Today, I’ll show you how we can create a Database without Database Configuration Assistant (DBCA). We’re going to create the database manually, using CREATE DATABASE statement. Sometimes, we are not able to use GUI in order to create a database. For this, we should know syntax of database creation from SQL*Plus. To create database manually, follow below steps:    

1. Firstly, export Environment Variables. To export EV automatically for every session, do below changes to /home/oracle/.bashrc file:

 export ORACLE_SID=kamran

export ORACLE_HOME=/home/oracle/oracle/product/10.2.0/db_1

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$ORACLE_HOME/lib

 

 

2. Create parameter file and modify it by setting minimum required parameters:

*.db_name=kamran

*.db_block_size=8192

*.sga_target=1677721600

*.undo_management=’AUTO’

*.control_files = (‘/home/oracle/oracle/product/10.2.0/control01.ctl’)

*.user_dump_dest=’/home/oracle/oracle/product/10.2.0/udump’

*.background_dump_dest=’/home/oracle/oracle/product/10.2.0/bdump’

*.core_dump_dest=’/home/oracle/oracle/product/10.2.0/cdump’

After creation of this parameter file, create below folders in /home/oracle/oracle/product/10.2.0/ directory. Three of them are dump folders (needed for trace files and alert.log file). We’re going to keep Control Files and DataFiles in oradata folder.

–          oradata

–          udump

–          bdump

–          cdump

 

 3. Create Server parameter file (SPFILE) using this parameter file and STARTUP the instance in NOMOUNT mode.

 CREATE SPFILE FROM PFILE=’/home/oracle/oracle/product/10.2.0/init.ora’;

STARTUP NOMOUNT

  

Now our instance started, SGA allocated and background processes started

 

4. To create a new database, use the CREATE DATABASE statement. As a result, below files will be created:

–          Redo Log files

–          system.dbf and sysaux.dbf (files for SYSTEM tablespace)

–          undo01.dbf file (for UNDO tablespace)

–          temp_tbs.dbf file (for TEMPORARY tablespace)

–          users.dbf (for DEFAULT PERMANENT tablespace)

 

//######## Database Creation Code ####### 

CREATE DATABASE kamran

    USER SYS IDENTIFIED BY kamran

    USER SYSTEM IDENTIFIED BY kamran

LOGFILE GROUP 1 (‘/home/oracle/oracle/product/10.2.0/oradata/redo01.log’) SIZE 50 m,

    GROUP 2 (‘/home/oracle/oracle/product/10.2.0/oradata/redo02.log’) SIZE 50 m,

    GROUP 3 (‘/home/oracle/oracle/product/10.2.0/oradata/redo03.log’) SIZE 50 m

    MAXLOGFILES 5

    MAXLOGMEMBERS 5

    MAXLOGHISTORY 1

   MAXDATAFILES 100

   MAXINSTANCES 1

   CHARACTER SET us7ascii

   NATIONAL CHARACTER SET al16utf16

   DATAFILE ‘/home/oracle/oracle/product/10.2.0/oradata/system01.dbf’ SIZE 325 m REUSE EXTENT MANAGEMENT LOCAL

   SYSAUX DATAFILE ‘/home/oracle/oracle/product/10.2.0/oradata/sysaux.dbf’ SIZE 400 m REUSE

    DEFAULT TABLESPACE tbs_1 DATAFILE ‘/home/oracle/oracle/product/10.2.0/oradata/users.dbf’ SIZE 200m REUSE AUTOEXTEND ON MAXSIZE UNLIMITED

    DEFAULT TEMPORARY TABLESPACE tempts1 TEMPFILE ‘/home/oracle/oracle/product/10.2.0/oradata/temp_tbs.dbf’ SIZE 20m REUSE

    undo TABLESPACE undotbs DATAFILE ‘/home/oracle/oracle/product/10.2.0/oradata/undo01.dbf’ SIZE 200m REUSE AUTOEXTEND ON MAXSIZE UNLIMITED

 

 

 5. Run the scripts necessary to build views, synonyms, and PL/SQL packages

CONNECT / AS SYSDBA

SQL>@$ORACLE_HOME/rdbms/admin/catalog.sql

SQL>@$ORACLE_HOME/rdbms/admin/catproc.sql

 

6. Shutdown the instance and startup the database. Your database is ready for use!