Oracle 21c dbca

dbca create database !!!!


Update Kernel Parameters (as root)
Open /etc/sysctl.conf and set the following values. These are calculated to allow 
Oracle to use up to 16GB of your 18GB for shared memory (SGA):

kernel.shmmax: 17179869184 (16GB in bytes)

kernel.shmall: 4194304 (16GB / 4096 page size)

Bash

# Apply these commands as root or with sudo
echo "kernel.shmmax = 17179869184" >> /etc/sysctl.conf
echo "kernel.shmall = 4194304" >> /etc/sysctl.conf
echo "kernel.shmmni = 4096" >> /etc/sysctl.conf

# Load the changes
sysctl -p



[root@oragrid ~]# ssh -X oracle@192.168.1.106
oracle@192.168.1.106's password:
Activate the web console with: systemctl enable --now cockpit.socket

Last login: Tue Jan  6 10:59:47 2026 from 192.168.1.106
[oracle@oragrid ~]$ /u01/app/oracle/product/21.0.0/dbhome1/bin/dbca -CreateDatabase -silent \
> -gdbName v16mpc -sid v16mpc -sysPassword sys \
> -systemPassword sys -createAsContainerDatabase true \
> -numberofPDBs 1 -pdbname v16mpcpdb -pdbAdminUserName pdba \
> -pdbAdminPassword password -emConfiguration LOCAL \
> -dbsnmpPassword dbsnmp123 -storageType ASM -datafiledestination +DATA \
> -recoveryAreaDestination +DATA -databaseType MULTIPURPOSE -responseFile NO_VALUE \
> -totalmemory 26096 -characterset AL32UTF8 -nationalcharacterset AL16UTF16 \
> -automaticmemorymanagement FALSE \
> -templateName /u01/app/oracle/product/21.0.0/dbhome1/assistants/dbca/templates/General_Purpose.dbc
[WARNING] [DBT-11209] Current available memory is less than the required available memory (26,096MB) for creating the database.
   CAUSE: Following nodes do not have required available memory :
 Node:oragrid           Available memory:13.6285GB (1.429052E7KB)


****************


reduce the sga !!!

/u01/app/oracle/product/21.0.0/dbhome1/bin/dbca -CreateDatabase -silent \
> -gdbName v16mpc -sid v16mpc -sysPassword sys \
> -systemPassword sys -createAsContainerDatabase true \
> -numberofPDBs 1 -pdbname v16mpcpdb -pdbAdminUserName pdba \
> -pdbAdminPassword password -emConfiguration LOCAL \
> -dbsnmpPassword dbsnmp123 -storageType ASM -datafiledestination +DATA \
> -recoveryAreaDestination +DATA -databaseType MULTIPURPOSE -responseFile NO_VALUE \
> -totalmemory 26096 -characterset AL32UTF8 -nationalcharacterset AL16UTF16 \
> -automaticmemorymanagement FALSE \
> -templateName /u01/app/oracle/product/19.0.0/dbhome1/assistants/dbca/templates/General_Purpose.dbc



[oracle@oragrid ~]$ /u01/app/oracle/product/21.0.0/dbhome1/bin/dbca -CreateDatabase -silent -gdbName v16mpc -sid v16mpc -sysPassword sys -systemPassword sys -createAsContainerDatabase true -numberofPDBs 1 -pdbname v16mpcpdb -pdbAdminUserName pdba -pdbAdminPassword password -emConfiguration LOCAL -dbsnmpPassword dbsnmp123 -storageType ASM -datafiledestination +DATA -recoveryAreaDestination +DATA -databaseType MULTIPURPOSE -responseFile NO_VALUE -totalmemory 4096 -characterset AL32UTF8 -nationalcharacterset AL16UTF16 -automaticmemorymanagement FALSE -templateName /u01/app/oracle/product/21.0.0/dbhome1/assistants/dbca/templates/General_Purpose.dbc


