EXAM 1Z1-084 PAPERS, 1Z1-084 RELIABLE DUMPS BOOK

Exam 1z1-084 Papers, 1z1-084 Reliable Dumps Book

Exam 1z1-084 Papers, 1z1-084 Reliable Dumps Book

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Oracle 1Z0-084 certification is a valuable credential for professionals working with Oracle Database 19c. It demonstrates their expertise in managing and optimizing database performance, which is a critical aspect of maintaining a reliable and efficient database infrastructure. By earning this certification, candidates can enhance their career prospects and demonstrate their commitment to professional development and excellence.

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q34-Q39):

NEW QUESTION # 34
Which three types of statistics are captured by statspack with snap level 6?

  • A. Parent and child latches
  • B. Parent and child latches
  • C. Enqueue statistics
  • D. Plan usage data
  • E. Segment-level statistics
  • F. Optimizer execution plans

Answer: A,C,E

Explanation:
Statspack is a performance diagnostic tool provided by Oracle prior to the introduction of the Automatic Workload Repository (AWR). At snap level 6, Statspack captures the following types of statistics:
* A (Correct):Parent and child latches are captured. Latch statistics provide information about contention for latches, which are low-level serialization mechanisms used by Oracle.
* E (Correct):Enqueue statistics, which provide information on the waits for locks that manage the concurrency between users.
* F (Correct):Segment-level statistics, which provide detailed information on database segments such as tables, indexes, etc., to identify I/O and contention issues.
* C (Incorrect):While optimizer execution plans are an essential aspect of performance tuning, detailed execution plan capture is not part of the Statspack report at level 6.
* D (Incorrect):Plan usage data refers to how frequently a plan is being used, which is more associated with AWR and not typically captured in Statspack reports.
References:
* Oracle Database Performance Tuning Guide:Using Statspack


NEW QUESTION # 35
This error occurred more than four hours ago in the database:
ORA-04036 PGA memory used by the instance exceeds PGA_AGGREGATE_LIMIT
You want to know which process and query were at fault.
Which two views should you use for this purpose?

  • A. DBA_HIST_SQLSTAT
  • B. DBA_HIST_PROCESS_MEM_SUMMARY
  • C. DBA_HIST_PGASTAT
  • D. DBA_HIST_SQLTEXT
  • E. DBA_HIST_ACTIVE_SESS_HISTORY

Answer: B,E

Explanation:
To investigate the cause of the ORA-04036 error, which indicates that PGA memory usage exceeds the PGA_AGGREGATE_LIMIT, the appropriate views to consult are DBA_HIST_ACTIVE_SESS_HISTORY and DBA_HIST_PROCESS_MEM_SUMMARY.
* DBA_HIST_ACTIVE_SESS_HISTORY: This view provides historical information about active sessions in the database. It includes details about the SQL executed, the execution context, and the resources consumed by each session. By examining this view, you can identify the specific sessions and SQL queries that were active and potentially consuming excessive PGA memory around the time the ORA-04036 error occurred.
* DBA_HIST_PROCESS_MEM_SUMMARY: This view contains historical summaries of memory usage by processes. It can help in identifying the processes that were consuming a significant amount of PGA memory, leading to the ORA-04036 error. This view provides aggregated memory usage information over time, making it easier to pinpoint the processes responsible for high PGA memory consumption.
Together, these views offer a comprehensive overview of the memory usage patterns and specific queries or processes that might have contributed to exceeding the PGA_AGGREGATE_LIMIT, resulting in the ORA-
04036 error.
References:
* Oracle Database Reference: DBA_HIST_ACTIVE_SESS_HISTORY
* Oracle Database Reference: DBA_HIST_PROCESS_MEM_SUMMARY
* Oracle Database Performance Tuning Guide: Managing Memory


NEW QUESTION # 36
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. Re-create the SALES table.
  • B. Partition the SALES table.
  • C. Increase PCTFREE for the SALES table.
  • D. Compress the SALES table.
  • E. Coalesce all sales table indexes.

Answer: B,D

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 # 37
What is the right time to stop tuning an Oracle database?

  • A. When the I/O is less than 10% of the DB time
  • B. When the allocated budget for performance tuning has been exhausted
  • C. When the buffer cache and library cache hit ratio is above 95%
  • D. When all the concurrency waits are eliminated from the Top 10

Answer: B

Explanation:
The right time to stop tuning an Oracle database is often determined by the point of diminishing returns - when the cost of further tuning (in terms of time, resources, or money) exceeds the performance benefits gained.
This is often related to the budget allocated for performance tuning.
* A (Correct):When the allocated budget for performance tuning has been exhausted, it may be time to stop tuning unless the benefits of further tuning justify requesting additional budget.
* B (Incorrect):Eliminating all concurrency waits from the Top 10 is an unrealistic goal since some waits are inevitable and can occur due to application design, which might not be possible to eliminate completely.
* C (Incorrect):The buffer cache and library cache hit ratio being above 95% does not necessarily indicate that the database is fully optimized. Hit ratios are not reliable indicators of database performance and should not be used as sole criteria to end tuning efforts.
* D (Incorrect):Having I/O less than 10% of DB time is not a definitive indicator to stop tuning. It is essential to consider the overall performance goals and whether they have been met rather than focusing solely on I/O metrics.
References:
* Oracle Database Performance Tuning Guide:Introduction to Performance Tuning
* Oracle Database 2 Day + Performance Tuning Guide:Understanding the Tuning Process


NEW QUESTION # 38
Which two statements are true about session wait information contained in v$session or v$session_wait?

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

Answer: B,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 # 39
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