Managing Databases with Oracle problems
- 1. After a table has been created, its structure can be modified using the SQL command:
Options- A. UPDATE TABLE [TableName].
- B. MODIFY TABLE [TableName].
- C. ALTER TABLE [TableName].
- D. CHANGE TABLE [TableName]. Discuss
Correct Answer: ALTER TABLE [TableName].
- 2. What Oracle backup and recover file contains user and system data?
Options- A. Control file
- B. Datafile
- C. OnLine ReDo file
- D. Offline ReDo file Discuss
Correct Answer: Datafile
- 3. Which statement about sequences is not true?
Options- A. A sequence is an object that generates a sequential series of unique numbers.
- B. Sequences are most often used to provide values for surrogate keys.
- C. NextVal and CurrVal are both sequence methods.
- D. Sequences guarantee valid surrogate key values. Discuss
Correct Answer: Sequences guarantee valid surrogate key values.
- 4. Of the three ways to create an Oracle database, which one is the easiest and most recommended?
Options- A. Using the Oracle Database Configuration Assistant.
- B. Using the Oracle-supplied database creation procedures.
- C. Using the SQL CREATE DATABASE command.
- D. None of the above is correct. Discuss
Correct Answer: Using the Oracle Database Configuration Assistant.
- 5. Which of the following is not true about indexes?
Options- A. Indexes are created to enforce uniqueness on columns.
- B. Indexes are created to enable fast retrieval by column values.
- C. Columns that are frequently used with equal conditions in WHERE clauses are good candidates for indexes.
- D. Indexes are created with the ALTER TABLE command. Discuss
Correct Answer: Indexes are created with the ALTER TABLE command.
- 6. When using SQL*Plus, Oracle commands, column names, table names and all other database elements:
Options- A. are case insensitive.
- B. are case sensitive.
- C. must always be in lower case.
- D. must always be in upper case. Discuss
Correct Answer: are case insensitive.
- 7. You have linked SQL*Plus to an external text editor. To invoke the text editor for use within SQL*Plus, which command do you use?
Options- A. Open [FileName]
- B. Show [FileName]
- C. Alter [FileName]
- D. Edit [FileName] Discuss
Correct Answer: Edit [FileName]
- 8. To see the contents of the SQL*Plus buffer, type:
Options- A. CONTENTS.
- B. BUFFER.
- C. CURRENT.
- D. LIST. Discuss
Correct Answer: LIST.
- 9. What is the type of Oracle backup in which all uncommitted changes have been removed from the datafiles?
Options- A. Full backup
- B. Consistent backup
- C. Inconsistent backup
- D. Differential backup Discuss
Correct Answer: Consistent backup
- 10. Which of the following is not true about modifying table columns?
Options- A. You can drop a column at any time.
- B. You can add a column at any time as long as it is a NULL column.
- C. You can increase the number of characters in character columns or the number of digits in numeric columns
- D. You cannot increase or decrease the number of decimal places. Discuss
Correct Answer: You cannot increase or decrease the number of decimal places.
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