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Code d'Examen: 1Z1-054
Nom d'Examen: Oracle (Oracle Database 11g: Performance Tuning)
Questions et réponses: 192 Q&As

Code d'Examen: 1Z1-051
Nom d'Examen: Oracle (Oracle Database: SQL Fundamentals I)
Questions et réponses: 254 Q&As

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NO.1 Which two statements are true regarding the USING and ON clauses in table joins? (Choose two.)
A. Both USING and ON clauses can be used for equijoins and nonequijoins.
B. A maximum of one pair of columns can be joined between two tables using the ON clause.
C. The ON clause can be used to join tables on columns that have different names but compatible data
types.
D. The WHERE clause can be used to apply additional conditions in SELECT statements containing the
ON or the USING clause.
Answer: CD

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NO.2 Which SQL statements would display the value 1890.55 as $1,890.55? (Choose three .)
A. SELECT TO_CHAR(1890.55,'$0G000D00')
FROM DUAL;
B. SELECT TO_CHAR(1890.55,'$9,999V99')
FROM DUAL;
C. SELECT TO_CHAR(1890.55,'$99,999D99')
FROM DUAL;
D. SELECT TO_CHAR(1890.55,'$99G999D00')
FROM DUAL;
E. SELECT TO_CHAR(1890.55,'$99G999D99')
FROM DUAL;
Answer: ADE

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NO.3 Evaluate the following query:
SQL> SELECT promo_name q'{'s start date was }' promo_begin_date
AS "Promotion Launches"
FROM promotions;
What would be the outcome of the above query?
A. It produces an error because flower braces have been used.
B. It produces an error because the data types are not matching.
C. It executes successfully and introduces an 's at the end of each promo_name in the output.
D. It executes successfully and displays the literal " {'s start date was } " for each row in the output.
Answer: C

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NO.4 View the Exhibit and examine the structure of the CUSTOMERS table.
Which two tasks would require subqueries or joins to be executed in a single statement? (Choose two.)
A. listing of customers who do not have a credit limit and were born before 1980
B. finding the number of customers, in each city, whose marital status is 'married'
C. finding the average credit limit of male customers residing in 'Tokyo' or 'Sydney'
D. listing of those customers whose credit limit is the same as the credit limit of customers residing in the
city 'Tokyo'
E. finding the number of customers, in each city, whose credit limit is more than the average credit limit of
all the customers
Answer: DE

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NO.5 You need to produce a report where each customer's credit limit has been incremented by $1000. In
the output, t he customer's last name should have the heading Name and the incremented credit limit
should be labeled New Credit Limit. The column headings should have only the first letter of each word in
uppercase .
Which statement would accomplish this requirement?
A. SELECT cust_last_name Name, cust_credit_limit + 1000
"New Credit Limit"
FROM customers;
B. SELECT cust_last_name AS Name, cust_credit_limit + 1000
AS New Credit Limit
FROM customers;
C. SELECT cust_last_name AS "Name", cust_credit_limit + 1000
AS "New Credit Limit"
FROM customers;
D. SELECT INITCAP(cust_last_name) "Name", cust_credit_limit + 1000
INITCAP("NEW CREDIT LIMIT")
FROM customers;
Answer: C

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NO.6 You need to extract details of those products in the SALES table where the PROD_ID column
contains the string '_D123'.
Which WHERE clause could be used in the SELECT statement to get the required output?
A. WHERE prod_id LIKE '%_D123%' ESCAPE '_'
B. WHERE prod_id LIKE '%\_D123%' ESCAPE '\'
C. WHERE prod_id LIKE '%_D123%' ESCAPE '%_'
D. WHERE prod_id LIKE '%\_D123%' ESCAPE '\_'
Answer: B

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NO.7 View the E xhibit and examine the data in the EMPLOYEES table.
You want to generate a report showing the total compensation paid to each employee to date.
You issue the following query:
SQL>SELECT ename ' joined on ' hiredate
', the total compensation paid is '
TO_CHAR(ROUND(ROUND(SYSDATE-hiredate)/365) * sal + comm)
"COMPENSATION UNTIL DATE"
FROM employees;
What is the outcome?
A. It generates an error because the alias is not valid.
B. It executes successfully and gives the correct output.
C. It executes successfully but does not give the correct output.
D. It generates an error because the usage of the ROUND function in the expression is not valid.
E. It generates an error because the concatenation operator can be used to combine only two items.
Answer: C

