Monthly Archives: September 2019

by E-Computer Concepts 9 months ago

Arrays in C++

Arrays are used when you want to store related data of same type together with the same name so that you can access them easily. Arrays can be defined as data structures that allow to store group of data of same datatype. You can retrieve...

by E-Computer Concepts 9 months ago

Virtual Function in C++

Virtual function existing in effect but not in reality. Virtual function are primarily used in inheritance. Let us suppose you have a class base as shown in the following program and two classes derv1 and derv2 are publicly derived from...

by E-Computer Concepts 9 months ago

What is Booting?

Booting is the process of switching on the computer. The disk from which startup or booting is done is called Bootable disk or Startup disk or System disk. We can define bootings as “It is loading of set of programs from the ROM...

by E-Computer Concepts 9 months ago

Data Constraints

Oracle allows data constraints to be attached to columns with the help of SQL syntax that checks data for integrity prior storage. Once data constraints are part of a table column construct, the oracle database engine checks for the data...

by E-Computer Concepts 10 months ago

Database Security Issues

Database introduce a number of unique security requirements for their users and administrators. On one hand, databases are designed to promote open and flexible access to data. On the other hand, it’s this same open access that makes...

by E-Computer Concepts 10 months ago

Functions of DBMS

The function performed by a typical DBMS are the following: Data Definition The DBMS provides functions to define the structure of the data in the application. These include defining and modifying the record structure, the type and...

by E-Computer Concepts 10 months ago

Oracle Startup Commands

The syntax of the STARTUP command with its important options has been displayed: STARTUP [FORCE][RESTRICT][PFILE=filename][OPEN[RECOVER][database][READ ONLY]|MOUNT|NOMOUNT] FORCE : Used when a startup does not occur as a result of...

by E-Computer Concepts 10 months ago

Bottom Up Testing (Testing Strategy)

Bottom-up testing, is the converse of top down testing. It involves testing the modules at the lower levels in the hierarchy, and then working up the hierarchy of modules until the final module is tested. The advantage of bottom-up testing...

by E-Computer Concepts 10 months ago

Top Down Testing (Test Strategy)

Top-Down Testing tests the high levels of a system before testing its detailed components. The program is represented as a single abstract component with sub components represented by stubs. Stubs have the same interface as the component...

by E-Computer Concepts 10 months ago

Black Box Testing

Black box testing, also called behavioral testing, focuses on the functional requirements of the software. That is, black box testing enables the software engineer to derive sets of input conditions that will fully exercise all functional...