1. **Database Design and Maintenance**: Responsible for the structural design of the database, table design, index optimization, views, stored procedures, etc., ensuring database performance and scalability.

2. **Data Backup and Recovery**: Conduct regular data backups and develop disaster recovery plans to ensure data security and integrity.

3. **Performance Monitoring and Optimization**: Monitor database performance, analyze slow queries and resource bottlenecks, and perform tuning (such as index optimization, query optimization, database configuration adjustments).

4. **Security Management**: Set user permissions, data encryption, audit logs, etc., to ensure database security.

5. **Troubleshooting and Support**: Address database-related failures and errors, provide technical support, and ensure high availability of the database.

6. **Upgrade and Patch Management**: Manage database version upgrades, promptly apply security patches, and maintain system stability and security.

7. **Capacity Planning and Expansion**: Plan for storage expansion and capacity based on data growth trends to ensure system scalability.

8. **Automation and Scripting**: Write automation scripts to reduce repetitive tasks and improve efficiency, such as backups and log cleaning tasks.

9. **Database Replication and High Availability**: Configure database replication (such as master-slave replication, clustering) to ensure high availability of the system and data synchronization.

10. **Collaboration with Development and Operations Teams**: Communicate database design requirements with the development team and collaborate with the operations team to ensure stable system operation.