Knowledge Testing Questions on Oracle

Can objects of the same Schema reside in different tablespaces? 


What is the use of Control File? 

When an instance of an ORACLE database is started, its control file is used to identify the database and redo log files that must be opened for database operation to proceed. It is also used in database recovery. 

Do View contain Data? 

Views do not contain or store data. 

What are the Referential actions supported by FOREIGN KEY integrity constraint? 

UPDATE and DELETE Restrict - A referential integrity rule that disallows the update or deletion of referenced data. DELETE Cascade - When a referenced row is deleted all associated dependent rows are deleted. 

What are the type of Synonyms? 

There are two types of Synonyms Private and Public

What is a Redo Log? 

The set of Redo Log files YSDATE,UID,USER or USERENV SQL functions, or the pseudo columns LEVEL or ROWNUM. 

What is an Index Segment? 

Each Index has an Index segment that stores all of its data. 

Explain the relationship among Database, Tablespace and Data file? 

Each databases logically divided into one or more tablespaces one or more data files are explicitly created for each tablespace.

What are the different type of Segments? 

Data Segment, Index Segment, Rollback Segment and Temporary Segment. 

What are Clusters? 

Clusters are groups of one or more tables physically stores together to share common columns and are often used together. 

What is an Integrity Constrains? 

An integrity constraint is a declarative way to define a business rule for a column of a table. 

What is an Index? 

An Index is an optional structure associated with a table to have direct access to rows, which can be created to increase the performance of data retrieval. Index can be created on one or more columns of a table. 

What is an Extent? 

An Extent is a specific number of contiguous data blocks, obtained in a single allocation, and used to store a specific type of information. 

What is a View? 

A view is a virtual table. Every view has a Query attached to it.  (The Query is a SELECT statement that identifies the columns and rows of the table(s) the view uses.) 

What is Table? 

A table is the basic unit of data storage in an ORACLE database. The tables of a database hold all of the user accessible data. Table data is stored in rows and columns.

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