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WorksheetsThree level architecture
Total questions: 15
Worksheet time: 5mins
DBTG developed proposal for DB
1970
1975
1971
Entity attributes relationship are defined at
External level
Conceptual level
Internal level
Extension is performed after——— of database has been finalized
Intension
Structure
Storage of DB
Sub schemas is another name of
Conceptual schemas
External schemas
Internal schemas
Virtual data is observed at
External level
Conceptual level
Internal level
Internal level is responsible to store data on
Storage media
Files orgnization
Data structure
All
Conceptual level contain
Definition of data
Structure of data
Type of data
All
Three level are depicted by three models known
External schemas
Internal schemas
Three level schemas
Conceptual schemas
Database schemas is also called
Extension of database
Intension of database
Three level schemas
Space utilisation is performed by
Encoding scheme
Data compression
Indexing
Conceptual level is described in
External schemas
Conceptual schemas
Internal schemas
Permanent structure of database is
Extension of database
Intension of database
Three level schemas
Database instance is also called
Extension of database
Intension of database
Three level schemas
Security can be maintained by
Password
DBA
Data encryption
Data stored in
Binary format
Operating system
Storage device
