VALID ORACLE 1Z1-084 EXAM PREP, 1Z1-084 LATEST LEARNING MATERIALS

Valid Oracle 1z1-084 Exam Prep, 1z1-084 Latest Learning Materials

Valid Oracle 1z1-084 Exam Prep, 1z1-084 Latest Learning Materials

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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.

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1z1-084 Latest Learning Materials, 1z1-084 Actual Exam Dumps

PrepAwayTest Oracle 1z1-084 practice exam software went through real-world testing with feedback from more than 90,000 global professionals before reaching its latest form. The Oracle 1z1-084 Exam Dumps are similar to real exam questions. Our Oracle 1z1-084 practice test software is suitable for computer users with a Windows operating system.

Oracle 1Z0-084 exam covers a wide range of topics related to performance tuning and management of Oracle Database 19c. 1z1-084 exam tests the candidate's ability to identify and troubleshoot performance issues, optimize database performance, and implement performance-related features and functionalities. 1z1-084 Exam also covers topics such as database monitoring, capacity planning, and performance tuning methodologies.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q21-Q26):

NEW QUESTION # 21
You want to reduce the amount of db file scattered read that is generated in the database. You execute the SQL Tuning Advisor against the relevant workload. Which two can be part of the expected result?

  • A. recommendations regarding the creation of SQL Patches
  • B. recommendations regarding the creation of materialized views
  • C. recommendations regarding partitioning the tables
  • D. recommendations regarding rewriting the SQL statements
  • E. recommendations regarding the creation of additional indexes

Answer: D,E

Explanation:
https://docs.oracle.com/en/database/oracle/oracle-database/21/tgsql/sql-tuning-advisor.html#GUID-
8E1A39CB-A491-4254-8B31-9B1DF7B52AA1
The goal is to reduce the db file scattered read waits, which are associated with full table scans. These are I
/O operations where Oracle retrieves data blocks scattered across the disk, typically when large amounts of data are read inefficiently. Running the SQL Tuning Advisor analyzes the workload and provides tuning recommendations. Let's evaluate the options.
Why A. Recommendations regarding the creation of additional indexes is correct:
* Full table scans (which cause db file scattered read) often occur because suitable indexes are missing.
* The SQL Tuning Advisor can identify queries that would benefit from indexes and recommend creating them. Indexes allow the database to access data more efficiently using row lookups, reducing the need for full table scans.
Why B. Recommendations regarding rewriting the SQL statements is correct:
* Sometimes, poorly written SQL statements cause inefficient execution plans that lead to db file scattered read.
* SQL Tuning Advisor can recommend SQL rewrites to make better use of indexes, avoid full table scans, or optimize joins. For example:
* Rewriting predicates to use indexed columns.
* Using hints to guide the optimizer.
Why Other Options Are Incorrect:
* C. Recommendations regarding the creation of materialized views:
* Materialized views are typically recommended to optimize complex queries involving aggregations or joins, not to address db file scattered read directly. They are less relevant for solving I/O issues caused by full table scans in this context.
* D. Recommendations regarding the creation of SQL Patches:
* SQL Patches are used to influence the execution plan for specific SQL statements. While SQL Patches can potentially fix performance issues, the SQL Tuning Advisor focuses on improving SQL and database design rather than patching queries.
* E. Recommendations regarding partitioning the tables:
* Partitioning tables can improve query performance, especially for very large datasets. However, this is a database design-level recommendation and is not typically provided by SQL Tuning Advisor. Partitioning would not directly target db file scattered read.
How SQL Tuning Advisor Helps:
The SQL Tuning Advisor provides actionable recommendations, such as:
* Creating indexes to reduce full table scans.
* Rewriting SQL to optimize the execution plan.
* Improving statistics to help the optimizer make better decisions.
References to Oracle Documentation:
* Oracle Database 19c Performance Tuning Guide:
* Section: Using SQL Tuning Advisor to Optimize Workloads.
* Explains recommendations for indexes and SQL rewrites to reduce I/O.
* Understanding Wait Events:
* Details about db file scattered read and how to address it.


