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4

The cost of reading and writing temporary files while evaluating a query can be reduced by

A. building indices

B. pipelining

C. join ordering

D. none of the above

Correct Answer :

B. pipelining


Related Questions

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4

Which of the following concurrency control schemes is not based on the serializability property?

A. Two - phase locking

B. Graph-based locking

C. Time-stamp based locking

D. None of these .

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4

Which normal form is considered adequate for normal relational database design?

A. 2NF

B. 5NF

C. 4NF

D. 3NF

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4

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

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4

In 2NF

A. No functional dependencies (FDs) exist.

B. No multivalued dependencies (MVDs) exist.

C. No partial FDs exist.

D. No partial MVDs exist.

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4

The language that requires a user to specify the data to be retrieved without specifying exactly how to get it is

A. Procedural DML.

B. Non-Procedural DML.

C. Procedural DDL.

D. Non-Procedural DDL.

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4

In SQL the word natural can be used with

A. inner join

B. full outer join

C. right outer join

D. all of the above

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4

______defines the structure of a relation which consists of a fixed set of attribute-domain pairs.

A. Instance

B. Program

C. Schema

D. Super Key

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4

In SQL, testing whether a subquery is empty is done using

A. DISTINCT

B. UNIQUE

C. NULL

D. EXISTS

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4

What is a disjoint less constraint?

A. It requires that an entity belongs to no more than one level entity set.

B. The same entity may belong to more than one level.

C. The database must contain an unmatched foreign key value.

D. An entity can be joined with another entity in the same level entity set.

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4

A ____ key specifies a uniqueness constraint that no two distinct tuples in any state r of relation R can have the same value for super key.

A. Sub

B. Parent

C. Candidate

D. Super

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4

The keyword to eliminate duplicate rows from the query result in SQL is

A. DISTINCT

B. NO DUPLICATE

C. UNIQUE

D. None of the above

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4

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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4

_____ First proposed the process of normalization.

A. Edgar. W

B. Edward Stephen

C. Edgar F. Codd

D. Edward Codd

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4

____ table store information about database or about the system.

A. SQL

B. System

C. Nested

D. None of these

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4

Union operator is a :

A. Unary Operator

B. Ternary Operator

C. Binary Operator

D. Not an operator

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4

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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4

Which of the following relational algebraic operations is not from set theory?

A. Union

B. Intersection

C. Cartesian Product

D. Select

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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

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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4

In E-R Diagram total participation is represented by

A. Double lines

B. Single line

C. Dashed lines

D. Triangle

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4

The full form of GUI is _________

A. Government Union Internet

B. Graphical Unit Interface

C. Graphical User Interface

D. Graphical University Interface

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4

Which of the following relational algebra operations do not require the participating tables to be union-compatible?

A. Union

B. Intersection

C. Difference

D. Join

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4

The relational model is based on the concept that data is organized and stored in two-dimensional tables called ______

A. Fields

B. Records

C. Relations

D. Keys

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4

______is a preferred method for enforcing data integrity

A. Constraints

B. Triggers

C. Stored procedure

D. Cursors

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4

______ keyword is used to find the number of values in a column.

A. TOTAL

B. ADD

C. COUNT

D. SUM

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4

Maximum height of a B+ tree of order m with n key values is

A. Logm(n)

B. (m+n)/2

C. Logm/2(m+n)

D. None of these

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4

Which of the following statement on the view concept in SQL is invalid?

A. All views are not updateable

B. The views may be referenced in an SQL statement whenever tables are referenced.

C. The views are instantiated at the time they are referenced and not when they are defined.

D. The definition of a view should not have GROUP BY clause in it.

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4

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

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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4

A ______ module is typically designed so that it will run on a user workstation or personal computer.

A. Software

B. Server

C. Program

D. Client