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Free PDF 2025 Latest Oracle 1z1-084 Test Labs

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To pass the Oracle 1Z0-084 exam, candidates must have a deep understanding of Oracle Database 19c architecture and its associated components. They should be able to identify and resolve performance issues using tools such as SQL Tuning Advisor, Automatic Workload Repository, and Oracle Enterprise Manager. Candidates should also be proficient in monitoring database performance and tuning system parameters to optimize database performance. Successful completion of the Oracle 1Z0-084 exam demonstrates a candidate's ability to manage and tune Oracle Database 19c systems effectively, making them a valuable asset to any organization that relies on Oracle Database technology.

Oracle 1Z0-084 exam is a comprehensive test comprising 80 multiple-choice questions that need to be completed within 120 minutes. 1z1-084 Exam is designed to challenge candidates’ expertise in Oracle Database performance tuning, and it includes questions on a wide range of topics, such as query optimization, automatic database tuning, parallel operations, optimizer statistics management, and Oracle Database Resource Manager.

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

NEW QUESTION # 34
You are informed that the RMAN session that is performing the database duplication is much slower than usual. You want to know the approximate time when the rman operation will be completed.
Which view has this information?

A. V$RMAN_BACKUP_JOB_DETAILS
B. V$SESSION
C. V$SESSION_LONGOPS
D. V$SESSTAT

Answer: C

Explanation:
In Oracle Database, theV$SESSION_LONGOPSview provides insights into various operations within the database that are expected to take more than six seconds to complete. These include operations related to RMAN (Recovery Manager), such as database duplication tasks. This view displays information about the progress of these long-running operations, including the start time, elapsed time, and estimated time to completion.
When an RMAN session is performing a database duplication and is observed to be slower than usual, checking theV$SESSION_LONGOPSview can give an approximation ofwhen the RMAN operation might complete. This view includes fields likeTIME_REMAININGandELAPSED_SECONDSthat help in estimating the completion time of the operation based on its current progress.
References:
* Oracle Database Reference:V$SESSION_LONGOPS
* Oracle Database Backup and Recovery User's Guide:Monitoring RMAN Jobs

NEW QUESTION # 35
Which two statements are true about the use and monitoring of Buffer Cache Hit ratios and their value in tuning Database I/O performance?

A. The performance of workloads that primarily generate full table scans and fast full index scans are always affected by the cache hit ratio.
B. The buffer cache advisory view v$db_cache_advice provides advice on cache hit ratios appropriate for the instance workload.
C. A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.
D. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.
E. A 60% cache hit ratio can be observed for database instances which have very good I/O performance.

Answer: B,C

Explanation:
A high buffer cache hit ratio typically indicates that the database is effectively using the buffer cache and does not often need to read data from disk. However, this metric alone is not a reliable indicator of the I/O performance of the database for several reasons:
* Full table scans and fast full index scans (A) can bypass the buffer cache by design if the blocks are not deemed reusable shortly, which can impact the cache hit ratio.
* A high cache hit ratio (B) can be misleading if the database performance is poor due to other factors, such as inefficient queries or contention issues.
* The buffer cache advisory (C) is a more valuable tool for understanding the potential impact of different cache sizes on the database's I/O performance. It simulates scenarios with different cache sizes and provides a more targeted recommendation.
* The RECYCLE and KEEP buffer caches (D) are specialized caches designed for certain scenarios.
While high hit ratios can be beneficial, they are not universally required; some workloads might not be significantly impacted by lower hit ratios in these caches.
* A lower cache hit ratio (E) does not necessarily mean poor I/O performance. In some cases, a system with a well-designed storage subsystem and efficient queries might perform well even with a lower cache hit ratio.
References
* Oracle Database 19c Performance Tuning Guide - Buffer Cache Hit Ratio
* Oracle Database 19c Performance Tuning Guide - v$db_cache_advice

NEW QUESTION # 36
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 $ORACLE_BASE/diag/rdbms/<db unique name>/<instance name>/trace
B. In the current working directory
C. By viewing V$SERV_MOD_ACT_STATS
D. By viewing V$SERVICE_STATS

Answer: C

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 # 37
For which two actions can SQL Performance Analyzer be used to assess the impact of changes to SQL performance?

A. changes to database initialization parameters
B. operating system upgrades
C. operating system and hardware migrations
D. storage, network, and interconnect changes
E. database consolidation for pluggable databases (PDBs)

Answer: A,E

Explanation:
SQL Performance Analyzer (SPA) can be used to assess the impact of different types of changes on SQL performance. These changes can include database initialization parameters, which can significantly affect how SQL statements are executed and therefore their performance. SPA allows you to capture a workload before and after the change and compare the performance of each SQL statement.
Database consolidation, including moving to pluggable databases (PDBs), can also affect SQL performance.
SPA can analyze the SQL workload to see how consolidation impacts performance, by comparing metrics such as elapsed time and CPU time before and after the consolidation.
References:
* Oracle Database SQL Tuning Guide, 19c
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 38
Examine these commands, which execute successfully:

Which statement is true?

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

Answer: B

Explanation:
TheDBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGSprocedure 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 # 39
......

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