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Real Oracle Database 1Z0-082 Q&A [test]
Table ORDER_ITEMS contains columns ORDER_ID, UNIT_PRICE, and QUANTITY, of data type NUMBER.
Examine these SQL statements:
SELECT MAX(unit_price * quantity) “Maximum Order”
SELECT MAX(unit_price * quantity) “Maximum Order”
GROUP BY order_id;
Which two statements are true?
A. Statement 1 returns only one row of output.
B. Statement 2 returns only one row of output.
C. Both statements will return NULL if either UNIT_PRICE or QUANTITY contains NULL.
D. Both the statements give the same output.
E. Statement 2 may return multiple rows of output.
Correct Answer: AE
The Expression can contain multiple column references or expressions, but it cannot contain another aggregate or
subquery. It must evaluate a built-in data type. You can therefore call methods that evaluate 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.
You execute this command:
CREATE SMALL FILE TABLESPACE sales DATAFILE `/u01/app/oracle/sales01.dbf SIZE 5G SEGMENT SPACE
Which two actions must you take to ensure UNDOTBS01 is used as the default UNDO tablespace? (Choose two.)
A. It must be smaller than the smallest big file tablespace
B. Free space is managed using free lists
C. Any data files added to the tablespace must have a size of 5 gigabytes
D. It uses the database default blocksize E. It is a locally managed tablespace
Correct Answer: DE
Incorrect segment management clause It lets you specify whether Oracle Database should track the used and free
space in the segments in the tablespace using free lists or bitmaps. This clause is not valid for a temporary tablespace.
AUTO: Specify AUTO if you want the database to manage the free space of segments in the tablespace using a bitmap.
MANUAL: Specify MANUAL if you want the database to manage the free space of segments in the tablespace using
E – Correct https://docs.oracle.com/cd/B28359_01/server.111/b28310/tspaces002.htm#ADMIN11360 Create a locally
managed tablespace by specifying LOCAL in the EXTENT MANAGEMENT clause of the CREATE TABLESPACE
statement. This is the default for new permanent tablespaces
D – Correct https://docs.oracle.com/cd/B28359_01/server.111/b28310/create005.htm#ADMIN11105 The most
commonly used block size should be picked as the standard block size. In many cases, this is the only block size that
you need to specify. Typically, DB_BLOCK_SIZE is set to either 4Kor 8K. If you do not set a value for this parameter,
the default data block size is operating system specific.
Your database instance is started with a PFILE. Examine these parameters:
You want to increase the size of the buffer cache.
Free memory is available to increase the size of the buffer cache.
You execute the command:
SQL> ALTER SYSTEM SET DB_CACHE_SIZE=1024M;
What is the outcome?
A. The value is changed only in the PFILE and takes effect at the next instance startup
B. The value is changed for the current instance and in the PFILE
C. It fails because the SCOPE clause is missing
D. Change is applied to the current instance but does not persist after instance restart
Correct Answer: D
The change is applied in memory only, the change does not persist as the database can\’t write to the pfile
The default SCOPE option, when you start the instance using a PFILE, is MEMORY (as well as the only scope option
you can use with a pfile). If scope is omitted the default scope option is used instead. The SCOPE clause is optional and
not mandatory when changing the value of a parameter!
This is wrong, as the pfile is a read-only file for the database so it can\’t writes to it. Changes to the pfile have to be done
manually by changing it directly using f.e. vi on Unix systems.
B is wrong, the same reason as for why answer A is wrong
C is wrong, as mentioned above, when omitted the scope clause defaults to MEMORY when using a pfile.
Not related to that question but the more you know: When starting the database using a spfile you have three options for
the scope (MEMORY, SPFILE, and BOTH). The default value is BOTH.
Examine this command:
CREATE UNDO TABLESPACE undotbs01
Which two actions must you take to ensure UNDOTBS01 is used as the default UNDO tablespace?
A. Add the SEGMENT SPACE MANAGEMENT AUTO clause
B. Set UNDO_TABLESPACE to UNDOTBS01
C. Add the NOLOGGING clause
D. Make certain that the database operates in automatic undo management mode
E. Add the ONLINE clause
Correct Answer: BD
SQL>alter system set undo_management=manual scope=spfile; Bounce instance.