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NO.8 View the Exhibit to examine the description for the SALES table.
Which views can have all DML operations performed on it? (Choose all that apply.)
A. CREATE VIEW v3
AS SELECT * FROM SALES
WHERE cust_id = 2034
WITH CHECK OPTION;
B. CREATE VIEW v1
AS SELECT * FROM SALES
WHERE time_id <= SYSDATE - 2*365
WITH CHECK OPTION;
C. CREATE VIEW v2
AS SELECT prod_id, cust_id, time_id FROM SALES
WHERE time_id <= SYSDATE - 2*365
WITH CHECK OPTION;
D. CREATE VIEW v4
AS SELECT prod_id, cust_id, SUM(quantity_sold) FROM SALES
WHERE time_id <= SYSDATE - 2*365
GROUP BY prod_id, cust_id
WITH CHECK OPTION;
Answer: AB

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NO.9 Which three statements are true regarding the data types in Oracle Database 10g/11g? (Choose
three.)
A. Only one LONG column can be used per table.
B. A TIMESTAMP data type column stores only time values with fractional seconds.
C. The BLOB data type column is used to store binary data in an operating system file.
D. The minimum column width that can be specified for a VARCHAR2 data type column is one.
E. The value for a CHAR data type column is blank-padded to the maximum defined column width.
Answer: ADE

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NO.10 Examine the structure of the SHIPMENTS table:
name Null Type
PO_ID NOT NULL NUMBER(3)
PO_DATE NOT NULL DATE
SHIPMENT_DATE NOT NULL DATE
SHIPMENT_MODE VARCHAR2(30)
SHIPMENT_COST NUMBER(8,2)
You want to generate a report that displays the PO_ID and the penalty amount to be paid if the
SHIPMENT_DATE is later than one month from the PO_DATE. The penalty is $20 per day.
Evaluate the following two queries:
SQL> SELECT po_id, CASE
WHEN MONTHS_BETWEEN (shipment_date,po_date)>1 THEN
TO_CHAR((shipment_date - po_date) * 20) ELSE 'No Penalty' END PENALTY
FROM shipments;
SQL>SELECT po_id, DECODE
(MONTHS_BETWEEN (po_date,shipment_date)>1,
TO_CHAR((shipment_date - po_date) * 20), 'No Penalty') PENALTY
FROM shipments;
Which statement is true regarding the above commands?
A. Both execute successfully and give correct results.
B. Only the first query executes successfully but gives a wrong result.
C. Only the first query executes successfully and gives the correct result.
D. Only the second query executes successfully but gives a wrong result.
E. Only the second query executes successfully and gives the correct result.
Answer: C

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NO.11 View the Exhibit and examine the structure of the PRODUCTS table.
All products have a list price.
You issue the following command to display the total price of each product after a discount of 25% and a
tax of 15% are applied on it. Freight charges of $100 have to be applied to all the products.
SQL>SELECT prod_name, prod_list_price -(prod_list_price*(25/100))
+(prod_list_price -(prod_list_price*(25/100))*(15/100))+100
AS "TOTAL PRICE"
FROM products;
What would be the outcome if all the parenthese s are removed from the above statement?
A. It produces a syntax error.
B. The result remains unchanged.
C. The total price value would be lower than the correct value.
D. The total price value would be higher than the correct value.
Answer: B

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NO.12 View the Exhibit and examine the structure of the PRODUCTS table.
You need to generate a report in the following format:
CATEGORIES
5MP Digital Photo Camera's category is Photo
Y Box's category is Electronics
Envoy Ambassador's category is Hardware
Which two queries would give the required output? (Choose two.)
A. SELECT prod_name q'''s category is ' prod_category CATEGORIES
FROM products;
B. SELECT prod_name q'['s ]'category is ' prod_category CATEGORIES
FROM products;
C. SELECT prod_name q'\'s\' ' category is ' prod_category CATEGORIES
FROM products;
D. SELECT prod_name q'<'s >' 'category is ' prod_category CATEGORIES
FROM products;
Answer: CD

