Too msuch wait time for APEX page rendering

Question

Oracle XE 11gR2 64-bit
RHEL 64-bit
Using EPG
Logged in as sys/sysdba
==================
This is based on the thread at Too much time on network wait!
Referring back to the thread above which seems to have gone 'cold' and for some strange reason the second page of that thread no longer appears/exists.
But on that second page someone mentioned the solution below (with the idea that the EPG was causing the issue of pages rendering slow. Page render fine using Glassfish in another environment).
exec dbms_xdb.cfg_update( updatexml( dbms_xdb.cfg_get(), '/xdbconfig/sysconfig/call-timeout/text()', '300', 'xmlns="http://xmlns.oracle.com/xdb/xdbconfig.xsd"'));
I'd like to try this solution out. However, it fails to even run for me so I was hoping for some clarification.
Connected to:
Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production
SQL> exec dbms_xdb.cfg_update( updatexml( dbms_xdb.cfg_get(), '/xdbconfig/sysconfig/call-timeout/text()', '300', 'xmlns="http://xmlns.oracle.com/xdb/xdbconfig.xsd"'));
BEGIN dbms_xdb.cfg_update( updatexml( dbms_xdb.cfg_get(), '/xdbconfig/sysconfig/call-timeout/text()', '300', 'xmlns="http://xmlns.oracle.com/xdb/xdbconfig.xsd"')); END;
ERROR at line 1:
ORA-06550: line 1, column 28:
PLS-00201: identifier 'UPDATEXML' must be declared
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
SQL>
Thank you.

Answer 1

the idea that the EPG was causing the issue of pages rendering slow. Page render fine using Glassfish in another environment). Probably the value of the SHARED_SERVERS parameter needs to be increased.
See this article for more info:
http://ora-00001.blogspot.no/2008/04/adventures-with-apex-part-one-boosting.html
- Morten
http://ora-00001.blogspot.com