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According to the levels of abstraction, the schema at the intermediate level is called

A. Logical schema.

B. Physical schema.

C. Subschema.

D. None of the above.

Correct Answer :

D. None of the above.


According to the levels of abstraction, the schema at the intermediate level is called conceptual schema.

Related Questions

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A logical schema

A. is the entire database

B. Describes how data is actually stored on disk.

C. is a standard way of organizing information into accessible parts.

D. All of the above

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Grant and revoke are _____ statements.

A. TCL

B. DCL

C. DDL

D. DML

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4

The clause alter table in SQL can be used to

A. add an attribute

B. delete an attribute

C. alter the default values of an attribute

D. all of the above

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4

Which is the best file organization when data is frequently added or deleted from a file?

A. Sequential

B. Direct

C. Index sequential

D. None of the above

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The values of the attribute describes a particular

A. Entity set

B. File

C. Entity instance

D. Organization

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Which two files are used during operation of the DBMS?

A. Query languages and utilities

B. DML and query language

C. Data dictionary and transaction log

D. Data dictionary and query language

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4

A relational database developer refers to a record as

A. an attribute

B. a tuple

C. a criteria

D. a relation

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4

Change Staff table by removing default of Assistant for position column

A. ALTER TABLE Staff ALTER position DROP DEFAULT;

B. ALTER TABLE Staff ALTER position DEFAULT;

C. ALTER TABLE Staff ALTER DROP DEFAULT;

D. MODIFY Staff ALTER position DROP DEFAULT;

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4

What is data integrity?

A. It is the data contained in database that is non redundant.

B. It is the data contained in database that is accurate and consistent.

C. It is the data contained in database that is secured.

D. It is the data contained in database that is shared.

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4

Employees in a company are each assigned their own office, i.e. for each employee there exists a unique office and for each office there exists a unique employee; This statement is an example of ____ type of relation.

A. 1:1

B. 1: Many

C. Many: One

D. Many : Many

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The normal form that is not necessarily dependency preserving is

A. 2NF

B. 3NF

C. BCNF

D. 4NF

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_____ First proposed the process of normalization.

A. Edgar. W

B. Edward Stephen

C. Edgar F. Codd

D. Edward Codd

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4

Tree structures are used to store data in

A. Network model.

B. Relational model.

C. Hierarchical model.

D. File based system.

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4

The middleware databases in which the business rules act are applicable to _______ tier architectures

A. Single

B. Three

C. Two

D. None

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The ______ key of a relation is the attribute (column) or collection of attributes, which uniquely identify a given tuple.

A. Primary

B. Foreign

C. Candidate

D. Alternate

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In b-tree the number of keys in each node is than the number of its children.

A. one less

B. same

C. one more

D. half

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The collection of information stored in a database at a particular moment is called as ......

A. schema

B. instance of the database

C. data domain

D. independence

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The one guideline to be followed while designing the database is

A. A database design may be ambiguous.

B. It should avoid/reduce the redundancy.

C. Unrelated data should be in the same table so that updating the data will be easy.

D. An entity should not have attributes.

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4

In an E-R, Y is the dominant entity and X is a subordinate entity. Then which of the following is incorrect :

A. Operationally, if Y is deleted, so is X

B. existence is dependent on Y.

C. Operationally, if X is deleted, so is Y.

D. Operationally, if X is deleted, & remains the same.

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A transaction is in state after the final statement has been executed.

A. partially committed

B. active

C. committed

D. none of the above

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Assume transaction A holds a shared lock R. If transaction B also requests for a shared lock on R.

A. It will result in a deadlock situation.

B. It will immediately be rejected.

C. It will immediately be granted.

D. It will be granted as soon as it is released by A .

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4

Data independence means

A. data is defined separately and not included in programs.

B. programs are not dependent on the physical attributes of data

C. programs are not dependent on the logical attributes of data

D. both B and C

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4

operator is used to compare a value to a list of literals values that have been specified.

A. Like

B. COMPARE

C. BETWEEN

D. IN

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HSAM stands for ……….

A. Hierarchic Standard Access Method

B. Hierarchic Sequential Access Method

C. Hierarchic Sequential and Method

D. Hierarchic Standard and Method

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4

In an ER model,_____ is described in the database by storing its data.

A. Entity

B. Attribute

C. Relationship

D. Notation

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The _______ is a set of programs to use and / or modify this data.

A. DBMS

B. System

C. Program

D. Software

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DROP is a statement in SQL.

A. Query

B. Embedded SQL

C. DDL

D. DCL

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The ______ indexes are forced to store only record IDs in the data structure and require at least one additional I/O Operation to retrieve the actual record.

A. Clustered

B. Hashed

C. Un-clustered

D. Collision

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_____clause is an additional filter that is applied to the result.

A. Select

B. Order by

C. Group-by

D. Having

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A DBMS is a ____ user if at most one user can use the system and is mostly restricted to personal computer systems.

A. None

B. Multi

C. Single

D. Concurrent