Role of Oracle Database Specific User Groups

In an Oracle database, there are specific user groups, each with specific privileges and roles. Here's what these user groups do:

1. oper: This user group is the operator group, which has restricted database management privileges. operGroup members can perform some basic database administration tasks, such as starting and stopping database instances, managing database parameters, and so on. However, opergroup members cannot perform some advanced database administration tasks, such as creating and modifying database objects.

2. dba: This user group is the database administrator group, which has the highest level of authority. dbaGroup members can perform all database administration tasks, including creating, modifying, and deleting database objects, and configuring and managing database instances.

3. asmdba: This user group is the Automatic Storage Management (ASM) administrator group, which has permissions to manage ASM instances and ASM storage. asmdbaGroup members can perform ASM-related tasks, such as creating and managing ASM disk groups, adding and removing ASM disks, and so on.

4. backupdba: This user group is the backup and restore administrator group, which has the authority to backup and restore the database. backupdbaGroup members can perform database backup and recovery operations, including creating and managing backup sets, performing data recovery, and more.

5. dgdba: This user group is the Data Guard Administrators group, which has permissions to manage the Data Guard high availability solution. dgdbaGroup members can configure and manage the Data Guard environment, including creating and managing physical and logical standby databases, setting data protection modes, and more.

6. kmdba: This user group is the key management administrator group, which has the authority to manage database encryption and key management. kmdbaGroup members can create and manage encryption keys, perform encryption operations, manage keystores, and more.

7. racdba: This user group is the Real Application Clusters (RAC) administrators group, which has permissions to manage the RAC environment. racdbaGroup members can configure and manage RAC instances, cluster resources, communication between nodes, and more.

8. oinstall: This user group is the Oracle Inventory group, which has the authority to manage the installation and configuration of Oracle software. oinstallGroup members can install and configure Oracle software, including creating Oracle software installation directories, performing software upgrades, and more.

The rights and roles of these user groups can be assigned and adjusted as needed, so that the database administrator can control the user's access and operation rights to the database according to the actual situation.