What are the benefits of PL SQL packages?
PL/SQL has these advantages:
- Tight Integration with SQL.
- High Performance.
- High Productivity.
- Portability.
- Scalability.
- Manageability.
- Support for Object-Oriented Programming.
- Support for Developing Web Applications.
What is PL SQL package?
In PL/SQL, a package is a schema object that contains definitions for a group of related functionalities. A package includes variables, constants, cursors, exceptions, procedures, functions, and subprograms. It is compiled and stored in the Oracle Database. Typically, a package has a specification and a body.
How do I declare a global variable in PL SQL?
PL/SQL variables must be declared in the declaration section or in a package as a global variable. When you declare a variable, PL/SQL allocates memory for the variable’s value and the storage location is identified by the variable name.
What are the advantages and disadvantages of PL SQL?
Advantage of Using PL/SQL
- Better performance, as SQL is executed in bulk rather than a single statement.
- High Productivity.
- Tight integration with SQL.
- Full Portability.
- Tight Security.
- Support Object Oriented Programming concepts.
What are private components in Plsql packages?
It consists of the definition of all the elements that are present in the package specification. It can also have a definition of elements that are not declared in the specification, these elements are called private elements and can be called only from inside the package.
What is the difference between package and package body in Oracle?
Introducing to the PL/SQL package body A PL/SQL package consists of two parts: package specification and package body. If the package specification has cursors or subprograms, then the package body is mandatory. Otherwise, it is optional. Both the package body and package specification must be in the same schema.
What are the two variables supported by PL SQL?
Variable Scope in PL/SQL: There are two types of variable scope: Local Variable: Local variables are the inner block variables which are not accessible to outer blocks. Global Variable: Global variables are declared in outermost block.
Is PL SQL case sensitive?
PL/SQL keywords are not case-sensitive, so lower-case letters are equivalent to corresponding upper-case letters except within string and character literals.
What are the most important characteristics of PL SQL?
Features of PL/SQL
- PL/SQL is tightly integrated with SQL.
- It offers extensive error checking.
- It offers numerous data types.
- It offers a variety of programming structures.
- It supports structured programming through functions and procedures.
- It supports object-oriented programming.
How is standard package defines the PL / SQL environment?
How STANDARD Package Defines the PL/SQL Environment What is a Package? A package is a schema object that groups logically related PL/SQL types, variables, constants, subprograms, cursors, and exceptions. A package is compiled and stored in the database, where many applications can share its contents.
Is there a way to run PL / SQL locally?
Some Oracle tools, such as Oracle Forms, contain a PL/SQL engine that lets you run PL/SQL locally. You can even use PL/SQL for some database applications in place of 3GL programs that use embedded SQL or Oracle Call Interface (OCI). PL/SQL program units include:
What does a stored procedure in PL / SQL mean?
Oracle Database PL/SQL User’s Guide and Reference and “Handling Run-Time PL/SQL Errors” A stored procedure, function, or package is a PL/SQL program unit that: Has a name. Can take parameters, and can return values. Is stored in the data dictionary. Can be called by many users.
When to use the accessible by clause in PL / SQL?
The ACCESSIBLE BY clause of the package specification lets you specify a white list of PL/SQL units that can access the package. You use this clause in situations like these:
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