|Oracle® Database Administrator's Guide
11g Release 2 (11.2)
Part Number E17120-05
DATBASE SQL statement is a more manual approach to creating a database. One advantage of using this statement over using DBCA is that you can create databases from within scripts.
If you use the
CREATE DATABASE statement, you must complete additional actions before you have an operational database. These actions include building views on the data dictionary tables and installing standard PL/SQL packages. You perform these actions by running the supplied scripts.
If you have existing scripts for creating your database, consider editing those scripts to take advantage of new Oracle Database features.
The instructions in this section apply to single-instance installations only. Refer to the Oracle Real Application Clusters (Oracle RAC) installation guide for your platform for instructions for creating an Oracle RAC database.
Note:Single-instance does not mean that only one Oracle instance can reside on a single host computer. In fact, multiple Oracle instances (and their associated databases) can run on a single host computer. A single-instance database is a database that is accessed by only one Oracle instance, as opposed to an Oracle RAC database, which is accessed concurrently by multiple Oracle instances on multiple nodes. See Oracle Real Application Clusters Administration and Deployment Guide for more information on Oracle RAC.
Complete the following steps to create a database with the
DATABASE statement. The examples create a database named
Tip:If you are using Oracle Automatic Storage Management (Oracle ASM) to manage your disk storage, you must start the Oracle ASM instance and configure your disk groups before performing these steps. For information about Automatic Storage Management, see Oracle Automatic Storage Management Administrator's Guide.
ORACLE_SID is used to distinguish this instance from other Oracle Database instances that you may create later and run concurrently on the same host computer. The maximum number of characters for
ORACLE_SID is 12, and only letters and numeric digits are permitted. On some platforms, the SID is case-sensitive.
Note:It is common practice to set the SID to be equal to the database name. The maximum number of characters for the database name is eight. For more information, see the discussion of the
DB_NAMEinitialization parameter in Oracle Database Reference.
The following example for UNIX and Linux operating systems sets the SID for the instance that you will connect to in Step 6: Connect to the Instance:
Bourne, Bash, or Korn shell:
ORACLE_SID=mynewdb export ORACLE_SID
setenv ORACLE_SID mynewdb
The following example sets the SID for the Windows operating system:
See Also:Oracle Database Concepts for background information about the Oracle instance
Depending on your platform, before you can start SQL*Plus (as required in Step 6: Connect to the Instance), you may have to set environment variables, or at least verify that they are set properly.
For example, on most platforms,
ORACLE_HOME must be set. In addition, it is advisable to set the
PATH variable to include the ORACLE_HOME/bin directory. On the UNIX and Linux platforms, you must set these environment variables manually. On the Windows platform, OUI automatically assigns values to
ORACLE_SID in the Windows registry. If you did not create a database upon installation, OUI does not set
ORACLE_SID in the registry, and you will have to set the
ORACLE_SID environment variable when you create your database later.
You must be authenticated and granted appropriate system privileges in order to create a database. You can be authenticated as an administrator with the required privileges in the following ways:
With a password file
With operating system authentication
In this step, you decide on an authentication method.
To be authenticated with a password file, create the password file as described in "Creating and Maintaining a Password File". To be authenticated with operating system authentication, ensure that you log in to the host computer with a user account that is a member of the appropriate operating system user group. On the UNIX and Linux platforms, for example, this is typically the
dba user group. On the Windows platform, the user installing the Oracle software is automatically placed in the required user group.
"Database Administrator Authentication" for information about password files and operating system authentication
When an Oracle instance starts, it reads an initialization parameter file. This file can be a text file, which can be created and modified with a text editor, or a binary file, which is created and dynamically modified by the database. The binary file, which is preferred, is called a server parameter file. In this step, you create a text initialization parameter file. In a later step, you create a server parameter file from the text file.
One way to create the text initialization parameter file is to edit the sample presented in "Sample Initialization Parameter File".
If you create the initialization parameter file manually, ensure that it contains at least the parameters listed in Table 2-2. All other parameters not listed have default values.
Table 2-2 Recommended Minimum Initialization Parameters
Database identifier. Must correspond to the value used in the
Strongly recommended. If not provided, the database instance creates one control file in the same location as the initialization parameter file. Providing this parameter enables you to multiplex control files. See "Creating Initial Control Files" for more information.
Sets the total amount of memory used by the instance and enables automatic memory management. You can choose other initialization parameters instead of this one for more manual control of memory usage. See "Configuring Memory Manually".
