Managing Databases with Oracle(1st)

Which of the following is not true about indexes?

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Indexes are created to enable fast retrieval by column values.
Columns that are frequently used with equal conditions in WHERE clauses are good candidates for indexes.
Indexes are created to enforce uniqueness on columns.
Indexes are created with the ALTER TABLE command.

The default extension for SQL*Plus is .sql.

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False
True

Which of the following is NOT an Oracle-supported trigger?

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DURING
AFTER
INSTEAD OF
BEFORE

What type of failure occurs when Oracle fails due to an operating system or computer hardware failure?

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Rollback failure
Application failure
Media Failure
Instance Failure

To obtain the structure of an Oracle table, the command to use is:

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DESCRIBE [TableName].
DESC TABLE [TableName].
DESCRIBE STRUCTURE [TableName].
STRUCTURE [TableName].

Of the three ways to create an Oracle database, which one is the easiest and most recommended?

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Using the Oracle Database Configuration Assistant.
Using the SQL CREATE DATABASE command.
None of the above is correct.
Using the Oracle-supplied database creation procedures.

Oracle directly supports the definition of surrogate keys.

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False
True

You can use the DROP statement to remove structures from the database.

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False
True

The only time that case matters is inside quotation marks of strings.

1 Mark(s)

False
True

Indexes are created to enforce uniqueness on columns and to enable fast retrieval by column values.

1 Mark(s)

False
True

Which statement about sequences is not true?

1 Mark(s)

A sequence is an object that generates a sequential series of unique numbers.
NextVal and CurrVal are both sequence methods.
Sequences guarantee valid surrogate key values.
Sequences are most often used to provide values for surrogate keys.

If there is only one statement and no ambiguity about what is wanted, Oracle will treat the semicolon and slash as the same.

1 Mark(s)

False
True

The left-leaning slash tells Oracle to execute whatever statement is in the buffer.

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True
False

What Oracle backup and recover file contains user and system data?

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Control file
Datafile
Offline ReDo file
OnLine ReDo file

You can check on the status of tables with the DESCRIBE or DESC command.

1 Mark(s)

True
False

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?

1 Mark(s)

Edit [FileName]
Alter [FileName]
Show [FileName]
Open [FileName]

When using SQL*Plus, Oracle commands, column names, table names and all other database elements:

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must always be in lower case.
are case insensitive.
are case sensitive.
must always be in upper case.

Oracle allows the ORDER BY clause in view definitions.

1 Mark(s)

False
True

Which of the following is not true about modifying table columns?

1 Mark(s)

You cannot increase or decrease the number of decimal places.
You can increase the number of characters in character columns or the number of digits in numeric columns
You can add a column at any time as long as it is a NULL column.
You can drop a column at any time.

Oracle, the world's most popular DBMS, is powerful and robust, running on many different operating systems.

1 Mark(s)

True
False

Which of the following is not true of SQL views?

1 Mark(s)

Oracle views cannot use the ORDER BY clause in view definitions.
Oracle views can by queried.
Oracle views are created using the standard SQL-92 CREATE VIEW command.
The SQL-92 standard does not allow the use of the ORDER BY clause in view definitions.

In creating a procedure, you may get a message if you have compile errors. Which of the following is true?

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To see the errors, enter SHOW ERRORS in SQL*Plus.
SQL*Plus will automatically show the errors to you.
If there are no syntax errors, you will receive the message 'NO ERRORS.'
The line numbers reported match the line numbers you see in your text editor.

SQL*Plus is a text editor.

1 Mark(s)

True
False

SQL*Plus will finish the statement and execute it when the user types in this:

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A colon ( : ) followed by [Enter].
A left slash ( ) followed by [Enter].
A period ( . ) followed by [Enter].
A semicolon ( ; ) followed by [Enter].

Which prefixes are available to Oracle triggers?

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Both :new and :old
:new only
Neither :new nor :old
:old only

Money is defined in Oracle with the Currency data type.

1 Mark(s)

True
False

When you type Start FILENAME, the statement in your file will be executed automatically.

1 Mark(s)

False
True

An Oracle System Change Number (SCN):

1 Mark(s)

is a value that is incremented whenever a dirty read occurs.
is a value that keeps track of explicit locks.
is a value that is incremented whenever database changes are made.
is incremented whenever a deadlock occurs.

What is the type of Oracle backup in which all uncommitted changes have been removed from the datafiles?

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Consistent backup
Differential backup
Full backup
Inconsistent backup

Sequences guarantee valid surrogate key values.

1 Mark(s)

False
True

After a table has been created, its structure can be modified using the SQL command:

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MODIFY TABLE [TableName].
ALTER TABLE [TableName].
UPDATE TABLE [TableName].
CHANGE TABLE [TableName].

Oracle does NOT support a CASCADE UPDATE constraint.

1 Mark(s)

False
True

When you type into SQL*Plus and press enter, the statement will be finished and executed.

1 Mark(s)

True
False

Oracle maintains a System Change Number (SCN) which is a database-wide value that is incremented by Oracle whenever database changes are made.

1 Mark(s)

False
True

Oracle commands, column names, table names, view names and all other database elements are case sensitive.

1 Mark(s)

True
False

To see the contents of the SQL*Plus buffer, type:

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CONTENTS
LIST
BUFFER
CURRENT

The default extension for an Oracle SQL*Plus file is:

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.ora
.pls
.sql
.txt

Oracle will let you define Notepad as your default editor, and whenever you type NOTEPAD, SQL*Plus will invoke Notepad.

1 Mark(s)

False
True

Which SQL phrase is not supported by Oracle?

1 Mark(s)

ON UPDATE CASCADE
CREATE SEQUENCE [SequenceName]
DROP SEQUENCE [SequenceName]
ON DELETE CASCADE

The semicolon terminates a SQL statement (and executes it).

1 Mark(s)

False
True

Managing Databases with Oracle(1st) : Question 1 of 40