Management skills of users and table spaces in Oracle database

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.

1. User management skills

1. Create a user

In the Oracle database, you can create a user through theCREATE USERcommand. The example is as follows:

CREATE USER new_user IDENTIFIED BY password;

2. Authorize user permissions

Use theGRANTcommand to authorize corresponding permissions to the user. The example is as follows:

GRANT SELECT, INSERT, UPDATE, DELETE ON table_name TO user_name;

3. Modify the user password

If you need to change the user password, you can use theALTER USERcommand, the example is as follows:

ALTER USER user_name IDENTIFIED BY new_password;

4. Delete the user

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;

2. Table space management skills

1. Create table space

In Oracle database, you can useCREATE TABLESPACECommand to create a table space, the example is as follows:

CREATE TABLESPACE new_tablespace DATAFILE 'path_to_datafile' SIZE 100M;

2. Specify the table space for the user

To specify the default table space for the user, you can use theALTER USERcommand, the example is as follows ：

ALTER USER user_name DEFAULT TABLESPACE new_tablespace;

3. Check the table space usage

You can check the table space usage through theDBA_DATA_FILESview. The example is as follows:

SELECT tablespace_name, FILE_NAME, BYTES, AUTOEXTENSIBLE FROM DBA_DATA_FILES;

4 . Modify the size of the table space

If you need to modify the size of the table space, you can use theALTER DATABASEcommand. The example is as follows:

ALTER DATABASE DATAFILE 'path_to_datafile' RESIZE 200M;

Conclusion

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.

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