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Quiz 2025 Reliable Oracle Actual 1Z0-084 Test Answers

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Oracle is a globally recognized corporation that is responsible for several innovative IT solutions. Its flagship product, the Oracle database, has revolutionized the way organizations store, manage and retrieve data since its inception. With the latest release of Oracle Database 19c, it is now possible to optimize, manage and enhance the performance of databases with greater ease and effectiveness. One of the emerging areas of knowledge and expertise related to Oracle databases is performance and tuning management, which is now covered by the 1Z0-084 Oracle exam.

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Oracle 1Z0-084 Exam is a certification program designed for professionals who have expertise in managing performance and tuning Oracle Database 19c. 1Z0-084 exam is ideal for database administrators, developers, and other IT professionals who are responsible for managing large-scale databases. The 1Z0-084 exam covers topics such as performance tuning, SQL tuning, resource management, and diagnosing performance problems. Oracle Database 19c Performance and Tuning Management certification exam is designed to test the candidate's proficiency in analyzing and optimizing database performance, troubleshooting common issues, and implementing best practices.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q43-Q48):

NEW QUESTION # 43
You must write a statement that returns the ten most recent sales. Examine this statement:

Users complain that the query executes too slowly. Examine the statement's current execution plan:

What must you do to reduce the execution time and why?

A. Replace the FETCH FIRST clause with ROWNUM to enable the use of an index on SALES.
B. Create an index on SALES.CUST_ID to force an INDEX RANGE SCAN on this index followed by a NESTED LOOP join between CUSTOMERS and SALES.
C. Enable Adaptive Plans so that Oracle can change the Join method as well as the Join order for this query.
D. Create an index on SALES.TIME_ID to force the return of rows in the order specified by the ORDER BY clause.
E. Collect a new set of statistics on PRODUCT, CUSTOMERS, and SALES because the current stats are inaccurate.

Answer: D

Explanation:
The execution plan shows a full table access for the SALES table. To reduce the execution time, creating an index on SALES.TIME_ID would be beneficial as it would allow the database to quickly sort and retrieve the most recent sales without the need to perform a full table scan, which is I/O intensive and slower. By indexing TIME_ID, which is used in the ORDER BY clause, the optimizer can take advantage of the index to efficiently sort and limit the result set to the ten most recent sales.
* B (Incorrect): Replacing FETCH FIRST with ROWNUM would not necessarily improve the performance unless there is an appropriate index that the optimizer can use to avoid sorting the entire result set.
* C (Incorrect): There is no indication that the current statistics are inaccurate; hence, collecting new statistics may not lead to performance improvement.
* D (Incorrect): While adaptive plans can provide performance benefits by allowing the optimizer to adapt the execution strategy, the main issue here is the lack of an index on the ORDER BY column.
* E (Incorrect): Creating an index on SALES.CUST_ID could improve join performance but would not address the performance issue caused by the lack of an index on the ORDER BY column.
References:
* Oracle Database SQL Tuning Guide: Managing Indexes
* Oracle Database SQL Tuning Guide: Using Indexes and Clusters

NEW QUESTION # 44
Which two statements are true about disabling Automatic Shared Memory Management (ASMM)?

A. Both SGA_TARGET and SGA_MAX_SIZE must be set to zero.
B. It requires a database instance restart to take effect.
C. All SGA components retain their current sizes at the time of disabling.
D. All SGA components excluding fixed SGA and other internal allocations are readjusted immediately after disabling ASMM.
E. All auto-tuned SGA components are reset to their original user-defined values.
F. The SGA size remains unaffected after disabling ASMM.

Answer: C,F

Explanation:
When ASMM is disabled, the sizes of the automatically managed SGA components remain at their current values. ASMM is controlled by the SGA_TARGET parameter. If SGA_TARGET is set to a non-zero value, ASMM is enabled and Oracle will automatically manage the sizes of the various SGA components. When ASMM is disabled, by setting SGA_TARGET to zero, the SGA components that were automatically sized will retain their current sizes rather than being reset to their original user-defined values. The overall size of the SGA remains the same unless manually changed by modifying individual component sizes or SGA_MAX_SIZE.
References:
* Oracle Database Administration Guide, 19c
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 45
Examine this code block, which executes successfully:
DBMS_SERVER_ALERT. SET_THRESHOLD (
DBMS_SERVER_ALERT.CPU_TIME_PER_CALL, DBMS_SERVER_ALERT. OPERATOR_GE, '8000', DBMS_SERVER_ALERT.OPERATOR_GE, '10000', 1, 2, 'inst1', DBMS_SERVER_ALERT.OBJECT_TYPE_SERVICE, 'main.regress.rdbms.dev.us.example.com') ;

What will happen?

