Oracle 1Z0-084 PDF Questions - Accessible On Any Device

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Oracle 1Z0-084 exam is designed for individuals who want to demonstrate their knowledge and skills in performance tuning and management of Oracle Database 19c. 1Z0-084 exam is intended for database administrators, performance analysts, and developers who wish to improve the performance of their database systems. 1Z0-084 Exam Tests the candidates’ ability to identify and resolve performance issues in Oracle databases, as well as their knowledge of database architecture and performance tuning techniques.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q46-Q51):

NEW QUESTION # 46
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. Re-create the SALES table using the columns in IX_SALES_TIME_ID as the hash partitioning key.
C. Re-create the SALES table sorted in order of index IX_SALES_TIME_ID.
D. Partition index IX_SALES_TIME_ID using hash partitioning.

Answer: A

Explanation:
Given that index range scan operations onIX_SALES_TIME_IDare 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 usingADVANCED COMPRESSIONcan 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 theSALEStable 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 inIX_SALES_TIME_IDas a hash partitioning key for theSALES 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 # 47
Which two statements are true about disabling Automatic Shared Memory Management (ASMM)?

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

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 theSGA_TARGETparameter. IfSGA_TARGETis 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 settingSGA_TARGETto 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 # 48
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 rewriting the SQL statements
B. recommendations regarding the creation of SQL Patches
C. recommendations regarding the creation of additional indexes
D. recommendations regarding the creation of materialized views
E. recommendations regarding partitioning the tables

Answer: C,D

Explanation:
The SQL Tuning Advisor provides recommendations for improving SQL query performance. This may include suggestions for creating additional indexes to speed up data retrieval and materialized views to precompute and store query results.References:
* Oracle Database SQL Tuning Guide, 19c

NEW QUESTION # 49
Examine these commands, which execute successfully:

Which statement is true?

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

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 # 50
What is the right time to stop tuning an Oracle database?

A. When the buffer cache and library cache hit ratio is above 95%
B. When the I/O is less than 10% of the DB time
C. When the allocated budget for performance tuning has been exhausted
D. When all the concurrency waits are eliminated from the Top 10

Answer: C

Explanation:
The right time to stop tuning an Oracle database is often determined by the point of diminishing returns - when the cost of further tuning (in terms of time, resources, or money) exceeds the performance benefits gained.
This is often related to the budget allocated for performance tuning.
* A (Correct):When the allocated budget for performance tuning has been exhausted, it may be time to stop tuning unless the benefits of further tuning justify requesting additional budget.
* B (Incorrect):Eliminating all concurrency waits from the Top 10 is an unrealistic goal since some waits are inevitable and can occur due to application design, which might not be possible to eliminate completely.
* C (Incorrect):The buffer cache and library cache hit ratio being above 95% does not necessarily indicate that the database is fully optimized. Hit ratios are not reliable indicators of database performance and should not be used as sole criteria to end tuning efforts.
* D (Incorrect):Having I/O less than 10% of DB time is not a definitive indicator to stop tuning. It is essential to consider the overall performance goals and whether they have been met rather than focusing solely on I/O metrics.
References:
* Oracle Database Performance Tuning Guide:Introduction to Performance Tuning
* Oracle Database 2 Day + Performance Tuning Guide:Understanding the Tuning Process

NEW QUESTION # 51
......

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Oracle 1Z0-084 PDF Questions - Accessible On Any Device

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q46-Q51):

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