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IT Certifications · 1Z0-006

Oracle Database Foundations Exam Practice Test

The Oracle Database Foundations Exam practice page covers introductory relational database concepts and basic Oracle SQL. The available questions sample table structure, schemas, date-and-time data types, indexes, joins, data dictionary views, transactions, the DUAL table, and triggers—useful foundations for understanding how database objects organize and expose data.

Exam overview

Exam providerOracle
Exam code1Z0-006
CategoryIT Certifications

About the Oracle Database Foundations Exam

Foundational database work involves relating logical structures to the information they hold. A row represents a record, while columns define its attributes; schemas organize objects in relation to database users. SQL skills include recognizing statements that change table definitions and interpreting joins that preserve unmatched rows. Other useful distinctions include what a composite index stores, how to identify tables available through data dictionary views, and why transaction durability matters after a failure. Understanding Oracle-specific features such as the DUAL table and triggers helps explain how queries can return values and how database actions can initiate associated behavior. These concepts support reading simple database scenarios, choosing suitable structures, and understanding how data access and changes are represented.

Sample Practice Questions

Review a selection from this exam's published US Practice Tests practice bank.

Question 1

Which data type is generally appropriate for storing a calendar date and time in Oracle Database?

  1. ADATE
  2. BNUMBER
  3. CRAW
  4. DBLOB
Show answerCorrect answer: A

Oracle's DATE data type stores date and time components to whole-second precision. NUMBER stores numeric values, RAW stores binary data, and BLOB is intended for large binary objects.

Question 2

What does the Oracle Database concept of a schema refer to in relation to a user?

  1. AA collection of objects owned by that user
  2. BA set of network routes to the database
  3. CA copy of the database stored for recovery
  4. DA group of background processes
Show answerCorrect answer: A

An Oracle schema is the collection of database objects owned by a particular user, such as tables, views, and procedures. It is not a physical database copy or a network configuration.

Question 3

What does a COMPOSITE index in Oracle Database contain?

  1. AIndex entries based on more than one table column
  2. BA stored copy of every table row in sorted order
  3. COnly the values from a single fixed system column
  4. DA set of database user passwords
Show answerCorrect answer: A

A composite index is defined on multiple columns, and its entries are organized using those indexed column values. It is not a complete table copy or a security credential store.

Question 4

Which SQL statement changes the definition of an existing table, such as adding a column?

  1. AALTER TABLE
  2. BUPDATE TABLE
  3. CREPLACE TABLE
  4. DMODIFY ROW
Show answerCorrect answer: A

ALTER TABLE is the data definition language statement used to change a table's structure, including adding or modifying columns and constraints. UPDATE changes data values in rows rather than the table definition.

Question 5

Which Oracle data dictionary view lists tables accessible to the current user, including tables owned by other users when privileges allow access?

  1. AUSER_TABLES
  2. BALL_TABLES
  3. CDBA_TABLES
  4. DV$TABLES
Show answerCorrect answer: B

ALL_TABLES describes relational tables accessible to the current user. USER_TABLES is limited to tables owned by that user, while DBA_TABLES is a broader administrative view that generally requires appropriate privileges. V$ views report dynamic instance performance information and V$TABLES is not the standard view for this purpose.

Question 6

Which join returns rows from the left table even when no matching row exists in the right table?

  1. AINNER JOIN
  2. BCROSS JOIN
  3. CLEFT OUTER JOIN
  4. DNATURAL JOIN
Show answerCorrect answer: C

A LEFT OUTER JOIN preserves every row from its left input. Where no matching right-side row exists, the right-side columns in the result are null. An inner join returns only matching rows; a cross join forms combinations of rows.

Question 7

Which transaction property means that committed changes remain durable after a database failure, subject to the configured recovery capabilities?

  1. AAtomicity
  2. BConsistency
  3. CIsolation
  4. DDurability
Show answerCorrect answer: D

Durability is the ACID property concerned with preserving committed changes. Atomicity concerns all-or-nothing transactions, consistency concerns valid states, and isolation concerns interactions among concurrent transactions.

How to use this practice test

Access the free practice bank to answer up to 20 randomly selected questions in a session. After completing it, review the results to identify which concepts need more attention, such as SQL statements, relational structures, or Oracle-specific features. The bank contains 50 published questions.

Preparation tips

  • Compare DATE and other Oracle date-and-time types by the information each can represent, including time components.
  • Practice distinguishing schemas, users, tables, columns, and rows; explain how each relates to stored data.
  • Write small examples using ALTER TABLE and left outer joins, then predict the resulting structure or rows.
  • Review what composite indexes contain and how data dictionary views differ in the objects they expose.
  • Trace a simple transaction from change to commit, and relate durability to recovery after database failure.
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