OCA 03 - Creating an Oracle Database

7/29/2019 OCA 03 - Creating an Oracle Database

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03 - Creating an Oracle Database

By Muhammad Asghar Khan

Reference: OCA Oracle Database 11g - Admin I Exam Guide by John Watson


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Agenda

http://asghars.blogspot.com

Create a Database by Using the DBCA Understanding the Instance, Database, and the Data

Dictionary

EXERCISE 3-1: Use the DBCA to Create a Database

Scripts and Other Files Created by the DBCA

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Create a Database by Using the DBCA


Understanding the Instance, Database, and theData Dictionary

An Oracle server is an instance and a database

The instance is memory structures and processes, in

your RAM and on your CPU(s) and is defined by aninstance parameter file

The database is files on disk

Creating an instance is nothing more than building

the memory structures and starting the processes All parameters, either specified by the parameter file

or implicit, have defaults, except for one: theparameter DB_NAME

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Creating a database is done by the instance

The data dictionary describes all the logical andphysical structures in the database, including all thesegments that store user data

The data dictionary itself is created by running a setof SQL scripts that exist in theORACLE_HOME/rdbms/admin directory

EXERCISE 3-1: Use the DBCA to Create a Database

1. Invoke the dbca2. On the DBCA Welcome dialog box, click Next

3. Select the Create A Database radio button, and clickNext

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4. Select the Custom Database radio button, as thiswill present all possible options. Click Next

5. In the Database Identification dialog box, enter a

global database name, and a System Identifier (a

SID), which will be used as the instance name

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6. The Management Options dialog box has a checkbox for configuring the database with Enterprise

Manager. Select this. Then there are radio buttons

for either Grid Control or Database Control. The

Grid Control radio button will be grayed out if theDBCA does not detect a Grid Control agent running

on the machine. Select Database Control.

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7. The Database Credentials dialog box prompts forpasswords for four users in the database: SYS (who

owns the data dictionary), SYSTEM (used for most

DBA work), DBSNMP (used for external monitoring),

and SYSMAN (used by Enterprise Manager). Selectthe radio button for Use The Same Password For All

Accounts. Enter oracle

as the password,

twice, and click Next

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8. Select Storage Types as File System, then select theUse Common Locations for All Database Files

9. In the Recovery Configuration dialog box, accept the

default configuration for the flash recovery area and

do not enable archiving. Click Next

10. In the Database Content dialog box, deselect all

options except Enterprise Manager Repository. The

others are not needed for this database and will

make the creation take much longer

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11. Click the Standard Database Components button,and deselect these as well. Dont worry about a

warning that the XML DB is used by other

components. Click Next

12. The Initialization Parameters dialog box has fourtabs. Leave everything on default, but look at all the

tabs

13. The Database Storage dialog box shows, via a

navigation tree on the left, the files that will becreated. Navigate around this, and see the names

and sizes of the files

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14. In the Creation Options dialog box, select the checkboxes for Create Database and Generate Database

Creation Scripts. Note the path for the scripts; it will

be ORACLE_BASE/admin/ocp11g/scripts. Click

Finish15. When the DBCA completes, it will present the

dialog box shown in the illustration that follows.

Take note of all the information given, in particular

the URL given for database control

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Scripts generated will be in the directoryORACLE_BASE/admin/DB_NAME/scripts

The instance parameter file, named init.ora

There are about 300 parameters, but the file generatedby the DBCA sets only a few

The Database Creation Shell Script is the file the DBCAexecutes to launch the database creation process

The CreateDB.sql script consists of CREATE DATABASECommand

The other SQL scripts called by ocp11g.sql to completethe database creation will depend on the optionschosen when going through the DBCA

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CreateDBfiles.sql

It creates a small tablespace USERS

CreateDBCatalog.sql

It runs a set of scripts in the $ORACLE_HOME/rdbms/admindirectory that construct views on the data dictionary and

create many PL/SQL packages emRepository.sql

This runs the script to create the objects needed byEnterprise Manager Database Control

postDBCreation.sql This generates a server parameter file from the init.ora file,

unlocks the DBSNMP and SYSMAN accounts used by EM,and runs the EM configuration Assistant (emca) to configureDatabase Control for the new database

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OCA 03 - Creating an Oracle Database

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