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Database Users
and
Administrator
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Learners Support Publications
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Database Users and Administrator
• Primary goal of the database system is to
retrieve information and store new
information in the database
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There are two types of users
• Database Users
• Database Administrators
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Database Users
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There are four types of users
• Native users
• Application Programmers
• Sophisticated Users
• Specialized Users
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Native Users
They are unsophisticated users who interact
with the system by invoking one of the
application program that have been written
previously.
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Application Programmers
They are computer professionals who write
application programs.
Application programmers can choose from
many tools to develop user interfaces.
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Sophisticated Users
They interact with the system without writing
programs. Instead they write their requests
in a database query language.
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Specialized Users
They are sophisticated users who write
specialized database applications that
do not fit in to the traditional dataprocessing frame work.
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Database
Administrator (DBA)
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Roles & Responsibilities of
Database Administrator
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DBA
DBA is the person or group that is
responsible for supervising both the
data base and the use of the DBMS
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Roles of DBA
1. Policy Formulation and Implementation
1.
2.
3.
4.
Access privileges
Security
Disaster planning
Archives
2. Data Dictionary Management
3. Training
4. DBMS Support
1. DBMS evaluation and selection
2. DBMS responsibility
5. Data Base Design
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Policy Formulation and
Implementation
DBA
formulates
policies
and
communicates these policies to users.
Among
these
policies
are
those
covering access privilege, security,
disaster planning, and archives.
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Access Privilege
Access to every table and field in the
database is not a necessity for every
user.
User A
Access
denide
Access
permitted
Cus_no
Name
City
State
Balance
SR_no
124
Menon
Kochi
Kerala
10500
6
256
Mathew Kochi
Kerala
25000
3
458
Mahin
Thrissur Kerala
35500
11
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Security
•
Security refers to the prevention of
unauthorized access to the database
•
Once access privilege have been
specified and security features are in
place, DBA draws up policies to explain
the security privileges and then
distributes these policies to authorized
users.
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Planning for Disaster
•
A database may be harmed by some
physical problems or by some natural
disasters.
•
For this the DBA’s responsibility is to
establish and implement backup and
recovery procedures.
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Archives
•
This tells that data need to be kept in the
database for only a limited time.
•
A data archive is a place where a record
of certain corporate data is kept
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Data Dictionary Management
•
Data dictionary contains a wider range of
information, including at the very least,
information on tables, indexes, and
programs.
•
The creation and distribution of
appropriate reports from the data
dictionary
is
another
of
DBA”s
responsibility.
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DBMS Support
•
DBA is responsible for all the aspects of
a DBMS within an organization, including
the selection and maintenance of the
system.
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DBMS Evaluation and Selection
•
DBA is responsible for the evaluation and
selection of the DBMS. In order to over
see this responsibility, it sets up a check
list.
•
DBA must evaluate each prospective
purchase of a DBMS in terms of all the
categories.
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Responsibility for DBMS
•
DBA installs the DBMS in a way that is
suitable for the organization.
•
If the DBMS configuration need to be
changed, DBA makes the changes.
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Database Design
•
DBA is in charge of database design at
both the information level and the
physical level.
•
It is also in charge of evaluating changes
in requirements to determine whether a
change in the database design is
warranted. If so, DBA makes the
changes and reports it to affected users.
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Questions ?
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