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NO.13 View the Exhibit and examine the structure of the SALES, CUSTOMERS, PRODUCTS, and TIMES
tables.
The PROD_ID column is the foreign key in the SALES table, which references the PRODUCTS table.
Similarly, the CUST_ID and TIME_ID columns are also foreign keys in the SALES table referencing the
CUSTOMERS and TIMES tables, respectively.
Evaluate the following CREATE TABLE command:
CREATE TABLE new_sales(prod_id, cust_id, order_date DEFAULT SYSDATE)
AS
SELECT prod_id, cust_id, time_id
FROM sales;
Which statement is true regarding the above command?
A. The NEW_SALES table would not get created because the DEFAULT value cannot be specified in the
column definition.
B. The NEW_SALES table would get created and all the NOT NULL constraints defined on the specified
columns would be passed to the new table.
C. The NEW_SALES table would not get created because the column names in the CREATE TABLE
command and the SELECT clause do not match.
D. The NEW_SALES table would get created and all the FOREIGN KEY constraints defined on the
specified columns would be passed to the new table.
Answer: B

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NO.14 View the Exhibit and examine the data in the CUSTOMERS table.
Evaluate the following query:
SQL> SELECT cust_name AS "NAME", cust_credit_limit/2 AS MIDPOINT,MIDPOINT+100 AS "MAX
LOWER LIMIT"
FROM customers;
The above query produces an error on execution.
What is the reason for the error?
A. An alias cannot be used in an expression.
B. The a lias NAME should not be enclosed with in double quotation marks .
C. The MIDPOINT+100 expression gives an error because CUST_CREDIT_LIMIT contains NULL
values.
D. The a lias MIDPOINT should be enclosed with in double quotation marks for the
CUST_CREDIT_LIMIT/2 expression .
Answer: A

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NO.15 Which two statements are true regarding single row functions? (Choose two.)
A. They a ccept only a single argument.
B. They c an be nested only to two levels.
C. Arguments can only be column values or constants.
D. They a lways return a single result row for every row of a queried table.
E. They c an return a data type value different from the one that is referenced.
Answer: DE

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NO.16 Which statement is true regarding the INTERSECT operator?
A. It ignores NULL values.
B. Reversing the order of the intersected tables alters the result.
C. The names of columns in all SELECT statements must be identical.
D. The number of columns and data types must be identical for all SELECT statements in the query.
Answer: D

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NO.17 Using the CUSTOMERS table, you need to generate a report that shows 50% of each credit
amount in each income level. The report should NOT show any repeated credit amounts in each income
level.
Which query would give the required result?
A. SELECT cust_income_level, DISTINCT cust_credit_limit * 0.50
AS "50% Credit Limit"
FROM customers;
B. SELECT DISTINCT cust_income_level, DISTINCT cust_credit_limit * 0.50
AS "50% Credit Limit"
FROM customers;
C. SELECT DISTINCT cust_income_level ' ' cust_credit_limit * 0.50
AS "50% Credit Limit"
FROM customers;
D. SELECT cust_income_level ' ' cust_credit_limit * 0.50 AS "50% Credit Limit"
FROM customers;
Answer: C

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NO.18 View the Exhibit; e xamine the structure of the PROMOTIONS table.
Each promotion has a duration of at least seven days .
Your manager has asked you to generate a report, which provides the weekly cost for each promotion
done to l date.
Which query would achieve the required result?
A. SELECT promo_name, promo_cost/promo_end_date-promo_begin_date/7
FROM promotions;
B. SELECT promo_name,(promo_cost/promo_end_date-promo_begin_date)/7
FROM promotions;
C. SELECT promo_name, promo_cost/(promo_end_date-promo_begin_date/7)
FROM promotions;
D. SELECT promo_name, promo_cost/((promo_end_date-promo_begin_date)/7)
FROM promotions;
Answer: D

