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Oracle9i Database Administrator

Oracle Exams Training Describe the contents of the control file

You have decided to permanently remove all the data from the
STUDENT table and you need the table structure in the future. Which single
command performs this?

A. DROP TABLE student;
B. TRUNCATE TABLE student;
C. DELETE* FROM student;
D. TRUNCATE TABLE student KEEP STRUCTURE;
E. DELETE* FROM student KEEP STRUCTURE.

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Answer: B

Explanation:
Answer B is correct because after truncating table you delete all data
and keep table and its structure for future use. Also command TRUNCATE reset
highwatermark level to zero for table.
Incorrect Answers:
A: This DDL operation will drop table and its structure without possibility to rollback
this operation.
C: This operation can be used to perform question task, but it works slowly and usually
used when you need to delete NOT ALL table rows. It does not reset high water mark for
table.
D: Incorrect clause KEEP STRUCTURE inside TRUNCATE TABLE command.
E: Incorrect clause KEEP STRUCTURE inside DELETE command.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 151
Chapter 4: Creating Other Database Objects in Oracle