t (in our case,
            transaction, logging, locking, and the memory pool)
            are described by one or more regions.  The regions contain all of the
            state information that needs to be shared among threads and/or
            processes using the environment.
        </p>
          <p>
            Regions may be backed by the file system, by heap memory, or by
            system shared memory.
        </p>
          <div class="sect3" lang="en" xml:lang="en">
            <div class="ti