For convenience, store your initialization parameter file in the Oracle Database default location, using the default file name. Then when you start your database, it will not be necessary to specify the
PFILE clause of the
STARTUP command, because Oracle Database automatically looks in the default location for the initialization parameter file.
For more information about initialization parameters and the initialization parameter file, including the default name and location of the initialization parameter file for your platform, see "About Initialization Parameters and Initialization Parameter Files".
On the Windows platform, before you can connect to an instance, you must manually create it if it does not already exist. The
ORADIM command creates an Oracle instance by creating a new Windows service.
To create an instance:
Enter the following command at a Windows command prompt:
oradim -NEW -SID sid -STARTMODE MANUAL -PFILE pfile
sid is the desired SID (for example
pfile is the full path to the text initialization parameter file. This command creates the instance but does not start it.
Caution:Do not set the -
AUTOat this point, because this causes the new instance to start and attempt to mount the database, which does not exist yet. You can change this parameter to
AUTO, if desired, in Step 14.
See the section "Using ORADIM to Administer an Oracle Database Instance" in Oracle Database Platform Guide for Microsoft Windows for more information on the
Start SQL*Plus and connect to your Oracle Database instance with the
SYSDBA system privilege.
To authenticate with a password file, enter the following commands, and then enter the
SYS password when prompted:
$ sqlplus /nolog SQL> CONNECT SYS AS SYSDBA
To authenticate with operating system authentication, enter the following commands:
$ sqlplus /nolog SQL> CONNECT / AS SYSDBA
SQL*Plus outputs the following message:
Connected to an idle instance.
Note:SQL*Plus may output a message similar to the following:
Connected to: Oracle Database 11g Enterprise Edition Release 126.96.36.199.0 - Production With the Partitioning, OLAP and Data Mining options
If so, this means that the instance is already started. You may have connected to the wrong instance. Exit SQL*Plus with the
EXIT command, check that
ORACLE_SID is set properly, and repeat this step.
The server parameter file enables you to change initialization parameters with the
SYSTEM command and persist the changes across a database shutdown and startup. You create the server parameter file from your edited text initialization file.
The following SQL*Plus command reads the text initialization parameter file (PFILE) with the default name from the default location, creates a server parameter file (SPFILE) from the text initialization parameter file, and writes the SPFILE to the default location with the default SPFILE name.
CREATE SPFILE FROM PFILE;
You can also supply the file name and path for both the PFILE and SPFILE if you are not using default names and locations.
Tip:The database must be restarted before the server parameter file takes effect.
Note:Although creating a server parameter file is optional at this point, it is recommended. If you do not create a server parameter file, the instance continues to read the text initialization parameter file whenever it starts.
Important—If you are using Oracle Managed Files and your initialization parameter file does not contain the
CONTROL_FILES parameter, you must create a server parameter file now so the database can save the names and location of the control files that it creates during the
DATABASE statement. See "Specifying Oracle Managed Files at Database Creation" for more information.
Oracle Database SQL Language Reference for more information on the
Start an instance without mounting a database. Typically, you do this only during database creation or while performing maintenance on the database. Use the
STARTUP command with the
NOMOUNT clause. In this example, because the initialization parameter file or server parameter file is stored in the default location, you are not required to specify the
At this point, the instance memory is allocated and its processes are started. The database itself does not yet exist.
Oracle Database Concepts for an overview of the Oracle instance.
Chapter 3, "Starting Up and Shutting Down", to learn how to use the
The following statement creates database
mynewdb. This database name must agree with the
DB_NAME parameter in the initialization parameter file. This example assumes the following:
The initialization parameter file specifies the number and location of control files with the
CREATE DATABASE mynewdb USER SYS IDENTIFIED BY sys_password USER SYSTEM IDENTIFIED BY system_password LOGFILE GROUP 1 ('/u01/logs/my/redo01a.log','/u02/logs/my/redo01b.log') SIZE 100M BLOCKSIZE 512, GROUP 2 ('/u01/logs/my/redo02a.log','/u02/logs/my/redo02b.log') SIZE 100M BLOCKSIZE 512, GROUP 3 ('/u01/logs/my/redo03a.log','/u02/logs/my/redo03b.log') SIZE 100M BLOCKSIZE 512 MAXLOGFILES 5 MAXLOGMEMBERS 5 MAXLOGHISTORY 1 MAXDATAFILES 100 CHARACTER SET US7ASCII NATIONAL CHARACTER SET AL16UTF16 EXTENT MANAGEMENT LOCAL DATAFILE '/u01/app/oracle/oradata/mynewdb/system01.dbf' SIZE 325M REUSE SYSAUX DATAFILE '/u01/app/oracle/oradata/mynewdb/sysaux01.dbf' SIZE 325M REUSE DEFAULT TABLESPACE users DATAFILE '/u01/app/oracle/oradata/mynewdb/users01.dbf' SIZE 500M REUSE AUTOEXTEND ON MAXSIZE UNLIMITED DEFAULT TEMPORARY TABLESPACE tempts1 TEMPFILE '/u01/app/oracle/oradata/mynewdb/temp01.dbf' SIZE 20M REUSE UNDO TABLESPACE undotbs DATAFILE '/u01/app/oracle/oradata/mynewdb/undotbs01.dbf' SIZE 200M REUSE AUTOEXTEND ON MAXSIZE UNLIMITED;
A database is created with the following characteristics:
The database is named
mynewdb. Its global database name is
mynewdb.us.example.com, where the domain portion (
us.example.com) is taken from the initialization file. See "Determining the Global Database Name".
