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Oracle 1z1-084 Valid Dumps - Latest 1z1-084 Dumps

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Oracle 1Z0-084 Exam is ideal for database administrators, engineers, and architects who want to demonstrate their expertise in performance tuning and management of Oracle Database 19c. 1z1-084 Exam curriculum covers several aspects such as tuning database parameters, optimizing memory usage, optimizing SQL statements, diagnosing and resolving performance issues, and many more. Obtaining the certification requires a thorough knowledge of both theoretical and practical aspects of performance optimization.

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.

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Oracle 1Z0-084 exam is a computer-based test that consists of 60 multiple-choice questions. Candidates have 120 minutes to complete the exam, and they must score at least 63% to pass. 1z1-084 exam fee is $245, and candidates can take the exam at any Pearson VUE testing center worldwide. Oracle recommends that candidates have at least three years of experience in database performance and tuning management before taking 1z1-084 Exam.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q37-Q42):

NEW QUESTION # 37
Which two actions can cause invalidation or loss of one or more results in the SQL Query Result Cache?

A. One or more results were aged out of the result cache.
B. Decreasing the value set for RESULT_CACHE_REMOTE_EXPIRATION.
C. result_cache_max_size is set dynamically to 0.
D. A request was made by the RCBG background of a non-RAC database.
E. 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.

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 # 38
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. Partition index IX_SALES_TIME_ID using hash partitioning.
C. Re-create the SALES table using the columns in IX_SALES_TIME_ID as the hash partitioning key.
D. Re-create the SALES table sorted in order of index IX_SALES_TIME_ID.

Answer: A

Explanation:
Given that index range scan operations on IX_SALES_TIME_ID are 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 using ADVANCED COMPRESSION can 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 the SALES table 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 in IX_SALES_TIME_ID as a hash partitioning key for the SALES 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 # 39
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. A 60% cache hit ratio can be observed for database instances which have very good I/O performance.
B. A 99% cache hit ratio can be observed for database instances which have very poor I/O performance.
C. The buffer cache advisory view v$db_cache_advice provides advice on cache hit ratios appropriate for the instance workload.
D. The performance of workloads that primarily generate full table scans and fast full index scans are always affected by the cache hit ratio.
E. Both the RECYCLE and KEEP buffer caches should always have a very high cache hit ratio.

Answer: B,C

NEW QUESTION # 40
The CURS0R_SHARING and OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES parameters are set to default. The top five wait events in an awr report are due to a large number of hard parses because of several almost identical SQL statements.
Which two actions could reduce the number of hard parses?

A. Create the RECYCLE cache and cache tables accessed by the SQL statements.
B. Set OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES to TRUE.
C. Create the KEEP cache and cache tables accessed by the SQL statements.
D. Increase the size of the library cache.
E. Set the CURSOR_SHARING parameter to FORCE.

Answer: D,E

Explanation:
To reduce the number of hard parses due to several almost identical SQL statements, you can take the following actions:
* C (Correct): Increasing the size of the library cache can help reduce hard parses by providing more memory to store more execution plans. This allows SQL statements to be shared more effectively.
* E (Correct): Setting the CURSOR_SHARING parameter to FORCE will cause Oracle to replace literals in SQL statements with bind variables, which can significantly reduce the number of hard parses by making it more likely that similar SQL statements will share the same execution plan.
The other options do not directly impact the number of hard parses:
* A (Incorrect): Creating the KEEP cache and caching tables accessed by the SQL statements can improve performance for those tables, but it does not directly reduce the number of hard parses.
* B (Incorrect): Creating the RECYCLE cache and caching tables accessed by the SQL statements can make it more likely that objects will be removed from the cache quickly, which does not help with hard parse issues.
* D (Incorrect): Setting OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES to TRUE can help stabilize SQL execution plans but will not reduce the number of hard parses. This parameter is used to automatically capture SQL plan baselines for repeatable SQL statements, which can prevent performance regressions due to plan changes.
References:
* Oracle Database Performance Tuning Guide: Minimizing Hard Parses
* Oracle Database SQL Tuning Guide: CURSOR_SHARING

NEW QUESTION # 41
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$SESSTAT
B. V$SESSION
C. V$SESSION_LONGOPS
D. V$RMAN_BACKUP_JOB_DETAILS

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 # 42
......

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