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Earning the Oracle 1Z0-084 certification demonstrates an individual's expertise in performance tuning and management of Oracle Database 19c. It also validates their ability to identify and resolve performance issues, optimize database performance, and improve application efficiency. Oracle Database 19c Performance and Tuning Management certification can enhance an individual's career opportunities and increase their credibility as a database professional.

Oracle 1Z0-084 is a professional-level certification exam offered by Oracle Corporation. 1z1-084 exam is designed to assess the candidate's knowledge and skills in performance tuning and management of Oracle Database 19c. It is intended for professionals who have experience in database administration and want to enhance their skills in performance tuning and management.

The Oracle 1z1-084 Exam covers a wide range of topics related to performance and tuning management. These topics include database performance tuning, performance monitoring, SQL tuning, indexing strategies, and more. Candidates are expected to have a strong understanding of these topics and be able to apply their knowledge to real-world situations.

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q14-Q19):

NEW QUESTION # 14
You execute the following:
EXECUTE DBMS_AuTO_TASK_ADMIN.DISABLE;
Which advisor remains enabled?

A. Automatic SQL Tuning
B. Optimizer Statistics Advisor
C. Automatic Optimizer Statistics Collection
D. SQL Plan Management Evolve Advisor
E. Automatic Segment Advisor

Answer: C

Explanation:
When you executeDBMS_AUTO_TASK_ADMIN.DISABLE, it disables all automated maintenance tasks related to the Auto Task framework. This includes tasks such as the Automatic SQL Tuning Advisor, Automatic Segment Advisor, and others. However, the Automatic Optimizer Statistics Collection (D) remains enabled as it is not part of the Auto Task framework. The gathering of optimizer statistics is controlled separately and is a critical part of the database's self-tuning mechanism to ensure the optimizer has up-to-date information about the data distribution within tables and indexes.
References
* Oracle Database 19c PL/SQL Packages and Types Reference - DBMS_AUTO_TASK_ADMIN
* Oracle Database 19c Database Administrator's Guide - Managing Optimizer Statistics

NEW QUESTION # 15
Which three statements are true about tuning dimensions and details of v$sys_time_model and DB time?

A. The proportion of WAIT TIME to CPU TIME always increases with increased system load.
B. Parse Time Elapsed accounts for successful soft and hard parse operations only.
C. When WAIT TIME is high, instance tuning may improve performance.
D. DB Time accounts for all time used by background processes and user sessions.
E. Systems in which CPU time is dominant need more tuning that those in which WAIT TIME is dominant.
F. Statspack cannot account for high CPU time when CPU TIME is a Top 10 event in DB time. When CPU time is high, SQL tuning may improve performance.

Answer: C,D,F

Explanation:
A: Statspack is a performance diagnostic tool that can help identify high CPU usage issues. High CPU time may indicate that SQL statements need to be tuned for better performance.
D: High wait times can often be reduced by instance tuning, such as adjusting database parameters or improving I/O performance.
F: DB Time is a cumulative time metric that includes the time spent by both user sessions and background processes executing database calls.References:
* Oracle Database Performance Tuning Guide, 19c
* Oracle Database Concepts, 19c

NEW QUESTION # 16
You need to collect and aggregate statistics for the ACCTG service and PAYROLL module, and execute:

Where do you find the output of this command?

A. In $ORACLE_BASE/diag/rdbms/<db unique name>/<instance name>/trace
B. By viewing V$SERV_MOD_ACT_STATS
C. In the current working directory
D. By viewing V$SERVICE_STATS

Answer: B

Explanation:
When you enable statistics gathering for a specific service and module using DBMS_MONITOR.SERV_MOD_ACT_STAT_ENABLE, the output is aggregated and can be viewed using theV$SERV_MOD_ACT_STATSdynamic performance view. This view contains the cumulative statistics of database activity broken down by service and module, which is exactly what you collect when executing the provided command.
* B (Incorrect):While many types of trace files are located in the Diagnostic Destination directory (
$ORACLE_BASE/diag), the aggregated statistics for services and modules are not written to trace files but are instead viewable through dynamic performance views.
* C (Incorrect):TheV$SERVICE_STATSview provides service-level statistics but does not provide the
* combined service/module-level breakdown.
* D (Incorrect):The output of the PL/SQL block is not written to a file in the current working directory; it is stored in the data dictionary and accessible via dynamic performance views.
References:
* Oracle Database PL/SQL Packages and Types Reference:DBMS_MONITOR
* Oracle Database Reference:V$SERV_MOD_ACT_STATS

