Data Abstraction Notes Questions with Answers PDF Download - 87

The identification, aggregation and instantiation are abstraction concepts used in

1. intension and extension models
2. classes and nodes models
3. concrete models
4. semantic data models

All the information about usage standards, decision of designs, user information and description of application programs is stored in

1. data repository
2. data utility
3. data compiler
4. data host

The type of data in SQL which includes TIME and DATE fields plus six positions for other decimal fractions is classified as

1. timestamp
2. interval stamp
3. Boolean stamp
4. literal string stamp

In Three-Schema Architecture, the schema which gives the description about physical data model, access path and details of storage of data is called

1. logical schema
2. conceptual schema
3. internal schema
4. external schema

The local concurrency control, storage of data on disk pages and the buffering of disk pages are considered as tasks of

1. client level
2. server level
3. open programming level
4. database connectivity level