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Oracle Database 12c: Performance Management and Tuning 1Z0-064 Dumps With VCE and PDF Download (Question 19 - Question 24)


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QUESTION 19
You execute this query twice in a session:
passleader-1z0-064-dumps-191
Then you query V$SQL_SHARED_CURSOR for details about child cursors as shown:
passleader-1z0-064-dumps-192
Which two statements are true? (Choose two.)

A.    No statistics were collected during the first execution of the query.
B.    A subsequent execution of the query in this session is likely to undergo a soft parse.
C.    The second execution of the query was hard parsed because the estimated cardinality was inaccurate.
D.    A subsequent execution of the query in this session will undergo a hard parse.
E.    The second execution of the query was hard parsed because extended statistics were collected after the first execution of the query.

Answer: BC

QUESTION 20
Which two statements are true about the interpretation of Buffer Cache Hit Ratio in the Instance Efficiency Percentages section of an AWR report? (Choose two.)

A.    A high value indicates that the buffer cache is adequately sized for the current workload.
B.    Poor hit ratios indicate that a large number of indexed lookups or small table scans are being performed.
C.    A low hit ratio does not necessarily imply that increasing the size of the buffer cache will improve performance.
D.    A high hit ratio may indicate that repeated scanning of the same large table or index is being performed.
E.    A low hit ratio indicates that a KEEP buffer pool should be configured based on the size of the largest object accessed in the buffer cache.

Answer: CD

QUESTION 21
Your database supports an online transaction processing (OLTP) workload. The database uses ASM storage. One of the ASM disks goes offline because of hardware failure. When the disk is replaced and then added back to the diskgroup, database performance is affected by rebalance operations. Which two actions would you recommend to lower the impact of rebalance operations on the performance of the database? (Choose two.)

A.    Increase the number of ASMB processes.
B.    Decrease the value of the ASM_POWER_LIMIT parameter.
C.    Set the DISK_REPAIR_TIME disk attribute to a lower value.
D.    Specify the POWER clause with a lower value in an ALTER DISKGROUP statement.
E.    Set the DISK_REPAIR_TIME disk attribute to a higher value.

Answer: BD

QUESTION 22
Which two statements are true about Active Session History (ASH)? (Choose two.)

A.    The Data Sample size available in an ASH report is dynamic and, at any given moment, is directly related to the amount of work being performed.
B.    ASH contains sampled data from all sessions that are connected to a database instance at any given moment.
C.    ASH samples data from V$SESSION every second.
D.    An ASH report can be used to identify the service that may be the cause of a transient performance problem.

Answer: AD

QUESTION 23
You are administering a database that supports an OLTP workload. The CURSOR_SHARING parameter is set to EXACT for the instance. The performance of queries issued by one of the modules has degraded. The queries executed by the module are almost identical in syntax. To investigate, you analyze the latest AWR report and find a large number of latch: shared pool wait events and also a high percentage of the hard parse elapsed time. Which two can be reasons for this? (Choose two.)

A.    The I/O performance is slow.
B.    Bind variables are not used for similar queries, causing hard parses.
C.    Repeated access to a small number of blocks.
D.    Excessive time is spent on finding cached cursors in the library cache.
E.    The CURSOR_SHARING parameter is set to EXACT, which does not allow similar queries to share a cursor.

Answer: BE

QUESTION 24
Examine the parameters set for your database instance:
passleader-1z0-064-dumps-241
You notice that for one particular SQL statement, the optimizer generates a new better plan than the plans in the SQL Plan Management Base. Which action is taken by the optimizer? (Choose the best answer.)

A.    It adds the newly generated plan as an accepted but non-fixed plan.
B.    It adds the newly generated plan as enabled and accepted.
C.    It adds the newly generated plan as enabled but not accepted.
D.    It adds the newly generated plan as a fixed plan, which will be used each time the SQL statement is executed.

Answer: B


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