合格させるOracle Database 19c 1Z0-082テスト問題集で[2026年08月28日] 更新された165問あります
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Oracle 1Z0-082 試験、または Oracle Database Administration I 試験は、Oracle データベース管理者としてのキャリアを追求したい個人を対象としています。この試験は、データベースアーキテクチャ、インストールおよび構成、バックアップとリカバリ、セキュリティ管理、データベースパフォーマンスチューニングなど、データベース管理の様々な領域での候補者の知識とスキルを評価します。この試験は、候補者が実世界の環境で Oracle データベース管理に関連するタスクを実行する能力をテストすることを意図しています。
質問 # 24
Which two statements are true about the DUAL table? (Choose two.)
- A. It can be used to display only constants or pseudo columns
- B. It can display multiple rows but only a single column
- C. It can be accessed only by the SYS user
- D. It can be accessed by any user who has the SELECT privilege in any schema
- E. It can display multiple rows and columns
- F. It consists of a single row and single column of VARCHAR2 data type
正解：E、F
解説：
Reference:
https://en.wikipedia.org/wiki/DUAL_table
質問 # 25
Table ORDER_ITEMS contains columns ORDER_ID, UNIT_PRICE and QUANTITY, of data type NUMBER.
Examine these SQL statements:
Statement 1:
SELECT MAX(unit_price * quantity) "Maximum Order"
FROM order_items;
Statement 2:
SELECT MAX(unit_price * quantity) "Maximum Order"
FROM order_items
GROUP BY order_id;
Which two statements are true?
- A. Both statements will return NULL if either UNIT_PRICE or QUANTITY contains NULL.
- B. Both the statements give the same output.
- C. Statement 1 returns only one row of output.
- D. Statement 2 returns only one row of output.
- E. Statement 2 may return multiple rows of output.
正解：C、E
解説：
https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj27781.html
The Expression can contain multiple column references or expressions, but it cannot contain another aggregate or subquery. It must evaluate to a built-in data type. You can therefore call methods that evaluate to built-in data types. (For example, a method that returns a java.lang.Integer or int evaluates to an INTEGER.) If an expression evaluates to NULL, the aggregate skips that value.
質問 # 26
Which two statements are true about space-saving features in an Oracle Database? (Choose two.)
- A. A table that is truncated will always have its segment removed
- B. An index created with the UNUSABLE attribute has no segment
- C. Private Temporary Tables (PTTS) store metadata in memory only
- D. An index that is altered to be UNUSABLE will retain its segment
- E. If they exist for a session, Private Temporary Tables (PTTs) are always dropped at the next COMMIT OR ROLLBACK statement
正解：B、E
質問 # 27
In one of your databases, the user HR has the password HRMGR.
You want to connect to a database instance whose listener listens on port 1531 by using this statement:
CONNECT HR/HRMGR@orcl
No name server is used.
Which statement is true about ORCL?
- A. It must resolve to a valid connect descriptor in the client's tnsnames.ora file
- B. It must be the name of the server running the database to whose instance HR wishes to connect
- C. It must be the value of the SERVICE_NAMES parameter on the client side
- D. It must be the name of the database to whose instance HR wishes to connect
- E. It must resolve to a valid connect descriptor in the server's tnsnames.ora file
正解：B
質問 # 28
Examine this SQL statement:
SELECT cust_id, cust_last_name "Last Name"
FROM customers
WHERE country_id = 10
UNION
SELECT cust_id CUST_NO, cust_last_name
FROM customers
WHERE country_id = 30
Identify three ORDER BY clauses, any one of which can complete the query successfully. (Choose three.)
- A. ORDER BY 2, cust_id
- B. ORDER BY "Last Name"
- C. ORDER BY 2, 1
- D. ORDER BY CUST_NO
- E. ORDER BY "CUST_NO"
正解：A、C、D
質問 # 29
Which three statements are true about GLOBAL TEMPORARY TABLES? (Choose three.)
- A. A DELETE command on a GLOBAL TEMPORARY TABLE cannot be rolled back.
- B. A TRUNCATE command issued in a session causes all rows in a GLOBAL TEMPORARY TABLE for the issuing session to be deleted.
- C. A GLOBAL TEMPORARY TABLE'S definition is available to multiple sessions.
- D. GLOBAL TEMPORARY TABLE space allocation occurs at session start.
- E. GLOBAL TEMPORARY TABLE rows inserted by a session are available to any other session whose user has been granted select on the table.
- F. Any GLOBAL TEMPORARY TABLE rows existing at session termination will be deleted.
正解：B、C、F
解説：
https://docs.oracle.com/javadb/10.8.3.0/ref/rrefdeclaretemptable.html
質問 # 30
You want to write a query that prompts for two column names and the WHERE condition each time it is executed in a session but only prompts for the table name the first time it is executed.
The variables used in your query are never undefined in your session.
Which query can be used?
SELECT &&col1, &&col2
- A. FROM &&table
WHERE &condition;
SELECT &col1, &col2 - B. FROM &table
WHERE &&condition; - C. FROM &table
WHERE '&&condition' = '&cond';
SELECT &&col1, &&col2 - D. FROM &table
WHERE &&condition = &&cond;
SELECT &col1, &col2 - E. FROM "&table"
WHERE &condition;
SELECT '&&col1', '&&col2'
正解：A
質問 # 31
The EMPLOYEES table contains columns EMP_ID of data type NUMBER and HIRE_DATE of data type DATE.
You want to display the date of the first Monday after the completion of six months since hiring.
The NLS_TERRITORY parameter is set to AMERICA in the session and, therefore, Sunday is the first day on the week.
