You are a database administrator in charge of database performance tuning for an e-commerce website. Which action would be part of your role?

As a database administrator in charge of database performance tuning for an e-commerce website, your role would involve several actions:

1. Monitoring Database Performance: Regularly check the performance of the database to identify any issues or bottlenecks that could slow down the website.

2. Optimizing Queries: Review and optimize SQL queries to ensure they run as efficiently as possible. This could involve rewriting queries, creating indexes, or changing database schemas.

3. Capacity Planning: Predict future database needs and plan for them. This could involve adding more storage, upgrading hardware, or scaling out to more servers.

4. Implementing Caching: Use caching to reduce the load on the database. This could involve setting up a Redis or Memcached server to cache frequently accessed data.

5. Regular Maintenance: Perform regular maintenance tasks such as updating statistics, rebuilding indexes, and defragmenting disks.

6. Backup and Recovery: Ensure that the database can be quickly restored in the event of a failure. This could involve setting up regular backups and testing restore procedures.

7. Security: Ensure that the database is secure from unauthorized access. This could involve setting up firewalls, encrypting data, and managing user permissions.