How to Configure 12c Enterprise Manager Database Express

  • Architecture for Oracle Enterprise Manager Database Express:

EM_DB_X

  • Check and configure DISPATCHERS parameter:
SQL> show parameter dispatchers

NAME TYPE VALUE
------------- --------- --------------------------------
dispatchers string (PROTOCOL=TCP) (SERVICE=cdb2XDB)
  • Use DBMS_XDB_CONFIG to set up HTTP or/and HTTPS ports

For HTTPS:

SQL> exec DBMS_XDB_CONFIG.sethttpsport(5500);

or for HTTP:

SQL> exec DBMS_XDB_CONFIG.sethttpport(5501);
  • To check the HTTPs or HTTP ports by:
SQL> select dbms_xdb_config.gethttpsport from dual;

GETHTTPSPORT
------------
5500

SQL>select dbms_xdb_config.gethttpport from dual;

GETHTTPPORT
-----------
5501
  •  Connect to Enterprise Manager Database Express  Console:

https://hostname:5500/em

or

http://hostname:5501/em

OEM Logon

 

Automating 12c Database Startup and Shutdown on Oracle Linux 7

PURPOSE

Oracle recommends to configure the system to automatically start Oracle Database when the system starts, and to automatically shut it down when the system shuts down.

Environment:
Operating System:     Oracle Linux 7
Oracle Database:        Oracle 12.1.0.2

SOLUTION

  • Check and configure  /etc/oratab appropriately
    If you want dbstart to auto-start a single-instance database that uses an ASM server that is auto-started by CRS (this is the default behavior  for an ASM cluster), you must change the database’s ORATAB entry to use  a third field of “W” and the ASM’s ORATAB entry to use a third field of “N”.
  • Change directory to /etc/init.d, and create a file “dbora” with below contents. The Oracle doc has got typo for this script part  “runuser $HOST -l $ORACLE  $0 $1 ORA_DB”, which will cause failure.
$ cat dbora
#! /bin/sh -x
#
# Change the value of ORACLE_HOME to specify the correct Oracle home
# directory for your installation.
ORACLE_HOME=/u01/app/oracle/product/12.1.0/dbhome_1
#
# Change the value of ORACLE to the login name of the
# oracle owner at your site.
#
ORACLE=oracle
PATH=${PATH}:$ORACLE_HOME/bin
HOST=`hostname`
PLATFORM=`uname`
export ORACLE_HOME PATH
#
if [ ! "$2" = "ORA_DB" ] ; then
#runuser $HOST -l $ORACLE  $0 $1 ORA_DB
    runuser  -l $ORACLE  $0 $1 ORA_DB
if [ "$PLATFORM" = "Linux" ] ; then
touch /var/lock/subsys/dbora
fi
exit
fi
#
case $1 in
'start')
$ORACLE_HOME/bin/dbstart $ORACLE_HOME &
;;
'stop')
$ORACLE_HOME/bin/dbshut $ORACLE_HOME &
;;
*)
echo "usage: $0 {start|stop}"
exit
;;
esac
#
exit
  • Change file “dbaora” with right group name and permission.
# chgrp dba dbora
# chmod 750 dbora
  •  Create symbolic links to the dbora script in the appropriate run-level script directories:
Platform Symbolic Links Commands
Oracle Solaris
# ln -s /etc/init.d/dbora /etc/rc0.d/K01dbora
# ln -s /etc/init.d/dbora /etc/rc3.d/S99dbora
Linux
# ln -s /etc/init.d/dbora /etc/rc.d/rc0.d/K01dbora
# ln -s /etc/init.d/dbora /etc/rc.d/rc3.d/S99dbora
# ln -s /etc/init.d/dbora /etc/rc.d/rc5.d/S99dbora
IBM AIX on POWER Systems (64-Bit)
# ln -s /etc/dbora /etc/rc.d/rc2.d/S99dbora
# ln -s /etc/dbora /etc/rc.d/rc0.d/K01dbora

Check the logs

  • /var/log/messages
  • $ORACLE_HOME/listener.log
  • $OACLE_HOME/shutdown.log
  • $ORACLE_HOME/startup.log