[WARNING] [DBT-06208] The 'SYS' password entered does not conform to the Oracle recommended standards.
   CAUSE:
a. Oracle recommends that the password entered should be at least 8 characters in length, contain at least 1 uppercase character, 1 lower case character and 1 digit [0-9].
b.The password entered is a keyword that Oracle does not recommend to be used as password
   ACTION: Specify a strong password. If required refer Oracle documentation for guidelines.
[WARNING] [DBT-06208] The 'SYSTEM' password entered does not conform to the Oracle recommended standards.
   CAUSE:
a. Oracle recommends that the password entered should be at least 8 characters in length, contain at least 1 uppercase character, 1 lower case character and 1 digit [0-9].
b.The password entered is a keyword that Oracle does not recommend to be used as password
   ACTION: Specify a strong password. If required refer Oracle documentation for guidelines.
[WARNING] [DBT-06208] The 'PDBADMIN' password entered does not conform to the Oracle recommended standards.
   CAUSE:
a. Oracle recommends that the password entered should be at least 8 characters in length, contain at least 1 uppercase character, 1 lower case character and 1 digit [0-9].
b.The password entered is a keyword that Oracle does not recommend to be used as password
   ACTION: Specify a strong password. If required refer Oracle documentation for guidelines.
Prepare for db operation
7% complete
Registering database with Oracle Restart
11% complete
Copying database files
33% complete
Creating and starting Oracle instance
35% complete
38% complete
45% complete
48% complete
Completing Database Creation
53% complete
55% complete
56% complete
Creating Pluggable Databases
60% complete
78% complete
Executing Post Configuration Actions
100% complete
Database creation complete. For details check the logfiles at:
 /u01/app/oracle/cfgtoollogs/dbca/v16mpc.
Data
a.



[oracle@oragrid trace]$ sqlplus / as sysdba

SQL*Plus: Release 21.0.0.0.0 - Production on Tue Jan 6 12:35:09 2026
Version 21.19.0.0.0

Copyright (c) 1982, 2022, Oracle.  All rights reserved.


Connected to:
Oracle Database 21c Enterprise Edition Release 21.0.0.0.0 - Production
Version 21.19.0.0.0

SQL> show parameter pfile

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
spfile                               string      +DATA/V16MPC/PARAMETERFILE/spf
                                                 ile.377.1221826957
SQL>



                                               ile.377.1221826957
SQL> show pdbs

    CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
         2 PDB$SEED                       READ ONLY  NO
         3 V16MPCPDB                      READ WRITE NO
SQL>



[oracle@oragrid oracle]$ cd homes/
[oracle@oragrid homes]$ pwd
/u01/app/oracle/homes

[oracle@oragrid homes]$ ls -ltr
total 0
drwxr-x--- 14 oracle oinstall 172 Dec 24  2024 OraDB21Home1


[oracle@oragrid homes]$ cd OraDB21Home1/
[oracle@oragrid OraDB21Home1]$ ls -ltr
total 0



drwxr-x--- 4 oracle oinstall 30 Dec 24  2024 rdbms
drwxr-x--- 5 oracle oinstall 43 Dec 24  2024 network
drwxr-x--- 3 oracle oinstall 19 Dec 24  2024 mgw
drwxr-x--- 2 oracle oinstall  6 Dec 24  2024 install
drwxr-x--- 3 oracle oinstall 19 Dec 24  2024 hs
drwxr-x--- 3 oracle oinstall 19 Dec 24  2024 drdaas
drwxr-x--- 3 oracle oinstall 18 Dec 24  2024 assistants
drwxr-x--T 4 oracle oinstall 33 Dec 24  2024 log
drwxr-x--- 3 oracle oinstall 22 Dec 24  2024 cfgtoollogs
drwxr-x--- 2 oracle oinstall  6 Dec 30  2024 dbs
drwxr-x--- 3 oracle oinstall 22 Jan  6 11:58 sqlpatch
drwxr-xr-x 5 oracle asmadmin 49 Jan  6 12:24 admin
[oracle@oragrid OraDB21Home1]$


drwxr-x--- 4 oracle oinstall 30 Dec 24  2024 rdbms
drwxr-x--- 5 oracle oinstall 43 Dec 24  2024 network
drwxr-x--- 3 oracle oinstall 19 Dec 24  2024 mgw
drwxr-x--- 2 oracle oinstall  6 Dec 24  2024 install
drwxr-x--- 3 oracle oinstall 19 Dec 24  2024 hs
drwxr-x--- 3 oracle oinstall 19 Dec 24  2024 drdaas
drwxr-x--- 3 oracle oinstall 18 Dec 24  2024 assistants
drwxr-x--T 4 oracle oinstall 33 Dec 24  2024 log
drwxr-x--- 3 oracle oinstall 22 Dec 24  2024 cfgtoollogs
drwxr-x--- 2 oracle oinstall  6 Dec 30  2024 dbs
drwxr-x--- 3 oracle oinstall 22 Jan  6 11:58 sqlpatch
drwxr-xr-x 5 oracle asmadmin 49 Jan  6 12:24 admin
[oracle@oragrid OraDB21Home1]$

[oracle@oragrid OraDB21Home1]$ pwd
/u01/app/oracle/homes/OraDB21Home1

[oracle@oragrid OraDB21Home1]$