1Z0-084 ACCURATE PREP MATERIAL, 1Z0-084 ANSWERS REAL QUESTIONS

1Z0-084 Accurate Prep Material, 1Z0-084 Answers Real Questions

1Z0-084 Accurate Prep Material, 1Z0-084 Answers Real Questions

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Oracle 1Z0-084 (Oracle Database 19c Performance and Tuning Management) Certification Exam is an excellent platform for database administrators, developers, and performance analysts who want to strengthen their knowledge and expertise in the database performance tuning arena. Oracle Database 19c Performance and Tuning Management certification exam helps to validate the candidates’ skills and knowledge regarding database tuning and optimization methodologies used in the Oracle Database. Earning this certification opens various career opportunities, and it serves as an endorsement of the professional competency and credibility of the certified candidates.

Oracle 1Z0-084 (Oracle Database 19c Performance and Tuning Management) Certification Exam is a highly sought-after certification exam for those who want to specialize in performance tuning and management of Oracle Database 19c. Oracle Database 19c Performance and Tuning Management certification exam is designed to test the candidate's knowledge and skills in managing and tuning the performance of an Oracle Database 19c. 1Z0-084 exam covers a wide range of topics including performance tuning methodology, database architecture, SQL tuning, memory management, and more.

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q45-Q50):

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

Answer: A

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
Database performance has degraded recently.
index range scan operations on index ix_sales_time_id are slower due to an increase in buffer gets on sales table blocks.
Examine these attributes displayed by querying DBA_TABLES:

Now, examine these attributes displayed by querying DBA_INDEXES:

Which action will reduce the excessive buffer gets?

  • A. Re-create index IX_SALES_TIME_ID using ADVANCED COMPRESSION.
  • B. Re-create the SALES table sorted in order of index IX_SALES_TIME_ID.
  • C. Partition index IX_SALES_TIME_ID using hash partitioning.
  • D. Re-create the SALES table using the columns in IX_SALES_TIME_ID as the hash partitioning key.

Answer: A

Explanation:
Given that index range scan operations onIX_SALES_TIME_IDare slower due to an increase in buffer gets, the aim is to improve the efficiency of the index access. In this scenario:
* B (Correct):Re-creating the index usingADVANCED COMPRESSIONcan reduce the size of the index, which can lead to fewer physical reads (reduced I/O) and buffer gets when the index is accessed, as more of the index can fit into memory.
The other options would not be appropriate because:
* A (Incorrect):Re-creating theSALEStable sorted in order of the index might not address the issue of excessive buffer gets. Sorting the table would not improve the efficiency of the index itself.
* C (Incorrect):Using the columns inIX_SALES_TIME_IDas a hash partitioning key for theSALES table is more relevant to data distribution and does not necessarily improve index scan performance.
* D (Incorrect):Hash partitioning the index is generally used to improve the scan performance in a parallel query environment, but it may not reduce the number of buffer gets in a single-threaded query environment.
References:
* Oracle Database SQL Tuning Guide:Managing Indexes
* Oracle Database SQL Tuning Guide:Index Compression


NEW QUESTION # 47
Examine these commands, which execute successfully:

Which statement is true?

  • A. AD DM is enabled for all pluggable databases.
  • B. AWR- snapshots in all pluggable databases will be purged automatically after every 60 mins.
  • C. AWR snapshots can be purged manually in pluggable databases.
  • D. ADDM, AWR, and ASH reports can be purged automatically.

Answer: C

Explanation:
The DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS procedure allows
setting attributes related to AWR snapshots. While the interval setting controls the frequency of snapshot generation, purging them is a separate process that can be managed either automatically (with retention settings) or manually.References:
* Oracle Database PL/SQL Packages and Types Reference, 19c
* Oracle Multitenant Administrator's Guide, 19c


NEW QUESTION # 48
An Oracle 19c database uses default values for all optimizer initialization parameters.
After a table undergoes partition maintenance, a large number of wait events occur for:
cursor: pin S wait on X
Which command reduces the number of these wait events?

  • A. ALTER SYSTEM SET CURSOR_SPACE_FOR_TIME - TRUE;
  • B. ALTER SYSTEM SET CURSOR_INVALIDATION = DEFERRED;
  • C. ALTER SYSTEM SET SESSION CACHED CURSORS = 500;
  • D. ALTER SYSTEM SET CURSOR_SHARING = FORCE;

Answer: B

Explanation:
Thecursor: pin S wait on Xwait event suggests contention for a cursor pin, which is associated with mutexes (a type of locking mechanism) that protect the library cache to prevent concurrent modifications. This issue can often be alleviated by deferring the invalidation of cursors until the end of the call to reduce contention.
The correct command to use would be:
* C (Correct):ALTER SYSTEM SET CURSOR_INVALIDATION=DEFERRED;This setting defers the invalidation of dependent cursors until the end of the PL/SQL call, which can reduce thecursor: pin S wait on Xwait events.
The other options are incorrect in addressing this issue:
* A (Incorrect):SettingCURSOR_SHARINGtoFORCEmakes the optimizer replace literal values with bind variables. It doesn't address the contention for cursor pins directly.
* B (Incorrect):CURSOR_SPACE_FOR_TIME=TRUEaims to reduce the parsing effort by keeping cursors for prepared statements open. It may increase memory usage but does not directly resolve cursor: pin S wait on Xwaits.
* D (Incorrect):IncreasingSESSION_CACHED_CURSORScaches more session cursors but doesn't necessarily prevent the contention indicated by thecursor: pin S wait on Xwait events.
References:
* Oracle Database Reference:CURSOR_INVALIDATION
* Oracle Database Performance Tuning Guide:Reducing Cursor Invalidation


NEW QUESTION # 49
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_ACTIVE_SESS_HISTORY
  • B. DBA_HIST_SQLSTAT
  • C. DBA_HIST_SQLTEXT
  • D. DBA_HIST_PROCESS_MEM_SUMMARY
  • E. DBA_HIST_PGASTAT

Answer: A,D

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 # 50
......

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