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Step 2 - Starting DBCA
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Learn Oracle - Starting DBCA
To launch DBCA on the Windows operating system use the following procedure:
1. Log onto your computer as a member of the administrative group that is
authorized to install Oracle software and create and run the database.
2. To launch DBCA on a Windows operating system select the following:
Start > Programs > Oracle - home_name > Configuration and Migration Tools >
Database Configuration Assistant
To launch the DBCA on a UNIX, or as another method on a Windows operating
system, enter the following at a command prompt:
dbca which is typically found in $ORACLE_HOME/bin. The Welcome page appears.
3. Click Next to continue.
Using DBCA to Create a Database
Select Create a Database on the DBCA Operations page to begin a wizard that
enables Oracle DBA to configure and create a database. During the interview, Oracle DBA are asked
for your input on the following:
Learn oracle - Database Templates
Learn oracle - Database Identification
Learn oracle - Management Options
Learn oracle - Database Credentials
Learn oracle - Storage Options
Learn oracle - Database File Locations
Learn oracle - Recovery Configuration
Learn oracle - Database Content
Learn oracle - Initialization Parameters
Learn oracle - Database Storage
Learn oracle - Creation Options
Note that most pages of the wizard provide a default setting that Oracle DBA can accept. To
accept all the default parameters, Oracle DBA can click Finish at any step.
Database Templates
This page enables Oracle DBA to select the type of database Oracle DBA want to create. By default,
Oracle Corporation ships pre-defined templates. There are templates for Data
Warehouse, General Purpose, and Transaction Processing databases. The templates
contain settings optimized for workload. Click Show Details to see the configuration
for each type of database. Choose the template suited to the type of workload your
database will support. If Oracle DBA are not sure, select the default General Purpose template.
For more complex environments, Oracle DBA may want to select the Custom Database
option. This will result in a more extensive interview and it will take longer to create
your database, since a database creation script must be run.
Database Identification
Enter the Global Database Name, in the form database_name.domain_name and SID
(Oracle system identifier). The SID defaults to the database name and uniquely
identifies the instance that runs the database.
Management Options
Use this page to set up your database so it can be managed with Oracle Enterprise
Manager, which provides web-based management tools for individual databases, as
well as central management tools for managing your entire Oracle environment.
To use Enterprise Manager, check Configure the Database with Enterprise Manager.
If the Oracle Management Agent has been installed on your host computer, then you
are given the option of selecting central management by selecting Use Grid Control
for Database Management. If you select this type of management, you must also
indicate which management service to use in the drop-down menu.
Otherwise, select Use Database Control for Database Management to manage your
database locally. If you choose this option, you can additionally Enable Email
Notifications, for Oracle to email you alerts regarding potential problems, and Enable
Daily Backup. Click Help for more information about these options.
Database Credentials
In this page, you specify the passwords for the administrative accounts such as SYS
and SYSTEM. To use the same password for all accounts, specify Use the Same
Password for All Accounts and enter the password.
Otherwise, specify Use Different Passwords and specify passwords individually.
Storage Options
Specify the type of storage mechanism you would like your database to use. For more
information, refer to "Installation Choices" earlier in this chapter.
Database File Locations
In this page, Oracle DBA specify the Oracle home and directory path in which to install the
Oracle software. Choose one of the following:
Use Database File Locations from Template---Selecting this option instructs the
DBCA to use the directory information as specified in the template. Even if Oracle DBA
choose this option, Oracle DBA will have an opportunity later to make modifications to
database filenames and locations.
Use Common Location for All Database Files---This option requires Oracle DBA to
specify a new directory for the Oracle home. All the database files will be created
in this location. Even if Oracle DBA choose this option, Oracle DBA will have an opportunity later
to make modifications to database filenames and locations.
Use Oracle-Managed Files---Select this option to eliminate the need for you, the
DBA, to directly manage operating system files comprising an Oracle database.
You specify default location called a database area for all your files. Oracle
thereafter automatically creates and deletes files in this location as required. You
also have the option to create multiple copies of your redo and online log files by
Selecting this option enables you to delegate the complete management of
database files to the database. Oracle DBA no longer need to specify the filenames,
location, or their sizes.
Recovery Configuration
When Oracle DBA create a new database, it is important to configure the database so you can
recover your data in the event of a system failure. Use this page to specify a flash
recovery area and to enable archiving.
To specify a backup and recovery area, choose Specify Flash Recovery Area and
specify its directory location and size. You can use variables to identify some standard
locations. To review or add additional locations, click File Location Variables at the
bottom of the page.
By checking Enable Archiving, you can enable archiving. This includes archiving
database redo logs, which can be used to recover a database. Selecting this option is
the same as enabling Archive Log Mode in Oracle Enterprise Manager or running the
database in ARCHIVELOG mode. You can accept the default archive mode settings or
change them by selecting Edit Archive Mode Parameters
Oracle recommends you select Enable Archiving. Selecting this option provides better
protection for your database in the case of software or hardware failure. If Oracle DBA do not
select this option now, Oracle DBA can set up archive log mode later.
