3i Infotech Papers: Sample Questions 174 - 175 of 1245

Examrace Placement Series prepares you for the toughest placement exams to top companies.

Question number: 174

» Database » Oracle

Essay Question▾

Describe in Detail

What is an Oracle Instance?

Explanation

Given figure is oracle instance and oracle database.

Given Figure is Oracle Instance and Oracle Database.

Given figure is oracle instance and oracle database.

  • All running Oracle database is related with an Oracle instance.

  • Oracle allocates a memory area called the System Global when a database is started on a database server Area and starts one or more Oracle processes.

  • Oracle instance is the combination of the SGA and the Oracle processes.

  • An Oracle instance can access only one database at a time, while an Oracle database can be accessed by multiple instances.

  • Oracle database-wide system memory is known as the SGA, the system global area or shared global area.

  • The data and control structures in the SGA are shareable, and all the Oracle background processes and user processes can use them.

Question number: 175

» Basic CS » Data Structures

Essay Question▾

Describe in Detail

What are the notations used in Evaluation of Arithmetic Expression using prefix and postfix forms?

Explanation

Arithmetic Expressions and trees

Arithmetic Expressions and Trees

Arithmetic Expressions and trees

  • Polish and reverse polish are the notations used in evaluation of arithmetic expression using prefix and postfix forms.

Polish notation:

  • Polish notation is also called as prefix notation.

  • A form of notation for logic, arithmetic, and algebra.

  • Its distinguishing feature is that it places operators to the left of their operands.

  • While prefixing the operator to the number, it is called polish notation.

    For example, ( (a + B) *C (D E) ^ (F + G) )

    Prefix notation: ^-*+ABC-DE + FG

Reverse Polish notation:

  • A mathematical notation where every operator follows all of its operands, in contrast to Polish notation, which puts the operator in the prefix position.

  • It suffixes the operator to the number called reverse polish notation.

Ex. . ( (a + B) *C (D E) ^ (F + G) )

Postfix notation: AB + C*DE—FG+^