SQL> show parameter undo NAME TYPE VALUE
temp_undo_enabled boolean FALSE
undo_management string MANUAL
undo_retention integer 900
undo_tablespace string UNDOTBS1
SQL> alter system set undo_tablespace=\’UNDOTBS2\’;
alter system set undo_tablespace=\’UNDOTBS2\’
ERROR at line 1:
ORA-02097: parameter cannot be modified because the specified value is invalid
ORA-30014: operation only supported in Automatic Undo Management mode
You want to display the unique promotion costs in each promotion category.
Which two queries can be used? (Choose two.)
A. SELECT promo_cost, promo_category FROM promotions ORDER BY by 1;
B. SELECT DISTINCT promo_cost || \\’ in ` || DISTINCT promo_category FROM promotions ORDER BY 1;
C. SELECT DISTINCT promo_category || ` has ` || promo_cost AS COSTS FROM promotions ORDER BY 1;
D. SELECT promo_category, DISTINCT promo_cost FROM promotions ORDER BY 2;
E. SELECT DISTINCT promo_category, promo_cost FROM promotions ORDER BY 1;
Correct Answer: CE
Which three activities are recorded in the database alert log? (Choose three.)
A. Data Definition Language (DDL) statements
B. non-default database parameters
C. block corruption errors
D. deadlock errors
E. session logins and logouts
Correct Answer: BCD
All internal errors (ORA-600), block corruption errors (ORA-1578), and deadlock errors (ORA-60) that occur The values
of all initialization parameters that had nondefault values at the time the database and instance start
Which three statements are true about inner and outer joins? (Choose three.)
A. A full outer join returns matched and unmatched rows
B. An inner join returns matched rows
C. Outer joins can only be used between two tables per query
D. A full outer join must use Oracle syntax
E. Outer joins can be used when there are multiple join conditions on two tables
F. A left or right outer join returns only unmatched rows
Correct Answer: ABE
E. Outer joins can be used when there are multiple join conditions on two tables can be like the following query:
– select * from table a left join table1 b on a.col1 = b.col1 and a.col2=b.col2;
Examine the description of the PROMOTIONS table:
View the Exhibit and examine the structure of the PRODUCTS table.
Which two tasks require subqueries? (Choose two.)
A. Display the number of products whose PROD_LIST_PRICE is more than the average PROD_LIST_PRICE
B. Display suppliers whose PROD_LIST_PRICE is less than 1000
C. Display products whose PROD_MIN_PRICE is more than the average PROD_LIST_PRICE of all products, and
whose status is orderable
D. Display the total number of products supplied by supplier 102 which have a product status of obsolete
E. Display the minimum PROD_LIST_PRICE for each product status
Correct Answer: AC
You execute this query:
SELECT TO_CHAR(NEXT_DAY(LAST_DAY(SYSDATE), `MON\\’), `dd “Monday for” fmMonth rrrr\\’)
What is the result?
A. It executes successfully but does not return any result
B. It returns the date for the first Monday of the next month
C. It generates an error
D. It returns the date for the last Monday of the current month
Correct Answer: B
select sysdate from dual; 11-09-20 select TO_CHAR(NEXT_DAY(LAST_DAY(SYSDATE),\\’MON\\’),\\’dd “Monday for”
fmMonth rrrr\\’) from dual 05 Monday for October 2020
A script abc.sql must be executed to perform a job.
A database user HR, who is defined in this database, executes this command:
$ sqlplus hr/hr@orcl @abc.sql
What will happen upon execution?
A. The command succeeds and HR will be connected to the orcl and abc.sql databases
B. The command succeeds and HR will be connected to the orcl database instance, and the abc.sql script will be
C. The command fails because the script must refer to the full pathname
D. The command fails and reports an error because @ is used twice
Correct Answer: B
Examine the description of the EMPLOYEES table:
Which query is valid?
A. SELECT dept_id, AVG(MAX(salary)) FROM employees GROUP BY dept_id;
B. SELECT dept_id, join_date, SUM(salary) FROM employees GROUP BY dept_id;
C. SELECT dept_id, join_date, SUM(salary) FROM employees GROUP BY dept_id, join_date;
D. SELECT dept_id, MAX(AVG(salary)) FROM employees GROUP BY dept_id;
Correct Answer: C
Which two statements are true regarding a SAVEPOINT? (Choose two.)
A. Rolling back to a SAVEPOINT can undo a CREATE INDEX statement
B. Rolling back to a SAVEPOINT can undo a TRUNCATE statement
C. Only one SAVEPOINT may be issued in a transaction
D. A SAVEPOINT does not issue a COMMIT
E. Rolling back to a SAVEPOINT can undo a DELETE statement
Correct Answer: DE
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