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NO.19 Evaluate the following query:
SELECT INTERVAL '300' MONTH,
INTERVAL '54-2' YEAR TO MONTH,
INTERVAL '11:12:10.1234567' HOUR TO SECOND
FROM dual;
What is the correct output of the above query?
A. +25-00 , +54-02, +00 11:12:10.123457
B. +00-300, +54-02, +00 11:12:10.123457
C. +25-00 , +00-650, +00 11:12:10.123457
D. +00-300 , +00-650, +00 11:12:10.123457
Answer: A

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NO.20 Examine the structure of the PROMOTIONS table:
name Null Type
PROMO_ID NOT NULL NUMBER(6)
PROMO_NAME NOT NULL VARCHAR2(30)
PROMO_CATEGORY NOT NULL VARCHAR2(30)
PROMO_COST NOT NULL NUMBER(10,2)
The management wants to see a report of unique promotion costs in each promotion category.
Which query would achieve the required result?
A. SELECT DISTINCT promo_cost, promo_category FROM promotions;
B. SELECT promo_category, DISTINCT promo_cost FROM promotions;
C. SELECT DISTINCT promo_cost, DISTINCT promo_category FROM promotions;
D. SELECT DISTINCT promo_category, promo_cost FROM promotions ORDER BY 1;
Answer: D

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Code d'Examen: 1Z1-054
Nom d'Examen: Oracle (Oracle Database 11g: Performance Tuning)
Questions et réponses: 192 Q&As

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NO.1 You plan to use adaptive thresholds as part of the performance tuning activity. You decide to increase
the window size of the default moving window baseline for all metric observations and comparisons in
your database. The following error occurs when you try to increase the window size through Enterprise
Manager:
Failed to commit: ORA-13541: system moving window baseline size (1296000) greater than retention
(1036800) ORA-06512: at "SYS.DBMS_WORKLOAD_REPOSITORY", line 601 ORA-06512: at line 2
Which action would allow you to perform the preceding task successfully?
A. increasing the flashback retention period
B. increasing the retention period for SQL Management Base
C. increasing the undo retention period for the database instance
D. increasing the Automatic Workload Repository (AWR) retention period
ANSWER: D

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NO.2 View Exhibit1 to examine the description of the CUSTOMERS table.
You observed that optimizer selectivity is not accurate when the CUST_STATE_PROVINCE and
COUNTRY_ID columns are used together in the WHERE clause of a query.
View Exhibit2 to examine the query execution plan and the commands executed to gather the statistics.
The optimizer predicts that 20 rows will be processed rather than the 3,341 rows, which is the actual
number of rows returned from the table.
What can you do to make the optimizer detect the actual number of rows?
A. Set the STATISTICS_LEVEL parameter to ALL.
B. Set the OPTIMIZER_USE_PENDING_STATISTICS parameter to FALSE.
C. Create extended statistics for the CUST_STATE_PROVINCE and COUNTRY_ID columns.
D. Increase the STALE_PERCENT value for the CUSTOMERS table by using the
DBMS_STATS.SET_TABLE_PREFS procedure.
ANSWER: C

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NO.3 View Exhibit1 to examine the description of the CUSTOMERS table.
The CUSTOMERS table has been updated heavily today. In a frequently used SQL statement, you notice
that estimated rows and the actual number of rows fetched differ greatly. The COUNTRY_ID column has
an index.
View Exhibit2 and examine the query execution plan.
What would you recommend to improve the optimizer's estimation?
A. setting the STATISTICS_LEVEL parameter to ALL
B. setting the OPTIMIZER_USE_PENDING_STATISTICS parameter to FALSE
C. creating extended statistics for the CUST_LAST_NAME, CUST_ID, and CUST_TOTAL columns
D. updating the statistics for the CUSTOMERS table by using the
DBMS_STATS.GATHER_TABLE_STATS
procedure
ANSWER: D

