Which data structure is used in Oracle?

Tables. The table is the basic data structure used in a relational database. A table is a collection of rows.

What is the structure of PL SQL?

PL/SQL is a block-structured language whose code is organized into blocks. A PL/SQL block consists of three sections: declaration, executable, and exception-handling sections. In a block, the executable section is mandatory while the declaration and exception-handling sections are optional.

Is Oracle structured database?

The database has logical structures and physical structures. Because the physical and logical structures are separate, the physical storage of data can be managed without affecting the access to logical storage structures. The section contains the following topics: Overview of Oracle Grid Architecture.

What is PL SQL data types?

PL/SQL has two kinds of data types: scalar and composite. The scalar types are types that store single values such as number, Boolean, character, and datetime whereas the composite types are types that store multiple values, for example, record and collection.

What is physical database structure Oracle?

The physical database structure comprises of datafiles, redo log files and control files. Datafiles. Datafiles contain database’s data. The data of logical data structures such as tables and indexes is stored in datafiles of the database. One or more datafiles form a logical unit of database storage called a tablespace …

What is physical and logical structure of Oracle Database?

Oracle database architecture depends upon two types of storage: physical and logical. Physical (disk) storage contains all the files in the database. Logical storage structures, such as tablespaces, segments, extents, and blocks, appear on the disk but are not part of the dataset.

How many sections are there in PL SQL?

A PL/SQL block has up to four different sections, only one of which is mandatory: Header. Used only for named blocks. The header determines the way the named block or program must be called.

What is the difference between SQL and Plsql?

SQL is data oriented language. PL/SQL is application oriented language. SQL is used to write queries, create and execute DDL and DML statments. PL/SQL is used to write program blocks, functions, procedures, triggers and packages.

Is Oracle structured or unstructured?

In the context of database systems, Oracle has been supporting Unstructured Data for over a decade.

Can Oracle handle unstructured data?

From block storage to data lakes, Oracle offers flexible solutions that handle both structured and unstructured data.

What are the main four variable types used in PL SQL?

Data types (PL/SQL)

PL/SQL data type	DB2® SQL data type	Description
INT	INT	Signed four-byte integer numeric data
INTEGER	INTEGER	Signed four-byte integer numeric data
LONG	CLOB (32760)	Character large object data
LONG RAW	BLOB (32760)	Binary large object data

What are the 3 files of physical structure of Oracle database?

Introduction to Physical Storage Structures

• Data files and temp files. A data file is a physical file on disk that was created by Oracle Database and contains data structures such as tables and indexes.
• Control files. A control file is a root file that tracks the physical components of the database.
• Online redo log files.

What are the three physical components of Oracle database?

physical components of oracle database are control files,redo log files and datafiles.

What are the 3 files of physical structure of Oracle Database?

What is Oracle Database structure with diagram?

There are three major structures in Oracle Database server architecture: memory structures, process structures, and storage structures. A basic Oracle database system consists of an Oracle database and a database instance. The database consists of both physical structures and logical structures.

How many types of blocks are there in PL SQL?

There are three types of blocks that make up a PL/SQL program: Anonymous blocks: These are the unnamed PL/SQL blocks that are embedded within an application or are issued interactively. Procedures: These are the named PL/SQL blocks.

What are the different types of blocks in Plsql?

PL/SQL blocks can include variables, SQL statements, loops, constants, conditional statements and exception handling.

Is Oracle and PL SQL same?

PL/SQL is Oracle’s procedural language extension to SQL. PL/SQL allows you to mix SQL statements with procedural constructs. PL/SQL provides the capability to define and execute PL/SQL program units such as procedures, functions, and packages.

Is PL SQL easy to learn?

Its database architectural principles are the same and it operates with SQL (Structured Query Language), plus Oracle’s own PL/SQL extensions. It’s relatively easy to learn — as long as you have a good handle on Linux and SQL.

What is the PL/SQL architecture?

Basic understanding of the PL/SQL architecture is beneficial to PL/SQL programmers. The PL/SQL compilation and runtime system is an engine that compiles and runs PL/SQL units. The engine can be installed in the database or in an application development tool, such as Oracle Forms.

What is data type in PL/SQL?

The data type can be any PL/SQL data type. The PL/SQL data types include the SQL data types. A data type is either scalar (without internal components) or composite (with internal components). This example declares several variables with scalar data types.

What is the basic unit of a PL/SQL program?

The basic unit of a PL/SQL source program is the block, which groups related declarations and statements. A PL/SQL block is defined by the keywords DECLARE, BEGIN, EXCEPTION, and END. These keywords divide the block into a declarative part, an executable part, and an exception-handling part.

What are the PL/SQL language fundamental components?

The PL/SQL language fundamental components are explained. Any character data to be processed by PL/SQL or stored in a database must be represented as a sequence of bytes. The byte representation of a single character is called a character code. A set of character codes is called a character set .