Database Content
In the Sample Schemas property page, check Sample Schemas if Oracle DBA want to include
the Sample Schemas (EXAMPLE) tablespace in your database. The Sample Schemas
provide a common platform for examples. Oracle books and educational materials
contain examples based upon the Sample Schemas. Oracle recommends they be
included in your database.
In the Custom Scripts property page, you can specify one or more SQL scripts to run
after your database is created. This is useful for performing post-installation tasks,
such as loading custom schemas. To specify scripts, check Run the following scripts.
Note that if you choose to run scripts after installation, your scripts must include a
connect string that identifies the database. Click Help for more information.
Otherwise to run no script, accept the default No scripts to run.
Initialization Parameters
The links on this page provide access to pages that enable you change default
initialization parameter settings. These parameters fall into the following categories:
Memory
Sizing
Character Sets
Connection Mode
Memory Use this page to set the initialization parameters that control how the database
manages its memory usage. Oracle DBA can choose from one of two approaches to memory
management:
Typical---requires little configuration, and allocates memory as a percentage of total
overall physical system memory. To use this method, select Typical and enter a
percentage value. Click Show Memory Distribution to see how much memory the
Assistant assigns to the System Global Area (SGA) and the Program Global Area
Custom---requires more configuration, but gives Oracle DBA more control over how the
database uses system memory. This option is meant for more experienced database
administrators. Oracle DBA can directly specify memory sizes for the SGA and PGA and their
sub-structures, such as the shared pool and buffer cache.
To use this method, click Custom. To allocate specific amounts of memory to SGA and
PGA, select Automatic. To customize how the SGA memory is distributed among the
SGA memory substructures, select Manual and enter specific values for each SGA
component. For a complete description of these memory areas, click Help.
Sizing In this property page, Oracle DBA specify the smallest block size and the maximum
number of operating system user processes that can simultaneously connect to the
database.
To specify block size, enter the size in bytes or accept the default. Oracle database data
is stored in these blocks. One data block corresponds to a specific number of bytes of
physical space on disk. While using pre-defined templates, this field is not enabled
since the database will be created with the default block size of 8KB. But while using
the custom option, you can change block size. Selecting a block size other than the
default 8 KB value requires advanced knowledge and should only be done when
absolutely required.
To specify maximum number of processes that can simultaneously connect to the
database, enter the number or accept the default. The value should be 6 or greater. This
value should allow for all background processes, such as locks and parallel execution
processes. The default value for this parameter is 150 which is good enough for many
environments.
Character Sets Use this page to define the character sets used by your database.
Character sets are the encoding schemes used to display characters on your computer
screen. Choosing a character set determines what languages can be represented in the
database.
For Database Character Set, select from one of the following options:
Use the Default--Select this option if Oracle DBA need to support only the language
currently used by the operating system for all your database users and your
database applications.
Use Unicode (AL32UTF8)--Select this option if you need to support multiple
languages for your database users and your database applications.
Choose from the list of character sets--Select this option if Oracle DBA want the Oracle
Database to use a character set other than the default character set used by the
operating system.
The national character set is an alternate character set that enables you to store
Unicode characters in a database that does not have a Unicode database character set.
Another reason for choosing a national character set is that programming in the
national character set might be easier. Select the National Character Set from the
drop-down menu or accept the default.
information such as day and month abbreviations, default sorting sequence for
character data, and writing direction (left or right). Select the default language from
the drop-down menu or accept the default.
The Default Date Format determines the convention for displaying the hour, day,
month, and year. For example in the United Kingdom, the date format is
DD-MM-YYYY. Select the format from the drop-down menu or accept the default.
Connection Mode Use this page to select the database mode. Oracle DBA can run the database in
dedicated server mode or shared server mode.
In Dedicated Server Mode, there is a dedicated server process for each user process.
Select this option when the number of total clients is expected to be small, or when
database clients will make persistent, long-running requests to the database.
In Shared Server Mode, several client connections share a database-allocated pool of
resources. Use this mode when a large number of users need to connect to the
database. It is also useful when database memory is limited and for better
performance, since you can have more client connections to the database than in
dedicated server mode with the same memory. If Oracle DBA choose shared server mode, you
must also indicate the number of server processes you want to create when an instance
is started up. For more information about setting this parameter, click Help.
Database Storage
A tree listing shows you the storage structure of your database (control files, datafiles,
redo log groups, and so forth). If you are not satisfied with the storage structure or
parameters you can make changes. You can create a new object with Create and delete
existing objects with Delete.
Note that if Oracle DBA selected one of the preconfigured templates for a database, you cannot
add or remove control files, datafiles or rollback segments.
Creation Options
Oracle DBA have the option of creating your database at this time, or saving the database
definition as a template to use at another time, or both.
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