What's the difference between DBA and DA? In categorization of users I have seen two different categorizations:

First one:


End user
DBA
DBP


and Second one:


End user
DBA
DA


What's the difference between DA and DBA ?
According to this and that, a DA is a Data Administrator.  The DA is a buisness oriented individual more involved in requirements gathering, analysis, and design than the DBA.  They establish the flow of data around the organization and between databases and other systems.  Here is a section from the second site:


  Database Administration
  
  Any reasonably sized organization that relies on a database for its business 
  processes will probably have a Database Administrator or DBA.
  
  The DBA is responsible for:
  
  
  Installing and configuring the DBMS
  Assisting in the implementation of information systems
  Monitoring the performance of the database and tuning the DBMS for optimal performance
      Maintaining documentation including recording all changes to the database and DBMS.
  Ensuring data integrity is maintained and appropriate backups are made. 
  
  
  Thus a DBA is mainly concerned with the day to day operational aspects of database systems.
  
  Data Administration
  
  Many organizations, in addition to DBAs, will also have a Data Administrator.
  DAs are concerned with the data needs and data flows throughout the entire organization.
  Thus DAs are responsible for:
  
  
  Specifying data standards across databases
  Establishing policies: data usage, security and authorization, data flows into and out of the organization
  Assisting the application development process by identifying data resources in the organization
  Arbitrating the sharing of data across departments
  Increasing the return on an organization's data investment