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Creating a Database in Oracle 9i


Every wondered how the Oracle database is structured? To learn more about the structure and how one would create an Oracle 9i database using the latest features read this article.

Author Info:
By: Ben Shepherd
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April 11, 2003
TABLE OF CONTENTS:
  1. · Creating a Database in Oracle 9i
  2. · How Data is Stored
  3. · Create a Database

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Creating a Database in Oracle 9i - Create a Database
(Page 3 of 3 )

There are two ways that you can create a database in Oracle 9i. One way is to use the Oracle Database Configuration Assistant. Using the Oracle Database Configuration Assistant makes sure that the new database is optimized with Oracle 9i’s latest features. Simply read the instruction and follow the prompts. The other way to create a database is to do it manually. This will now be demonstrated.

Create a suitable directory structure for the new database. Once this is done, copy the init.ora file into a new file named init{SID}.ora into new directory.

Now you have created a parameter file, you’ll need to declare an Oracle SID name. Keep the SID consistent with the parameter filename. The command to do this action will depend on the platform you have the DBMS installed. If you are using Windows, simply type,

Set ORACLE_SID = {SID}

Alternatively, on the a unix platform, the DBA must type,

Export ORACLE_SID = {SID}

Use SQL*Plus under / as sysdba and set the database to nomount mode.

So, if we wish to override the default spfile to start the new instance in nomount mode then type,

Startup nomount pfile = ‘<directory>\init{SID}.ora’

Now we are about to create the database. When creating a new database, write the code into an sql file so that your have a copy of the database features as well as the ability to fix any mistakes in the create database command. Here is the code,

CREATE DATABASE ShepIT
Maxinstances   1
Maxloghistory  1
Maxlogfiles  10
Maxlogmembers 15
Maxdatafiles  100
Datafile ‘<directory>\datafile_01.dbf’
size 300M reuse autoextend on next 15M maxsize unlimited
character set WE8MSWIN1252
national character set AL16UFT16
logfile 
group 1 (‘<directory>\redo_01.log’) size 75M
 group 2 (‘<directory>\redo_02.log’) size 75M
 group 3 (‘<directory>\redo_03.log’) size 75M
default temporary tablespace TEMP
tempfile ‘<directory>\temp_01.dbf’
 extent management local uniform size 1M
undo tablespace UNDO_TS datafile ‘<directory>\datafile_01.dbf’
 size 125M reuse autoextend on next 15M maxsize unlimited;

Oracle, should respond by saying that the database is created. Once this is done you are ready to load scripts that are needed to support your Oracle products by typing the following commands

@<directory>\catalog.sql
@<directory>\catproc.sql
@<directory>\catexp.sql

Ok, the database is configured. Change the SYSTEM and SYS passwords, to ensure better security for your database.


DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware.

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