NEW QUESTION # 17
Which two actions can cause invalidation or loss of one or more results in the SQL Query Result Cache?

A. result_cache_max_size is set dynamically to 0.
B. A request was made by the RCBG background process in a physical standby database that is opened read only and whose primary has a result cache.
C. One or more results were aged out of the result cache.
D. A request was made by the RCBG background of a non-RAC database.
E. Decreasing the value set for RESULT_CACHE_REMOTE_EXPIRATION.

Answer: A,C

Explanation:
The SQL Query Result Cache stores the results of queries and PL/SQL function calls for reuse. However, entries in the result cache can be invalidated or lost under certain conditions:
A: Results can be aged out of the cache when the cache becomes full and new results need to be stored. This process ensures that the cache does not exceed its allocated memory and that it contains the most recently used entries.
B: Setting theRESULT_CACHE_MAX_SIZEparameter to 0 will effectively disable the result cache and all cached results will be lost, as Oracle will no longer allocate any memory to the result cache.
References:
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 18
A database instance is suffering poor I/O performance on two frequently accessed large tables.
No Big Table caching occurs in the database.
Examine these parameter settings:

Which are two actions either one of which will allow Big Table caching to occur?

A. Increasing DB_BIG_TABLE_CACHE_PERCENT_TARGET to at least 25
B. Setting PARALLEL_DEGREE_POLICYAUTO
C. Setting DB_KEEP_CACHE_SIZE to at least 50M
D. Increasing DB_BIG_TABLE_CACHE_PERCENT_TARGET to at least 50
E. Setting PARALLEL_DEGREE_POLICYADAPTIVE
F. Increasing DB_CACHESIZE to 1 G

Answer: A,F

Explanation:
Big Table caching is a feature that allows frequently accessed large tables to be cached in memory to improve I/O performance. From the parameter settings provided, Big Table caching is not occurring because DB_BIG_TABLE_CACHE_PERCENT_TARGETis set to 10, which is the minimum threshold for enabling the feature, but the size of the cache is too small for the big tables to be effectively cached.
To enable Big Table caching, one of the following actions could be taken:
* C (Correct):IncreasingDB_BIG_TABLE_CACHE_PERCENT_TARGETto at least 25. This action would allocate a larger percentage of the buffer cache for storing big tables, which could allow for caching large tables and thus improve I/O performance.
* D (Correct):IncreasingDB_CACHE_SIZEto 1G. Since the size of the buffer cache is a determining factor for how much data can be cached, increasing this parameter would provide more memory space for big tables to be cached.
Options A, B, E, and F will not enable Big Table caching because:
* A:IncreasingDB_BIG_TABLE_CACHE_PERCENT_TARGETto 50 without adjusting the overall size of the cache might still not be sufficient if theDB_CACHE_SIZEis not large enough to hold the big tables.
* B:SettingDB_KEEP_CACHE_SIZEto at least 50M only specifies a separate buffer pool for objects with the KEEP cache attribute and does not affect Big Table caching.
* E:andF:Changing thePARALLEL_DEGREE_POLICYtoADAPTIVEorAUTOinfluences the behavior of parallel execution but does not directly enable or influence Big Table caching.
References:
* Oracle Database Performance Tuning Guide:Big Table Caching
* Oracle Database Reference:DB_BIG_TABLE_CACHE_PERCENT_TARGET
* Oracle Database Reference:DB_CACHE_SIZE

NEW QUESTION # 19
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Oracle Database 19c Performance and Tuning Management Sample Questions (Q14-Q19):

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