesystem. 
                