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Introduction Real Application Clusters (RAC) allows multiple computers to run Oracle software simultaneously while accessing a single database, therefore providing a clustered database. In the previous non-RAC oracle database, a single instance accesses a single database. And we know that clustering is the task of assigning a set of objects into groups. In an Oracle [...]

Introduction to Constraints Oracle constraints are defined as the rules to preserve the data integrity in the application. These rules are imposed on a column of a database table, so as to define the basic behavioral layer of a column of the table and check the sanctity of the data flowing into it. The data [...]

Cursors are one of the most common and fundamental terms in the database terminology. It is one of the core database programming concepts, which forms a basic unit of execution of SQL statement. A cursor is a pointer, which points towards a pre allocated memory location in the SGA. For transparent understanding, it is a [...]

In database terminology, triggers are the objects which demonstrate the logic of schedule and automation. Triggers are automatically invoked at a defined event and timing without any explicit calls. The logic embedded within the trigger and invocation must be well directed and synchronized to maintain database purity. Oracle 11g made remarkable enhancements in Database Triggers. [...]

With each and every release of RDBMS, Oracle has achieved great commercial success and attained zeniths of exploration. The year 2007 saw the release of Oracle RDBMS version 11g (second grid computed version after Oracle 10g). First release of Oracle 11g facilitated the developers with multiple enhancements and language features. The introduction of advanced core [...]

By definition, an operator works with the data items (known as operands) and returns a result. Oracle provides multiple operators under various categories which can be used in queries to filter the result set. In SQL, EXISTS is an operator which can be used in WHERE clause to validate an “IT EXISTS” condition. In the [...]

Oracle Sequences have efficiently fulfilled the requirement of generation of unique numbers in a table. They can be casted as Primary Key of a table. In the current article, we shall note the applications of a Sequence, its features and behavior in various scenarios. Introduction Oracle introduced Sequences in its sixth release (Oracle 6) to [...]