Three control files are created as specified by the
CONTROL_FILES initialization parameter, which was set before database creation in the initialization parameter file. See "Sample Initialization Parameter File" and "Specifying Control Files".
The passwords for user accounts
SYSTEM are set to the values that you specified. Beginning with Release 11g, the passwords are case-sensitive. The two clauses that specify the passwords for
SYSTEM are not mandatory in this release of Oracle Database. However, if you specify either clause, you must specify both clauses. For further information about the use of these clauses, see "Protecting Your Database: Specifying Passwords for Users SYS and SYSTEM".
The new database has three redo log file groups, each with two members, as specified in the
MAXLOGHISTORY define limits for the redo log. See "Choosing the Number of Redo Log Files". The block size for the redo logs is set to 512 bytes, the same size as physical sectors on disk. The
BLOCKSIZE clause is optional if block size is to be the same as physical sector size (the default). Typical sector size and thus typical block size is 512. Permissible values for
BLOCKSIZE are 512, 1024, and 4096. For newer disks with a 4K sector size, optionally specify
BLOCKSIZE as 4096. See "Planning the Block Size of Redo Log Files" for more information.
MAXDATAFILES specifies the maximum number of datafiles that can be open in the database. This number affects the initial sizing of the control file.
Note:You can set several limits during database creation. Some of these limits are limited by and affected by operating system limits. For example, if you set
MAXDATAFILES, Oracle Database allocates enough space in the control file to store
MAXDATAFILESfilenames, even if the database has only one datafile initially. However, because the maximum control file size is limited and operating system dependent, you might not be able to set all
CREATE DATABASEparameters at their theoretical maximums.
For more information about setting limits during database creation, see the Oracle Database SQL Language Reference and your operating system–specific Oracle documentation.
US7ASCII character set is used to store data in this database.
AL16UTF16 character set is specified as the
NATIONAL CHARACTER SET, used to store data in columns specifically defined as
SYSTEM tablespace, consisting of the operating system file
/u01/app/oracle/oradata/mynewdb/system01.dbf is created as specified by the
DATAFILE clause. If a file with that name already exists, it is overwritten.
SYSTEM tablespace is created as a locally managed tablespace. See "Creating a Locally Managed SYSTEM Tablespace".
SYSAUX tablespace is created, consisting of the operating system file
/u01/app/oracle/oradata/mynewdb/sysaux01.dbf as specified in the
SYSAUX DATAFILE clause. See "About the SYSAUX Tablespace".
TABLESPACE clause creates and names a default permanent tablespace for this database.
DEFAULT TEMPORARY TABLESPACE clause creates and names a default temporary tablespace for this database. See "Creating a Default Temporary Tablespace".
UNDO TABLESPACE clause creates and names an undo tablespace that is used to store undo data for this database if you have specified
UNDO_MANAGEMENT=AUTO in the initialization parameter file. If you omit this parameter, it defaults to
AUTO. See "Using Automatic Undo Management: Creating an Undo Tablespace".
Redo log files will not initially be archived, because the
ARCHIVELOG clause is not specified in this
DATABASE statement. This is customary during database creation. You can later use an
ALTER DATABASE statement to switch to
ARCHIVELOG mode. The initialization parameters in the initialization parameter file for
mynewdb relating to archiving are
LOG_ARCHIVE_FORMAT. See Chapter 13, "Managing Archived Redo Logs".
Ensure that all directories used in the
DATABASE statement exist. The
DATABASE statement does not create directories.
