What are the major functions of the database administrator?

Five main functions of a database administrator are:

·To create the scheme definition

·To define the storage structure and access methods

·To modify the scheme and/or physical organization when necessary

·To grant authorization for data access

·To specify integrity constraints 

Managing database structure, controlling concurrent processing, managing processing rights and responsibilities, developing database security, providing for database recovery, managing the DBMS and maintaining the data repository.