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1Z0-064 Exam Questions & Answers

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1Z0-064 Exam Questions & Answers

Vendor: Oracle

Certifications: Oracle Certifications

Exam Code: 1Z0-064

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

Updated: Jun 27, 2025

Q&As: 119 ( View Details)

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1Z0-064 Online Practice Questions and Answers

Questions 1

For which two requirements can you always use the V$ACTIVE_SESSION_HISTORY view? (Choose two.)

A. to investigate intermittent performance problems in a session, only when the problem lasted less than five minutes in the last twelve hours

B. to find the exact number of executions of a specific query in a session in the last two minutes

C. to identify which module in an application was being executed in a session

D. to identify a scheduler job that is not responding

E. to find the amount of Program Global Architecture (PGA) memory being currently consumed by a session

Show Answer
Questions 2

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 3

Your database supports an OLTP system.

Examine the parameter values configured in your database:

The CUSTOMERS table contains 8,000 rows. The CUST_ID column is the primary key and the COUNTRY_ID column contains only three possible values: 1111, 2222, and 3333.

You execute the commands:

SQL> EXECUTE DBMS_STATS.GATHER_TABLE_STATS(`SH',`CUSTOMERS');

PL/SQL procedure successfully completed.

SQL> CREATE INDEX COUNTRY_IDX ON CUSTOMERS (COUNTRY_ID);

Index created.

You then perform a series of INSERT, UPDATE, and DELETE operations on the table.

View the Exhibit to examine the query and its execution plan.

Which three options would improve the performance of the query? (Choose three.)

A. creating a bitmap index on the COUNTRY_ID column

B. regathering statistics on the CUSTOMERS table

C. creating a histogram on the COUNTRY_ID column

D. increasing the size of the PGA

E. creating a SQL profile

F. creating a KEEP cache

Show Answer More Questions

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