On these slides i describe all the detail about Types and Functions of DDBMS.

1. Types &
Functions Of
DDBMS

2. BY: Adeel Rasheed
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 https://www.slideshare.net/adeel02

3. Types Of DDBMS
 Homogeneous DDBMS
 Heterogeneous DDBMS
DDBMS
Homogenous Heterogeneous

4. Homogeneous DDBMS
 The sites use very similar software.
 Each site is aware of all other sites and cooperates
with other sites to process user requests.
 The database is accessed through a single
interface as if it is a single database.

5. Same software

6. Types Of Homogeneous DDBMS
 Autonomous − Each database is independent that
functions on its own. They are integrated by a
controlling application.
 Non-autonomous − Data is distributed across the
homogeneous nodes and a central or master DBMS co-
ordinates data updates across the sites.

7. Advantages
 Easy to use
 Easy to mange
 Easy to Design
Disadvantages
 Difficult for most organizations to force a
homogeneous environment

8. Heterogeneous DDBMS
 Different sites use dissimilar schemas and software.
 Query processing is complex due to dissimilar
schemas.
 Transaction processing is complex due to dissimilar
software.
 A site may not be aware of other sites and so there is
limited co-operation in processing user requests.
 Translations required to allow for:
o Different hardware.
o Different DBMS products.
o Different hardware and different DBMS products.

9. Sql oracle

10. Types
 Systems: With full or Partial Functionality
 Gateways: Simple paths are created to other databases
 without benefits of one logical database
 Non-federated MDBS (no local users) and federated
MDBS (FMDBS).

11. Working
 A gateway is a node (router) in a computer network

12.  Advantages
 Huge data can be stored in one Global center from different
data center .
 Different DBMSs may be used at each node.
Disadvantages
 Difficult to mange.
 Difficult to design.

13. Functions Of DDBMS
Basic Functions:
 Data storage
 Security
 Multiuser access control
 Data integrity

14. Functions Of DDBMS
 Also to have following functionality:
 Extended communication services.
 Distributed query processing.
 Extended concurrency control.
 Extended recovery services.