As a Database administrator

A database administrator (short form DBA) is a person responsible for

•  the installation,
•  configuration, 
• upgrade, 
• administration,
•  monitoring and
•  maintenance of databases in an organization.^[1]

The role includes the development and design of database strategies,
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.

Database administrator Skill:

• Communication skills
• Knowledge of database theory
• Knowledge of database design
• Knowledge about the RDBMS itself, e.g. Oracle Database, SAP Sybase Adaptive Server Enterprise, IBM DB2, Microsoft SQL Server, PostgreSQL
• Knowledge of Structured Query Language (SQL) and procedural extension language, e.g. PL/SQL, SQL/PSM, Transact-SQL
• General understanding of distributed computing architectures, e.g. Client/Server, Internet/Intranet, Enterprise
• General understanding of the underlying operating system, e.g. Windows, Unix, Linux
• General understanding of storage technologies, memory management, disk arrays, NAS/SAN, networking

Duties Database administrator:

A database administrator's responsibilities can include the following tasks:^[8]

• Installing and upgrading the database server and application tools
• Allocating system storage and planning future storage requirements for the database system
• Modifying the database structure, as necessary, from information given by application developers
• Enrolling users and maintaining system security
• Ensuring compliance with database vendor license agreement
• Controlling and monitoring user access to the database
• Monitoring and optimizing the performance of the database
• Planning for backup and recovery of database information
• Maintaining archived data
• Backing up and restoring databases
• Contacting database vendor for technical support
• Generating various reports by querying from database as per need

 

Job titles Database administrator:

DBAs are also known by the titles Database Coordinator or Database Programmer, although a database programmer requires more advanced skills in SQL programming than a DBA may have, and a Database Programmer may not have and does not require the skills of database administration, backing up, restoring, monitoring or tuning to do their job well.^[2]
The role is closely related to the other jobs of Database Analyst, Database Modeller, Programmer Analyst, and Systems Manager.^[2]
Some organizations^{[clarification needed]} have a hierarchical level of database administrators, generally:^[9]

• Data Analysts/Query designers
• Junior DBAs
• Midlevel DBAs
• Senior DBAs
• DBA consultants
• Manager/Director of Database Administration/Information Technology