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NO.4 You are working on an online transaction processing (OLTP) system. You detected free buffer waits
events for your database instance running in a machine that has multiple CPUs. You increased the
database buffer cache size as the first step. After a few hours of work on the database, further
investigation shows that the same event is being recorded.
What would be your next step to avoid this event in future?
A. Decrease the value of the DBWR_IO_SLAVES parameter.
B. Set the USE_INDIRECT_DATA_BUFFERS parameter to TRUE.
C. Increase the value of the DB_WRITER_PROCESSES parameter.
D. Increase the value of the DB_FILE_MULTIBLOCK_READ_COUNT parameter.
ANSWER: C

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NO.5 You observed that some of the queries are performing poorly on the SALES_RECORDS table in your
database.
On further investigation, you find that at the end of each day the contents of the SALES_RECORDS table
are transferred to the SALES table and deleted from the SALES_RECORDS table. The deleted
operations cause the table to be sparsely populated.
You decided to use the ALTER TABLE...SHRINK SPACE COMPACT command to shrink the table.
Why would you choose this method? (Choose all that apply.)
A. because it can be used during peak hours
B. because it avoids unnecessary cursor invalidation
C. because it adjusts the high-water mark (HWM) immediately
D. because you have long-running queries that might span the shrink operation
E. because it does not allow any data manipulation language (DML) operations, thereby making the
shrink
operation faster
ANSWER: ABD

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NO.6 You are working on an online transaction processing (OLTP) system. By day most of the application
users perform queries accessing the most recently added or modified rows. The applications have most
of the queries based on multiple tables. But at night, some batch processing is also done.
Which two actions would you recommend to choose a goal for the optimizer based on the needs of your
application? (Choose two.)
A.setting the OPTIMIZER_MODE parameter to ALL_ROWS at the instance level
B.setting the OPTIMIZER_MODE parameter to FIRST_ROWS_n at the instance level
C.asking the developer to add a hint /*ALL_ROWS*/ in the long-running batch processing queries
D.asking the developer to add a hint /*FIRST_ROWS_n*/ in the long-running batch processing queries
ANSWER: BC

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NO.7 After running SQL Performance Analyzer (SPA), you observe a few regressed SQL statements in the
SPA output. Identify the two actions that you would suggest for these regressed SQL statements.
(Choose two.)
A.Running SQL Access Advisor
B.Adding them to SQL Plan Baseline
C.Submitting them to SQL Tuning Advisor
D.Running Automatic Database Diagnostic Monitor (ADDM)
ANSWER: BC

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NO.8 Examine the initialization parameter values for the instance given below:
NAME TYPE VALUE
------------------------------------ ----------- ------------------
optimizer_capture_sql_plan_baselines boolean FALSE
optimizer_dynamic_sampling integer 2
optimizer_features_enable string 11.1.0.6
optimizer_index_caching integer 0
optimizer_index_cost_adj integer 100
optimizer_mode string ALL_ROWS
db_file_multiblock_read_count integer 64
The index created on the column used in the WHERE clause of the query. You notice that the query is not
using the index. Instead of an index scan, a full table scan is used.
View the Exhibit and examine the autotrace output for a query.
What could be the reason for it? (Choose all that apply.)
A. The OPTIMIZER_INDEX_COST_ADJ initialization parameter has a low value.
B. The DB_FILE_MULTIBLOCK_READ_COUNT initialization parameter has a low value.
C. The statistics for the table and all the indexes associated with the table are not current.
D. The table has less than DB_FILE_MULTIBLOCK_READ_COUNT blocks under the high-water mark.
ANSWER: CD

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NO.9 View Exhibit1 and examine the indexes on the CUSTOMERS table.
The statistics for the CUSTOMERS table have been updated recently by using the following command:
SQL> EXEC DBMS_STATS.GATHER_TABLE_STATS('SH','CUSTOMERS',method_opt=>'FOR ALL
INDEXED COLUMNS SIZE AUTO');
View Exhibit2 to examine a query plan. Even though the index is present on the COUNTRY_ID and
CUST_GENDER columns, the query uses a full table scan. What could be the reason?
A. because the histogram statistics for the COUNTRY_ID column are not updated
B. because the DB_FILE_MULTIBLOCK_READ_COUNT initialization parameter is set to a high value
C. because the optimizer calculates the cost of accessing blocks by using a full table scan to be less as
compared to index scans, even though indexes are available
D. because indexes on CUST_GENDER and COUNTRY_ID columns are of different types, the index on
the CUST_GENDER column is bitmap index, and on COUNTRY_ID columns is btree index.
ANSWER: C

