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QUESTION 49
Examine the Load Profile section of an AWR report:
Which two inferences can you derive from the details in this section? (Choose two.)
A. The values for Redo size and Block changes imply that only updates were performed by transactions.
B. The values for Parses (SQL) and Hard parses (SQL) imply that cursor sharing occurred quite often.
C. The values for DB Time and DB CPU imply that the database had a high proportion of idle time during the specified snapshot interval.
D. The values for SQL Work Area and User calls imply that only sort-based operations were performed.
E. The values for Logical reads and Physical reads imply that the number of disk reads per second was less than the total number of DB block reads and consistent gets per second.
Answer: BD
QUESTION 50
Examine the partial TOP 10 Foreground Events by Total Wait Time section of an AWR report:
What should you examine to diagnose the cause of the top three wait events? (Choose the best answer.)
A. the V$ACTIVE_SESSION_HISTORY view
B. the Time Model Statistics section of the AWR report
C. the SQL statements based on elapsed time from the AWR report
D. the Latch Activity section
E. the Segment Statistics section of the AWR report
Answer: E
QUESTION 51
Examine the query and its output:
Which two statements are true? (Choose two.)
A. Session 2832 had to wait 2029 seconds for a message to arrive because of a network bottleneck.
B. Session 4208 is either idle or experiencing poor response time due to a network or resource bottleneck on the client process.
C. Session 3346 is in wait state because it wants to lock a row in a block in which other sessions have already locked rows, and there is no free ITL slot available in this block.
D. Session 3346 is in wait state because either it is waiting to update a row that is locked by another session or another session is trying to insert the same key value in a UNIQUE index.
E. Session 4208 is definitely idle and should be killed to free network resources.
Answer: BD
QUESTION 52
You are administering a database that supports a mixed workload. You upgrade your database from Oracle Database 11g to 12c and after the upgrade, users complain about degraded performance of some queries. The SQL plan baselines imported from the previous version are present for the queries and are loaded to the SQL Management Base as accepted plans. On further investigation, you find that better plans are generated but not used by the optimizer. Examine the parameters set for the instance:
Which three tasks would you perform to improve the performance of these queries? (Choose three.)
A. Gather statistics for the objects used in the queries.
B. Use the DBMS_SPM.EVOLVE_SQL_PLAN_BASELINE function to evolve new plans and fix the plans for the statements.
C. Create an SQL Tuning Set (STS) and run it through the SQL Access Advisor to generate recommendations.
D. Create an STS and run it through the SQL Tuning Advisor to generate recommendations.
E. Set the OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES parameter to TRUE.
F. Use the DBMS_SPM.ALTER_SQL_PLAN_BASELINE function to alter the accepted plans as fixed plans.
Answer: ABC
QUESTION 53
Examine the partial PLAN_TABLE output:
Which is the correct sequence of execution? (Choose the best answer.)
A. 3, 2, 1, 4, 0
B. 0, 1, 2, 3, 4, 1
C. 0, 4, 1, 3, 2, 1
D. 3, 2, 4, 1, 0
E. 3, 2, 4, 1, 0, 2
Answer: A
QUESTION 54
Examine the query and its output:
Which two inferences can be definitely derived from this output? (Choose two.)
A. The db file scattered read event has occurred 104 times in this session for file# 12.
B. The session has completed performing a full table scan.
C. The SQL statements in this session are performing excessive disk reads.
D. The multiblock factor is 8 for this I/O but it could vary for the other I/O events.
Answer: AC
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