Database Administration Questions

1. DBMS

2. RDBMS (Relational)

3. ORDBMS (Object Relational)

4. DDBMS (Distributed)

5. FDBMS (Federated)

6. HDDBMS (Homogeneous)

7. HDBMS (Hierarchical)

8. NDBMS (Networked)

LDI is the capacity to change the conceptual schema without having to change external schemas or application programs.

The description of a data base is called the database schema , which is specified during database design and is not expected to change frequently . A displayed schema is called schema diagram .We call each object in the schema as schema construct.

They describe the details of how data is stored in the computers

High level data models provide the concepts that are close to the way many users perceive data

Database provides necessary means to achieve this abstraction. By structure of a database we mean the data types, relations, and constraints that should hold on the data.

A view may be a subset of the database or it may contain virtual data that is derived from the database files but is not explicitly stored .

Routable protocols can work with a router and can be used to build large networks. Non-Routable protocols are designed to work on small, local networks and cannot be used with a router