Wiktionary
database administrator
n. (context computing English) a person who is responsible for the logical and physical design of databases, and normally for all aspects of their recoverability, integrity, security, availability and performance
Wikipedia
Database administrator
Database administrators (DBAs) use specialized software to store and organize data.
The role may include capacity planning, installation, configuration, database design, migration, performance monitoring, security, troubleshooting, as well as backup and data recovery.