What is a Database and DBMS?

A database is an organized collection of information.

To manage databases, You need database management systems (DBMS). A DBMS is a program that
Stores, Retrieves, and Modifies data in the database on request

Comments

Oracle Developer Technical Interview Questions

Here i am putting all the questions i had faced during my interviews ... Interview at “3i InfoTech”, Chennai: 1) What is flow of execution of WHEN-NEW-FORM-INSTANCE, WHEN-NEW-BLOCK-INSTANCE, and WHEN-NEW-ITEM-INSTANCE? 2) What is PRE-QUERY and POST-QUERY? When these triggers will fire? 3) If the object library with some blocks and triggers if a form inherited that object library if u doesn’t need some trigger to be inherited the can u delete that trigger from that form? 4) How u can call a report from a form? Which property u has set in runtime? 5) If u create a relation between two blocks in the form what are all triggers it will create? 6) What is a ref cursor? 7) To call a form which type of built-ins u has to use? 8) What is the main difference between expand and variable property for a text item in reports. 9) In a report layout there is accepted and rejected fields and it has a parameter when u run the report based on the parameter the output should sh...

Communicating with a RDBMS Using SQL

What is SQL? SQL Stands for Structured Query Language. I t is the international standard language for relational database management systems. It is useful for accessing and manipulating data in a databases. To access the database, you execute a structured query language (SQL) statement, which is the American National Standards Institute (ANSI) standard language for operating relational databases.

INDEX Definition

In Oracle, an INDEX is a database object intended to improve the performance of SELECT queries. Indexes are created on table columns, and the index stores all the values of the column under index segments. If the SELECT query uses an indexed column in any of the WHERE conditions, the query uses the index segment instead of performing a full table scan. This results in enhanced query performance.

Developer At Your Service

Search This Blog