NEW QUESTION # 22
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. Set OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES to TRUE.
  • B. Increase the size of the library cache.
  • C. Create the RECYCLE cache and cache tables accessed by the SQL statements.
  • D. Create the KEEP cache and cache tables accessed by the SQL statements.
  • E. Set the CURSOR_SHARING parameter to FORCE.

Answer: B,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 # 23
You must configure and enable Database Smart Flash Cache for a database.
You configure these flash devices:

Examine these parameter settings:

What must be configured so that the database uses these devices for the Database Smart Flash Cache?

  • A. Disable Automatic Memory Management and set SGA_TARGET to 256G.
  • B. Set DB_FLASH_CACHE_SIZE parameter to 128G, 64G.
  • C. Set DB_FLASH_CACHE_SIZE to 256G and change device /dev/sdk to 128G.
  • D. Set DB_FLASH_CACHE_SIZE parameter to 192G.
  • E. Set DB_FLASH_CACHE_SIZE to 192G and MEMORY_TARGET to 256G.

Answer: B

Explanation:
To configure and enable Database Smart Flash Cache, you must set the DB_FLASH_CACHE_SIZE parameter to reflect the combined size of the flash devices youintend to use for the cache. In this scenario, two flash devices are configured: /dev/sdj with 128G and /dev/sdk with 64G.
* Determine the combined size of the flash devices intended for the Database Smart Flash Cache. In this case, it's 128G + 64G = 192G.
* However, Oracle documentation suggests setting DB_FLASH_CACHE_SIZE to the exact sizes of the individual devices, separated by a comma when multiple devices are used.
* Modify the parameter in the database initialization file (init.ora or spfile.ora) or using an ALTER SYSTEM command. Here's the command for altering the system setting:
ALTER SYSTEM SET DB_FLASH_CACHE_SIZE='128G,64G' SCOPE=SPFILE;
* Since this is a static parameter, a database restart is required for the changes to take effect.
* Upon database startup, it will allocate the Database Smart Flash Cache using the provided sizes for the specified devices.
It is important to note that MEMORY_TARGET and MEMORY_MAX_TARGET parameters should be configured independently of DB_FLASH_CACHE_SIZE. They control the Oracle memory management for the SGA and PGA, and do not directly correlate with the flash cache configuration.
References
* Oracle Database 19c Documentation on Database Smart Flash Cache
* Oracle Support Articles and Community Discussions on DB_FLASH_CACHE_SIZE Configuration


NEW QUESTION # 24
Which Optimizer component helps decide whether to use a nested loop join or a hash join in an adaptive execution plan?

  • A. SQL Plan Directives
  • B. Statistics Collector
  • C. Statistics Feedback
  • D. Dynamic Statistics
  • E. Automatic Reoptimization

Answer: B

Explanation:
In an adaptive execution plan, the Optimizer makes runtime decisions between nested loop and hash joins using a statistics collector. The collector is a row source that collects statistics about the rows it processes and can adapt the plan based on the number of rows processed.
References:
* Oracle Database SQL Tuning Guide, 19c


NEW QUESTION # 25
Which two statements are true about disabling Automatic Shared Memory Management (ASMM)?

  • A. Both SGA_TARGET and SGA_MAX_SIZE must be set to zero.
  • B. The SGA size remains unaffected after disabling ASMM.
  • C. All SGA components retain their current sizes at the time of disabling.
  • D. All auto-tuned SGA components are reset to their original user-defined values.
  • E. All SGA components excluding fixed SGA and other internal allocations are readjusted immediately after disabling ASMM.
  • F. It requires a database instance restart to take effect.

Answer: B,C

Explanation:
When ASMM is disabled, the sizes of the automatically managed SGA components remain at their current values. ASMM is controlled by the SGA_TARGET parameter. If SGA_TARGET is set to a non-zero value, ASMM is enabled and Oracle will automatically manage the sizes of the various SGA components. When ASMM is disabled, by setting SGA_TARGET to zero, the SGA components that were automatically sized will retain their current sizes rather than being reset to their original user-defined values. The overall size of the SGA remains the same unless manually changed by modifying individual component sizes or SGA_MAX_SIZE.
References:
* Oracle Database Administration Guide, 19c
* Oracle Database Performance Tuning Guide, 19c


NEW QUESTION # 26
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