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Free 1z0-064: Oracle Database 12c Performance Management and Tuning Exam Questions and Answers
Last updated: April 1, 2025
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221-1z0-064: Oracle Database 12c Performance Management and Tuning
#Question
What strategy can be used to reduce temp space usage during complex queries?
A.
Increase data redundancy
B.
Use consistent data types
C.
Use hints to optimize joins
D.
Avoid complex joins
Correct Answer:
C
Using hints can optimize how queries are processed, potentially reducing temp space usage during sorting or transformations.
#Question
What can lead to a "high amount of session waits" in Oracle?
A.
Efficient query execution
B.
Low transaction rates
C.
Resource contention on critical resources
D.
Extended CPU utilization
Correct Answer:
C
High session wait events can indicate that multiple sessions are contending for limited resources, slowing overall performance.
#Question
What can the "DBWR" process optimize in Oracle?
A.
User connectivity
B.
Resource paths
C.
Memory fragmentation
D.
Data buffer management
Correct Answer:
D
The Database Writer (DBWR) process optimizes the handling of dirty buffers, flushing them to disk to ensure consistent data.
#Question
Which component does the Data Pump utility primarily rely on?
A.
LOGGING
B.
MEMORY allocation
C.
REUSE_OPTIONS
D.
NETWORK
Correct Answer:
B
The Data Pump utility relies on memory allocation for high-performance exports and imports of data.
#Question
How does using less memory affect query performance?
A.
Reduces contention
B.
Increases the need for disk I/O
C.
Decreases execution time
D.
Improves caching efficiency
Correct Answer:
B
Less memory allocation often requires the database to read more data from disk rather than memory, increasing disk I/O.
#Question
Which SQL command can be used to check the current configuration of the database?
A.
SHOW PARAMETERS
B.
SELECT * FROM V$PARAMETER
C.
SELECT DATABASE
D.
DESCRIBE V$DATABASE
Correct Answer:
B
Selecting from V$PARAMETER reveals various current configuration settings in the Oracle database.
#Question
What does the term "index skew" refer to?
A.
The impact of indexes on performance
B.
Increased database size
C.
Inefficient index structures
D.
An imbalance in data distribution on an indexed column
Correct Answer:
D
Index skew occurs when an index poorly represents the data distribution, leading to inefficient query performance.
221-1z0-064: Oracle Database 12c Performance Management and Tuning
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