title: Oracle Database Express Edition (XE) memory parameter invalid or not specified when setting memory_max_target parameter
body: <p>I am using Oracle db 18c XE 64 bit. I am trying to enable Automatic Memory Management. In order to do so, I have to set memory_max_target parameter first then restart the database then set memory_target parameter according to the documentation <a href="https://docs.oracle.com/en/database/oracle/oracle-database/18/admin/managing-memory.html#GUID-0E201F66-D280-472A-AD80-20AB8F7E9C01" rel="nofollow noreferrer">https://docs.oracle.com/en/database/oracle/oracle-database/18/admin/managing-memory.html#GUID-0E201F66-D280-472A-AD80-20AB8F7E9C01</a>. I started cmd then opened sqlplus using <code>sqlplus / as sysdba</code> command then issued <code>alter system set memory_max_target=2000M</code>. The system altered successfully. The next step was to set memory_target. I shudown the db using <code>SHUTDOWN</code> command. then exited sqlplus to reopen it using <code>sqlplus /nolog</code> then <code>connect / as sysdba</code> to see error &quot;</p>
  <pre><code>ORA-56752: Oracle Database Express Edition (XE) memory parameter invalid or not
  specified
  ORA-01078: failure in processing system parameters
  </code></pre>
  <p>&quot;
  Why am I seeing this error?</p>