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NO.10 You work as a DBA for a company and you have the responsibility of managing one of its online
transaction processing (OLTP) systems. The database encountered performance-related problems and
you generated an Automatic Workload Repository (AWR) report to investigate it further.
View the Exhibits and examine the AWR report.
What could be the problem in this database?
A.Java pool is not configured.
B.The CPU in the system is slow.
C.The shared pool size is inadequate.
D.The database buffer cache is inadequate.
E.The OPEN_CURSORS parameter is set to a small value.
ANSWER: C

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NO.11 View the Exhibit and examine a portion of the output obtained from the following query:
SQL> SELECT * FROM v$sys_time_model;
Select three correct interpretations of the time model statistics. (Choose three.)
A. DB time includes the wait time of all the nonidle and idle user sessions.
B. SQL execute elapsed time includes the time spent in performing fetches of query results.
C. DB CPU includes the CPU time spent on database user-level calls and background CPU time.
D. SQL execute elapsed time includes components of the hard parse elapsed time like bind elapsed time.
E. DB time includes the connection management call elapsed time excluding the background process
time.
ANSWER: BDE

Oracle   1Z1-054   1Z1-054   1Z1-054   1Z1-054

NO.12 Which three factors influence the optimizer's behavior while choosing an optimization approach and
goal for a SQL statement? (Choose three.)
A.parsing of a SQL statement
B.operating system (OS) statistics
C.object statistics in the data dictionary
D.the OPTIMIZER_MODE initialization parameter
E.optimizer SQL hints for changing the query optimizer goal
ANSWER: CDE

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NO.13 You are working on a development database that was upgraded to Oracle Database 11g from Oracle
Database 9i. An ADDM finding in this database says that the shared pool is inadequately sized, as shown
in the Exhibit.
You diagnosed that this is due to different kinds of workloads and this occurs only during peak hours. You
tried to resize this by shrinking the database buffer cache but that caused inadequate buffer cache
problems. The following are the related parameter settings:
SQL> show parameter sga
NAME TYPE VALUE
------------------------------ --------------- -----------------
lock_sga boolean FALSE
pre_page_sga boolean FALSE
sga_max_size big integer 300M
sga_target big integer 0
SQL> show parameter target
NAME TYPE VALUE
------------------------------ --------------- -----------------
.....
fast_start_mttr_target integer 0
memory_max_target big integer 0
memory_target big integer 0
pga_aggregate_target big integer 100M
sga_target big integer 0
You want to balance the memory between the System Global Area (SGA) components within SGA
without affecting the size of the Program Global Area (PGA).
Which action would solve this problem?
A. Set the SGA_TARGET parameter to 300M.
B. Set the SGA_MAX_SIZE parameter to 400M.
C. Set the MEMORY_TARGET parameter to 100M.
D. Set the MEMORY_MAX_TARGET parameter to 300M.
ANSWER: A

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NO.14 A batch workload that historically completed in the maintenance window between 10:00 PM and
midnight is currently showing poor performance and completing at 2 AM.
To help in the diagnosis of the performance degradation, the senior DBA in your organization asks you to
execute the awrddrpt.sql script to produce a Compare Periods report.
Which two statements are true about the report produced by this script? (Choose two.)
A. It is refreshed automatically based on the moving window baseline.
B. It compares details between any two selected time periods of the same duration.
C. It normalizes the statistics by the amount of time spent on the database for each time period.
D. It compares details between two consecutive time periods of the same or different durations and is
refreshed every 60 minutes.
ANSWER: BC

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NO.15 A user in a session executed the following SQL statement to set the optimizer mode:
ALTER SESSION SET OPTIMIZER_MODE = ALL_ROWS
What impact would it have on the goal of the optimizer for that session? (Choose all that apply.)
A. Statement level OPTIMIZER_MODE hints take precedence over the session-level setting.
B. The OPTIMIZER_MODE parameter set at instance level takes precedence over the session-level
value.
C. The optimizer uses a cost-based approach, regardless of the presence of statistics; it optimizes with a
goal of best response time.
D. The optimizer uses a cost-based approach for all SQL statements in the session, regardless of the
presence of statistics; it optimizes with a goal of best throughput.
ANSWER: AD

