A database administrator is a person responsible for the installation, configuration, upgrade, administration, monitoring and maintenance of databases in an organization.
The role includes the system monitoring and improving database performance and capacity, and planning for future expansion requirements. They may also plan, co-ordinate and implement security measures to safeguard the database.
MS SQL Server DBA role largely responsible for providing operational database services to the organization. Some of the primary responsibilities of this role would include owning, tracking and resolving database related incidents and requests, fulfilling requests and resolving incidents within SLAs, reviewing service related reports on a daily basis to ensure service related issues are identified and resolved within established SLAs, responding to database related alerts and escalations and working with database engineering to come up with strategic solutions to recurring problems.