Oracle Interview Questions And Answers
Page 1 of 95 Oracle 7 Concepts and Architecture Database Structures.
1. What are the components of Physical database structure of
Oracle Database?.
ORACLE database is comprised of three types of files. One or more
Data files, two are more Redo Log files, and one or more Control files.
2. What are the components of Logical database structure of
ORACLE database?
Tablespaces and the Database's Schema Objects.
3. What is a Tablespace?
A database is divided into Logical Storage Unit called
tablespaces. A tablespace is used to grouped related logical structures
together.
4. What is SYSTEM tablespace and When is it Created?
Every ORACLE database contains a tablespace named SYSTEM, which
is automatically created when the database is created. The SYSTEM
tablespace always contains the data dictionary tables for the entire
database.
5. 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.
6. What is schema?
A schema is collection of database objects of a User.
7. What are Schema Objects ?
Schema objects are the logical structures that directly refer to
the database's data. Schema objects include tables, views,
sequences, synonyms, indexes, clusters, database triggers,
procedures, functions packages anddatabase links.
8. Can objects of the same Schema reside in different tablespaces.?
Yes.
9. Can a Tablespace hold objects from different Schemes ?
Yes.
10. 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.
11. 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.)
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