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NO.16 View the Exhibit exhibit1 to examine the series of SQL commands and parameter settings.
View the Exhibit exhibit2 to examine the plans available in the SQL plan baseline.
The first plan (in red) is created when OPTIMIZER_MODE is set to ALL_ROWS and the second plan (in
blue) is created when OPTIMIZER_MODE is set to FIRST_ROWS.
Which SQL plan baseline would be used if the SQL query in exhibit1 is executed again when the value of
OPTIMIZER_MODE is set to FIRST_ROWS?
A. the second plan, because it is a fixed plan
B. the first plan, because it is an accepted plan
C. the second plan, because it is the latest generated plan in FIRST_ROW mode
D. A new plan, because the second plan in FIRST_ROW mode is not an accepted plan
ANSWER: B

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NO.17 You are working on a decision support system (DSS). The index is available on the COUNTRY_ID
column of the CUSTOMERS table.
View the Exhibit and examine the parameter settings and the query execution plan.
Why is the query using a full table scan instead of an index scan?
A. because the histogram statistics for the COUNTRY_ID column are not updated
B. because the index statistics for the index on the COUNTRY_ID column are not current
C. because the DB_FILE_MULTIBLOCK_READ_COUNT initialization parameter is set to a higher value
D. because the optimizer predicts that most of the blocks in the table are accessed. Therefore, it uses a
full table scan, even though indexes are available.
ANSWER: D

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NO.18 Examine the initialization parameter values for the instance given below:
NAME TYPE VALUE
------------------------------------ ----------- ------------------
optimizer_capture_sql_plan_baselines boolean FALSE
optimizer_dynamic_sampling integer 2
optimizer_features_enable string 11.1.0.6
optimizer_index_caching integer 0
optimizer_index_cost_adj integer 100
optimizer_mode string ALL_ROWS
db_file_multiblock_read_count integer 64
You notice that the one of the queries is using a full table scan (view Exhibit1) instead of index unique
scan (view Exhibit2). The index is present on the column that is accessed in the WHERE clause of the
query. The cost for a full table scan is more than that for an index unique scan.
Why would the optimizer choose full table scan over index unique scan? (Choose all that apply.)
A. The OPTIMIZER_INDEX_COST_ADJ initialization parameter is set to a low value.
B. The OPTIMIZER_INDEX_COST_ADJ initialization parameter is set to a high value.
C. The DB_FILE_MULTIBLOCK_READ_COUNT initialization parameter is set to a low value.
D. The statistics for the table and all the indexes associated with the table are not current.
ANSWER: BD

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NO.19 The columns CUST_CITY, CUST_STATE_PROVINCE, and COUNTRY_ID are frequently used
together in the WHERE clause of the queries. The CUSTOMERS table is a big table with 20 GB of data.
You notice that the selectivity for these three columns varies from the selectivity that the optimizer
calculates.
What would you recommend to influence the selectivity calculated by the optimizer?
A. creating function-based indexes by concatenating all the columns
B. updating histogram statistics for these columns by using the DBMS_STATS.GATHER_TABLE_STATS
procedure
C. using the DBMS_STATS.CREATE_EXTENDED_STATS function to create a virtual column and create
index on the virtual column
D. using the DBMS_STATS.CREATE_EXTENDED_STATS function to create a virtual column and the
DBMS_STATS.GATHER_TABLE_STATS procedure to collect statistics on the virtual column
ANSWER: D

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NO.20 Identify two correct statements about the Active Session History (ASH) data. (Choose two.)
A.A part of SGA memory is used to store ASH data as rolling buffer.
B.The ASH data can be analyzed between any two small time intervals.
C.All ASH data in memory are flushed to disk by MMON in every 3 seconds.
D.All ASH data in memory are flushed to disk by MMNL process whenever the buffer is full.
ANSWER: AB

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