In-depth exploration of the concepts and characteristics of different Oracle users

Oracle is one of the most popular relational database management systems in the world and is widely used in enterprise-level application development. In Oracle, there are multiple users who can connect to the database and perform various operations. Different users can have different permissions and roles, depending on how they connect to the database and their responsibilities within the company. In this article, we will delve into the concepts and characteristics of different users of Oracle.

Oracle User

In Oracle, a user is an individual who connects to the database and manages it. Each user has a unique username and password, and usernames must be unique. Oracle users can be client applications, people, or other databases and can connect to the database from a local computer or a remote computer.

System users of Oracle

Oracle has several system users, which can perform some special tasks related to system management and operation. System users include sys, system, sysaux, sysdba, and sysoper. These users can perform advanced functions such as creating and deleting users, authorizing, backing up and restoring databases, etc.

Oracle's application user

Application user is a client program that interacts with the Oracle database and is mainly used to perform specific application tasks. For example, an application may need to extract, transform, and load data, which requires connecting to a database and performing operations. Application users use their username and password to connect to the database and perform specific tasks within the application.

Normal users of Oracle

Normal users are the most common user type in the Oracle database. These users use their own username and password to connect to the database and perform various operations. Regular users can be assigned different permissions and roles, depending on their responsibilities within the company and the level of access they require. Ordinary users can use SQL commands to query, update, delete, and insert data in the database.

Oracle's DBA user

The database administrator (DBA) user is the administrator responsible for database management and maintenance. DBA users connect to the database from client applications or other databases and use their own username and password to perform administrative tasks. DBA users can perform advanced tasks such as creating, dropping, and modifying tables, indexes, and other database objects. DBA users need to have a deep understanding of Oracle database technology to be able to provide support and advice to other users.

Permissions and roles of Oracle users

Each user in Oracle has a set of permissions and roles. Permissions define what operations a user can perform in the database, while roles define what objects the user can access. Permissions and roles can be assigned or denied as needed.

Oracle's permissions can be divided into system permissions and object permissions. System permissions control a user's overall access to the database, such as creating and deleting the database, and backing up and restoring the database. Object permissions control user access to specific objects in the database (such as tables, views, and procedures). For example, a user might be granted read permissions on a table, but not modify or delete data in the table.

Oracle's roles include predefined roles and custom roles. Predefined roles are a set of common roles provided in Oracle, such as connect, resource, and dba. Custom roles are new roles created by administrators that can be assigned different permissions for specific applications or users.

Summary

In Oracle, there are multiple users who can connect to the database and perform various operations. Different users can have different permissions and roles, depending on how they connect to the database and their responsibilities within the company. Ordinary users are the most common user type in the Oracle database. Administrator users need to have an in-depth understanding of Oracle database technology to be able to provide support and suggestions to other users. Oracle's permissions and roles can be assigned or denied as needed to control user access to and operations on the database.

The above is the detailed content of In-depth exploration of the concepts and characteristics of different Oracle users. For more information, please follow other related articles on the PHP Chinese website!