Oracle database is a relational database management system widely used in enterprise-level data management. The management of users and table spaces is a very important part of the daily work of database administrators. Good user and table space management can improve the performance and security of the database. This article will introduce the management skills of users and table spaces in Oracle database, and attach specific code examples.
In the Oracle database, you can create a user through the CREATE USER
command. The example is as follows:
CREATE USER new_user IDENTIFIED BY password;
Use the GRANT
command to authorize corresponding permissions to the user. The example is as follows:
GRANT SELECT, INSERT, UPDATE, DELETE ON table_name TO user_name;
If you need to change the user password, you can use the ALTER USER
command, the example is as follows:
ALTER USER user_name IDENTIFIED BY new_password;
Be careful when deleting the user , please ensure that users do not own important data and permissions. The operation of deleting a user is as follows:
DROP USER user_name CASCADE;
In Oracle database, you can use CREATE TABLESPACE
Command to create a table space, the example is as follows:
CREATE TABLESPACE new_tablespace DATAFILE 'path_to_datafile' SIZE 100M;
To specify the default table space for the user, you can use the ALTER USER
command, the example is as follows :
ALTER USER user_name DEFAULT TABLESPACE new_tablespace;
You can check the table space usage through the DBA_DATA_FILES
view. The example is as follows:
SELECT tablespace_name, FILE_NAME, BYTES, AUTOEXTENSIBLE FROM DBA_DATA_FILES;
If you need to modify the size of the table space, you can use the ALTER DATABASE
command. The example is as follows:
ALTER DATABASE DATAFILE 'path_to_datafile' RESIZE 200M;
Through the above Skills, database administrators can better manage users and table spaces in Oracle databases to ensure database security and performance. Good user and table space management is the foundation of any database management work. I hope the above content will be helpful to you.
The above is the detailed content of Management skills of users and table spaces in Oracle database. For more information, please follow other related articles on the PHP Chinese website!