A. A warning alert will be issued when CPU time exceeds 1 minute for each user call.
B. A warning alert will be issued only when CPU time exceeds 10000 microseconds for each user call.
C. A critical alert will be issued when CPU time exceeds 10000 microseconds for each user call.
D. A critical alert will be issued when CPU time exceeds 2 minutes for each user call.

Answer: C

Explanation:
In the provided code block, the DBMS_SERVER_ALERT.SET_THRESHOLD procedure is used to set alert thresholds for the CPU time per call in Oracle Database. This procedure is a part of Oracle's Database Server Alert system, which monitors various metrics and generates alerts when certain thresholds are exceeded.
The parameters passed to the SET_THRESHOLD procedure are as follows:
* The first parameter DBMS_SERVER_ALERT.CPU_TIME_PER_CALL specifies the metric for which the threshold is being set, in this case, the CPU time consumed per database call.
* The second and third parameters DBMS_SERVER_ALERT.OPERATOR_GE and '8000' specify the warning threshold level and its value, respectively. However, these are not relevant to the answer as they are overridden by the critical threshold settings.
* The fourth and fifth parameters DBMS_SERVER_ALERT.OPERATOR_GE and '10000' set the critical threshold level and its value. This means that a critical alert will be generated when the CPU time per call exceeds 10000 microseconds.
* The remaining parameters specify the warning and critical alert intervals, the instance name, the object type, and the service name. These are not directly relevant to the behavior described in the options.
Thus, the correct answer is B, as the critical threshold for CPU time per call is set to 10000 microseconds, and the system is configured to issue a critical alert when this threshold is exceeded.
References:
* Oracle Database 19c documentation on the DBMS_SERVER_ALERT.SET_THRESHOLD procedure, which details the parameters and usage of this procedure for setting alert thresholds within Oracle Database monitoring system.
* Oracle Database Performance Tuning Guide, which provides best practices and methodologies for monitoring and tuning Oracle Database performance, including the use of server alerts and thresholds.

NEW QUESTION # 46
Accessing the SALES tables causes excessive db file sequential read wait events.
Examine this AWR except:

Now, examine these attributes displayed by querying dba_tables:

Finally, examine these parameter settings:

Which two must both be used to reduce these excessive waits?

A. Increase PCTFREE for the SALES table.
B. Re-create the SALES table.
C. Compress the SALES table.
D. Coalesce all sales table indexes.
E. Partition the SALES table.

Answer: C,E

Explanation:
The AWR excerpt points to excessive physical reads on the SALES table and index, suggesting the need for optimizing table storage and access.
Partitioning the SALES table (A) can reduce 'db file sequential read' waits by breaking down the large SALES table into smaller, more manageable pieces. This can localize the data and reduce the I/O necessary for query operations.
Compressing the SALES table (D) can also help reduce I/O by minimizing the amount of data that needs to be read from disk. This can also improve cache utilization and reduce the 'db file sequential read' waits.
References:
* Oracle Database VLDB and Partitioning Guide, 19c
* Oracle Database Administrator's Guide, 19c
These changes are recommended based on Oracle's best practices for managing large tables and reducing I/O waits, ensuring better performance and efficiency.

NEW QUESTION # 47
Which two statements are true about session wait information contained in v$session or v$session_wait?

A. Rows for sessions that are not waiting might contain the actual wait time for the last event for which they waited.
B. Rows for sessions that are currently waiting have their wait time incremented every microsecond.
C. Rows for sessions that are not waiting always contain the total wait time since the session started.
D. Rows for sessions displaying WAITED UNKNOWN TIME in the STATE column indicate that the session is still waiting.
E. Rows for sessions that are currently waiting have a wait time of 0.

Answer: A,E

Explanation:
In theV$SESSIONview, Oracle provides information about the session waits:
B: When theWAIT_TIMEcolumn has a value of 0, it signifies that the session is currently waiting for a resource. This column represents the duration of the current or last wait.
C: If the session is not actively waiting, theWAIT_TIMEcolumn shows the time the session spent waiting for the last wait event. If theSTATEcolumn is showing "WAITED KNOWN TIME", it means the session is not currently waiting, but it indicates the time for which it had waited.
References:
* Oracle Database Reference, 19c
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 48
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