Which query can be used?
- A. SELECT emp_id, ADD_MONTHS(hire_date, 6), NEXT_DAY('MONDAY') FROM employees;
- B. SELECT emp_id, NEXT_DAY(ADD_MONTHS(hire_date, 6), 'MONDAY') FROM employees;
- C. SELECT emp_id, NEXT_DAY(MONTHS_BETWEEN(hire_date, SYSDATE), 6) FROM employees;
- D. SELECT emp_id, NEXT_DAY(ADD_MONTHS(hire_date, 6), 1) FROM employees;
正解：B
質問 # 32
Examine the description of the CUSTOMERS table:
For customers whose income level has a value, you want to display the first name and due amount as 5% of their credit limit. Customers whose due amount is null should not be displayed.
Which query should be used?
- A. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMOUNT FROM customers WHERE cust_income_level != NULL AND cust_credit_level !=NULL;
- B. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMOUNT FROM customers WHERE cust_income_level IS NOT NULL AND cust_credit_limit IS NOT NULL;
- C. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMOUNT FROM customers WHERE cust_income_level != NULL AND due_amount != NULL;
- D. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMOUNT FROM customers WHERE cust_income_level <> NULL AND due_amount <> NULL;
- E. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMOUNT FROM customers WHERE cust_income_level IS NOT NULL AND due_amount IS NOT NULL;
正解：B
質問 # 33
Which three functions are performed by dispatchers in a shared server configuration? (Choose three.)
- A. sending each connection input request to the appropriate shared server input queue
- B. checking for outbound shared server responses on the common outbound response queue
- C. broadcasting shared server session responses back to requesters on all connections
- D. writing inbound request to the common request queue from all shared server connections
- E. receiving inbound requests from processes using shared server connections
- F. sending shared server session responses back to requesters on the appropriate connection
正解：D、E、F
解説：
https://docs.oracle.com/cd/B28359_01/server.111/b28310/manproc001.htm#ADMIN11168
質問 # 34
Your database instance was shut down normally and then started in NOMOUNT state. You then execute this command:
ALTER DATABASE MOUNT;
Which two actions are performed? (Choose two.)
- A. The online data files are opened
- B. The online redo logs are opened
- C. The control file is read
- D. The Oracle background processes are started
- E. The initialization parameter file is read
- F. The alert log records the execution details
正解：C、F
解説：
http://facedba.blogspot.com/2014/07/oracle-database-startup-stages-and.html
質問 # 35
Examine the description of the BOOKS table:
The table has 100 rows.
Examine this sequence of statements issued in a new session:
INSERT INTO books VALUES ('ADV112', 'Adventures of Tom Sawyer', NULL, NULL); SAVEPOINT a; DELETE FROM books; ROLLBACK TO SAVEPOINT a; ROLLBACK; Which two statements are true? (Choose two.)
- A. The first ROLLBACK command restores the 101 rows that were deleted and commits the inserted row
- B. The second ROLLBACK command does nothing
- C. The second ROLLBACK command undoes the insert
- D. The first ROLLBACK command restores the 101 rows that were deleted, leaving the inserted row still to be committed
- E. The second ROLLBACK command replays the delete
正解：A、C
質問 # 36
Which three are true about the Oracle Optimizer? (Choose three.)
- A. It updates stale object statistics in the Data Dictionary.
- B. It can optimize only SELECT statements.
- C. It generates execution plans for SQL statements based on relevant schema objects, system and session parameters, and information found in the Data Dictionary.
- D. It determines the optimal table join order and method.
- E. It can re-optimize execution plans after previous executions detect suboptimal plans.
- F. It will only generate SQL Plan Directives specific to a given SQL statement.
正解：B、C、D
質問 # 37
Which two can you use to recover a dropped table? (Choose two.)
- A. FLASHBACK TABLE TO SCN
- B. FLASHBACK DROP
- C. FLASHBACK TRANSACTION
- D. FLASHBACK QUERY
- E. FLASHBACK DATABASE
正解：A、B
質問 # 38
Which two actions can you perform using DBCA for an existing database?
- A. Create a template that can be used to clone the database.
- B. Create nonstandard block size tablespaces.
- C. Create an additional listener.
- D. Change the character set.
- E. Change the server mode from dedicated to shared, and vice versa.
正解：D、E
質問 # 39
Which two statements are true about the PMON background process? (Choose two.)
- A. It records checkpoint information in the control file
- B. It kills sessions that exceed idle time
- C. It frees unused temporary segments
- D. It registers database services with all local and remote listeners known to the database instance
- E. It frees resources held by abnormally terminated processes
正解：B、E
解説：
Reference:
https://docs.oracle.com/cd/B19306_01/server.102/b14220/process.htm
* Performs process recovery when a user process fails - Cleans up the database buffer cache - Frees resources that are used by the user process * Monitors sessions for idle session timeout
質問 # 40
Which three statements are true about GLOBAL TEMPORARY TABLES? (Choose three.)
- A. A DELETE command on a GLOBAL TEMPORARY TABLE cannot be rolled back.
- B. Any GLOBAL TEMPORARY TABLE rows existing at session termination will be deleted.
- C. A GLOBAL TEMPORARY TABLE'S definition is available to multiple sessions.
- D. GLOBAL TEMPORARY TABLE rows inserted by a session are available to any other session whose user has been granted select on the table.
- E. GLOBAL TEMPORARY TABLE space allocation occurs at session start.
- F. A TRUNCATE command issued in a session causes all rows in a GLOBAL TEMPORARY TABLE for the issuing session to be deleted.
正解：A、D、E
質問 # 41
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