1Z0-064 Questions and Answers

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Oracle Database 12c: Performance Management and Tuning: 1Z0-064

Rating: 4.5

Vendor: Oracle

Certifications: Oracle Database

Exam Name: Oracle Database 12c: Performance Management and Tuning

Exam Code: 1Z0-064

Total Questions: 119 Q&As

Last Updated: Jun 20, 2022

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1Z0-064 Online Practice Questions and Answers

Questions 1

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.

Show Answer
Questions 2

You are administering a database that supports a mixed workload. The CURSOR_SHARING parameter is set to the default value. While analyzing the latest

Automatic Workload Repository (AWR) report, you find a large number of cursor:

pin S wait on X, cursor: pin X wait on S, and library cache mutex waits in the Top 10 foreground events section. Examine the Instance Efficiency Percentages

section in the AWR report:

Which three statements are true in this scenario? (Choose three.)

A. Sessions are waiting for mutexes in share mode on cursors but other sessions are holding the mutexes in exclusive mode.

B. The CPU is spending more time in finding cursors in the library cache.

C. Cursors are not getting shared, resulting in a large number of hard parses.

D. Sessions are waiting for mutexes in exclusive mode on cursors but other sessions are holding the mutexes in share mode.

E. The buffers required by queries are not found in the buffer cache, thereby increasing expensive disk I/O.

Show Answer
Questions 3

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.

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