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Oracle Database 21c : Create Database2022/02/16
 
Create Database instance.
[1] Login as user [oracle] and input a command [dbca] like follows.

[2] Select [Create Database] and go to next.
[3] On this example, select [Advanced Configuration] and go to next.
[4] This example selects [General Purpose ***] and go to next.
[5] Set Grobal Database name and SID like follows. Set any name you like.
[6] This example goes to next with keeping default.
[7] This is the recovery option section. Set it if you need. This example goes to next with keeping default.
[8] This is the listener settings section. Specify it you added.
[9] This is the Oracle Database Vault settings section. Set it if you need. This example goes to next with keeping default.
[10] Configure memory settings. After setting, go to next tab. This example goes to next with keeping default.
[11] Specify max processes. This example goes to next with keeping default.
[12] Set Character setting. This example goes to next with keeping default.
[13] Select a connection mode. If your server does not have many clients, Select Dedicated server mode. If your server has many clients, Select Shared server mode.
[14] Configure Oracle Enterprise Manager's port. This example goes next with keeping default.
[15] Set Oracle users' password. Set different password for each user by security reason.
[16] This is the Database option section. Set it if you need. This example goes to next with keeping default.
[17] Confirm selections. If that's OK, Click [Finish] button.
[18] Database creation task starts.
[19] After finishing creation, Close the window.
[20] Add Database [SID] to the environment variables and test to connect to the database.
[oracle@dlp ~]$
vi /etc/oratab
# change like follows

db01:/usr/oracle/database:
Y
[oracle@dlp ~]$
vi ~/.bash_profile
# add your SID to the end

export ORACLE_SID=db01
[oracle@dlp ~]$
source ~/.bash_profile

[oracle@dlp ~]$
sqlplus /nolog 


SQL*Plus: Release 21.0.0.0.0 - Production on Tue Feb 15 21:35:33 2022
Version 21.3.0.0.0

Copyright (c) 1982, 2021, Oracle.  All rights reserved.

SQL> connect / as sysdba 
Connected.
SQL> select instance_name, host_name, version, startup_time from v$instance; 

INSTANCE_NAME
----------------
HOST_NAME
----------------------------------------------------------------
VERSION           STARTUP_T
----------------- ---------
db01
dlp.srv.world
21.0.0.0.0        15-FEB-22

SQL> exit 
Disconnected from Oracle Database 21c Enterprise Edition Release 21.0.0.0.0 - Production
Version 21.3.0.0.0
[21] If you use Enterprise Manager from other Hosts and also Firewalld is running, allow service port.
[root@dlp ~]#
firewall-cmd --add-port=5500/tcp

success
[root@dlp ~]#
firewall-cmd --runtime-to-permanent

success
[22] For Enterprise Manager, access to [https://(servers hostname or IP address):5500/em], then login form is shown. Login with a user in Oracle Database.
[23] This is the Enterprise Manager admin console.
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