If you are not using Oracle Managed Files, every tablespace clause must include a
If database creation fails, you can look at the alert log to determine the reason for the failure and to determine corrective actions. See "Viewing the Alert Log". If you receive an error message that contains a process number, examine the trace file for that process. Look for the trace file that contains the process number in the trace file name. See "Finding Trace Files" for more information.
If you want to resubmit the
DATABASE statement after a failure, you must first shut down the instance and delete any files created by the previous
This example illustrates creating a database with Oracle Managed Files, which enables you to use a much simpler
DATABASE statement. To use Oracle Managed Files, the initialization parameter
DB_CREATE_FILE_DEST must be set. This parameter defines the base directory for the various database files that the database creates and automatically names. The following statement is an example of setting this parameter in the initialization parameter file:
With Oracle Managed Files and the following
DATABASE statement, the database creates the
SYSAUX tablespaces, creates the additional tablespaces specified in the statement, and chooses default sizes and properties for all datafiles, control files, and redo log files. Note that these properties and the other default database properties set by this method may not be suitable for your production environment, so it is recommended that you examine the resulting configuration and modify it if necessary.
CREATE DATABASE mynewdb USER SYS IDENTIFIED BY sys_password USER SYSTEM IDENTIFIED BY system_password EXTENT MANAGEMENT LOCAL DEFAULT TEMPORARY TABLESPACE temp UNDO TABLESPACE undotbs1 DEFAULT TABLESPACE users;
DATABASEstatement fails, and if you did not complete Step 7, ensure that there is not a pre-existing server parameter file (SPFILE) for this instance that is setting initialization parameters in an unexpected way. For example, an SPFILE contains a setting for the complete path to all control files, and the
DATABASEstatement fails if those control files do not exist. Ensure that you shut down and restart the instance (with
NOMOUNT) after removing an unwanted SPFILE. See "Managing Initialization Parameters Using a Server Parameter File" for more information.
Oracle Database SQL Language Reference for more information about specifying the clauses and parameter values for the
CREATE DATABASE statement
To make the database functional, you need to create additional tablespaces for your application data. The following sample script creates some additional tablespaces:
CREATE TABLESPACE apps_tbs LOGGING DATAFILE '/u01/app/oracle/oradata/mynewdb/apps01.dbf' SIZE 500M REUSE AUTOEXTEND ON NEXT 1280K MAXSIZE UNLIMITED EXTENT MANAGEMENT LOCAL; -- create a tablespace for indexes, separate from user tablespace (optional) CREATE TABLESPACE indx_tbs LOGGING DATAFILE '/u01/app/oracle/oradata/mynewdb/indx01.dbf' SIZE 100M REUSE AUTOEXTEND ON NEXT 1280K MAXSIZE UNLIMITED EXTENT MANAGEMENT LOCAL;
For information about creating tablespaces, see Chapter 14, "Managing Tablespaces".
Run the scripts necessary to build data dictionary views, synonyms, and PL/SQL packages, and to support proper functioning of SQL*Plus:
@?/rdbms/admin/catalog.sql @?/rdbms/admin/catproc.sql @?/sqlplus/admin/pupbld.sql EXIT
The at-sign (
@) is shorthand for the command that runs a SQL*Plus script. The question mark (
?) is a SQL*Plus variable indicating the Oracle home directory. The following table contains descriptions of the scripts:
||Creates the views of the data dictionary tables, the dynamic performance views, and public synonyms for many of the views. Grants
||Runs all scripts required for or used with PL/SQL.|
||Required for SQL*Plus. Enables SQL*Plus to disable commands by user.|
You may want to run other scripts. The scripts that you run are determined by the features and options you choose to use or install. Many of the scripts available to you are described in the Oracle Database Reference.
If you plan to install other Oracle products to work with this database, see the installation instructions for those products. Some products require you to create additional data dictionary tables. Usually, command files are provided to create and load these tables into the database data dictionary.
See your Oracle documentation for the specific products that you plan to install for installation and administration instructions.
Take a full backup of the database to ensure that you have a complete set of files from which to recover if a media failure occurs. For information on backing up a database, see Oracle Database Backup and Recovery User's Guide.
You might want to configure the Oracle instance to start automatically when its host computer restarts. See your operating system documentation for instructions. For example, on Windows, use the following command to configure the database service to start the instance upon computer restart:
ORADIM -EDIT -SID sid -STARTMODE AUTO -SRVCSTART SYSTEM [-SPFILE]
You must use the
-SPFILE argument if you want the instance to read an SPFILE upon automatic restart.
The section "Using ORADIM to Administer an Oracle Database Instance" in Oracle Database Platform Guide for Microsoft Windows for more information on the