2025 1Z0-084–100% FREE MOCK EXAMS | EXCELLENT RELIABLE 1Z0-084 TEST SAMPLE

2025 1Z0-084–100% Free Mock Exams | Excellent Reliable 1Z0-084 Test Sample

2025 1Z0-084–100% Free Mock Exams | Excellent Reliable 1Z0-084 Test Sample

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To achieve the Oracle 1Z0-084 certification, candidates must pass a 120-minute exam consisting of 80 multiple-choice questions. 1Z0-084 exam covers topics such as performance tuning fundamentals, SQL tuning, memory management, and database resource management. Candidates must have a deep understanding of Oracle Database 19c architecture, configuration, and management to pass the exam.

Oracle 1Z0-084 exam is designed to evaluate the skills and knowledge of database administrators and developers in performance and tuning management using Oracle Database 19c. 1Z0-084 Exam is ideal for professionals who are looking to enhance their skills in performance tuning and management of Oracle databases. Passing the 1Z0-084 exam demonstrates an individual's proficiency in managing and optimizing database performance, which is a crucial aspect of maintaining efficient and effective database systems.

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Oracle 1Z0-084 Certification Exam is an excellent way for database professionals to demonstrate their expertise in performance and tuning management. By passing 1Z0-084 exam, candidates can prove to potential employers that they possess the knowledge and skills needed to manage and optimize Oracle Database 19c performance. Additionally, earning this certification can lead to career advancement opportunities and higher salaries.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q51-Q56):

NEW QUESTION # 51
Which three statements are true about server-generated alerts?

  • A. They may contain suggestions for correcting the identified problems.
  • B. They are notifications from the Oracle Database Server of an existing or impending problem.
  • C. Their threshold settings can be modified by using DBMS_SERVER_ALERT.
  • D. They provide notifications but never any suggestions for correcting the identified problems.
  • E. They are logged in the alert log.
  • F. They can be viewed only from the Cloud Control Database home page.

Answer: A,B,E

Explanation:
Server-generated alerts in Oracle Database are designed to notify DBAs and other administrators about issues within the database environment. These alerts can be triggered by a variety of conditions, including threshold-based metrics and specific events such as ORA- error messages. Here's how these options align with the statements provided:
* A (True):Server-generated alerts are indeed notifications from the Oracle Database Server that highlight existing or impending issues. These alerts are part of Oracle's proactive management capabilities, designed to inform administrators about potential problems before they escalate.
* C (True):These alerts are logged in the alert log of the Oracle Database. The alert log is a crucial diagnostic tool that records major events and changes in the database, including server-generated alerts.
This log is often the first place DBAs look when troubleshooting database issues.
* F (True):Server-generated alerts may include suggestions for correcting identified problems. Oracle Database often provides actionable advice within these alerts to assist in resolving issues more efficiently. These suggestions can range from adjusting configuration parameters to performing specific maintenance tasks.
Options B, D, and E do not accurately describe server-generated alerts:
* B (False):While the statement might have been true in some contexts, Oracle's server-generated alerts often include corrective suggestions, making this statement incorrect.
* D (False):Server-generated alerts can be viewed from various interfaces, not just the Cloud Control Database home page. They are accessible through Enterprise Manager, SQL Developer, and directly within the database alert log, among other tools.
* E (False):While it's true that threshold settings for some alerts can be modified, the method specified, usingDBMS_SERVER_ALERT, is not correct. Threshold settings are typically adjusted through Enterprise Manager or by modifying specific initialization parameters directly.
References:
* Oracle Database Documentation:Oracle Database 19c: Performance Management and Tuning
* Oracle Base: Alert Log and Trace Files
* Oracle Support:Understanding and Managing Server-Generated Alerts


NEW QUESTION # 52
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_SHARING = FORCE;
  • B. ALTER SYSTEM SET SESSION CACHED CURSORS = 500;
  • C. ALTER SYSTEM SET CURSOR_SPACE_FOR_TIME - TRUE;
  • D. ALTER SYSTEM SET CURSOR_INVALIDATION = DEFERRED;

Answer: D

Explanation:
The cursor: pin S wait on X wait 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 the cursor: pin S wait on X wait events.
The other options are incorrect in addressing this issue:
* A (Incorrect): Setting CURSOR_SHARING to FORCE makes the optimizer replace literal values with bind variables. It doesn't address the contention for cursor pins directly.
* B (Incorrect): CURSOR_SPACE_FOR_TIME=TRUE aims 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 X waits.
* D (Incorrect): Increasing SESSION_CACHED_CURSORS caches more session cursors but doesn't necessarily prevent the contention indicated by the cursor: pin S wait on X wait events.
References:
* Oracle Database Reference: CURSOR_INVALIDATION
* Oracle Database Performance Tuning Guide: Reducing Cursor Invalidation


NEW QUESTION # 53
Which two actions can cause invalidation or loss of one or more results in the SQL Query Result Cache?

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

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 # 54
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 # 55
During which application lifecycle phase do you take baselines?

  • A. Production
  • B. Migration or upgrade
  • C. Design and development
  • D. Deployment
  • E. Testing

Answer: A

Explanation:
Baselines are typically taken during the production phase of the application lifecycle. They provide a snapshot of performance metrics under normal operating conditions which can be used for comparison against future performance. Baselines are essential for understanding how the system performs under its typical workload and for detecting deviations from this expected performance over time, especially after changes like migrations, upgrades, or significant changes in user activity.
References
* Oracle Database 19c Performance Tuning Guide - Managing Performance Through Baselines


NEW QUESTION # 56
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