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Oracle Tutorial Interview Questions

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Oracle Tutorial Interview Questions

Oracle database is a relational database management system (RDBMS) from Oracle Corporation. This article will explain a complete overview of the Oracle database, features, history, and editions. Before discussing the oracle, we will first need to know about the database.

Components of physical database structure are given below.

  •  One or more data files.
  •  Two or more redo log files.
  • One or more control files.
  • Bulk copy or BCP in Oracle, is used to import or export data from tables and views but it does not copy structure of same data.
  • The main advantage of BCP is fast mechanism for coping data and you can also take the backup of data easily.

RAW datatype is used to store values in binary data format. The maximum size for a raw in a table in 32767 bytes.

Nested table is a data type in Oracle which is used to support columns containing multi valued attributes. It also hold entire sub table.

Data Manipulation Language (DML) is used to access and manipulate data in the existing objects. DML statements are insert, select, update and delete and it won’t implicitly commit the current transaction.

  • A table is the basic unit of data storage in the Oracle database.
  • Data is stored in rows and columns.
    “CREATE TABLE” statement is used to create a new table.

In an aggregate function, multiple rows or records are combined, and operations performed on a set of values to get a single value as output. Common aggregate functions include:

  • Sum
  • Count
  • Average

Bulk copy or BCP is for importing and exporting data from tables and views. It doesn’t copy the structure of the same data. It has a quick mechanism for copying data and allows the users to easily take the data backup.

Oracle reports are use to make business enable with the facility to provide information of all level within or outside in a secure way. Oracle report uses REP files and RDF file extensions.

 

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