FREE PDF 2025 ORACLE 1Z1-084: ORACLE DATABASE 19C PERFORMANCE AND TUNING MANAGEMENT–VALID PASS GUARANTEED

Free PDF 2025 Oracle 1z1-084: Oracle Database 19c Performance and Tuning Management–Valid Pass Guaranteed

Free PDF 2025 Oracle 1z1-084: Oracle Database 19c Performance and Tuning Management–Valid Pass Guaranteed

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Oracle 1Z0-084 exam is an essential certification for professionals who want to enhance their career prospects in the field of database administration and performance tuning. Oracle Database 19c Performance and Tuning Management certification is recognized globally and is highly valued by employers. Oracle Database 19c Performance and Tuning Management certification demonstrates the candidate's expertise in database performance and tuning management and their ability to optimize database performance.

Oracle 1Z0-084 exam is designed to test a candidate's knowledge and skills in managing and tuning the performance of an Oracle Database 19c system. 1z1-084 Exam is intended for database administrators, performance analysts, and technical consultants who are responsible for ensuring the optimal performance of Oracle Database systems. 1z1-084 exam covers a range of topics, including database architecture, memory management, SQL tuning, and system troubleshooting.

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Oracle 1Z0-084 exam is divided into four main sections that cover a wide range of topics. The first section, Oracle Database Performance Tuning Concepts, covers the basics of Oracle Database 19c performance tuning architecture, memory, and storage management. The second section, Database Resource Management, covers topics such as the automatic database diagnostic monitor, Oracle database time model, and the Resource Manager.

Oracle Database 19c Performance and Tuning Management Sample Questions (Q44-Q49):

NEW QUESTION # 44
Examine this statement and output:

Which two situations can trigger this error?

  • A. The syntax is incomplete.
  • B. The capture directory is part of the root file system.
  • C. The instance is unable to access the capture directory.
  • D. There is a file in the capture directory.
  • E. The user lacks the required privileges to execute the DBMS WORKLOAD CAPTURE package or the directory.

Answer: C,E

Explanation:
The ORA-15505 error indicates that the instance encountered errors while trying to access the specified directory. This could be due to:
A: Insufficient privileges: The user attempting to start the workload capture might not have the required permissions to execute the DBMS_WORKLOAD_CAPTURE package or to read/write to the directory specified.
E: Accessibility: The database instance may not be able to access the directory due to issues such as incorrect directory path, directory does not exist, permission issues at the OS level, or the directory being on a file system that's not accessible to the database instance.
References:
* Oracle Database Error Messages, 19c
* Oracle Database Administrator's Guide, 19c


NEW QUESTION # 45
What is the right time to stop tuning an Oracle database?

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

Answer: A

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 # 46
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. One or more results were aged out of the result cache.
  • D. 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.
  • E. result_cache_max_size is set dynamically to 0.

Answer: C,E

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 # 47
Examine this output of a query of VSPGA_TAPGET_ADVICE:

Which statements is true'

  • A. PGAA_AGGREGATE should be set to at least 800 MB.
  • B. GGREGATE_TARGET should be set to at least 700 MB.
  • C. With a target of 700 MB or more, all multipass executions work areas would be eliminated.
  • D. With a target of 800 MB or more, all one-pass execution work areas would be eliminated.

Answer: C

Explanation:
The V$PGA_TARGET_ADVICE view provides advice on potential performance improvements by adjusting the PGA_AGGREGATE_TARGET parameter. The column ESTD_OVERALLOC_COUNT indicates the estimated number of work areas that would perform multiple passes if the PGA_AGGREGATE_TARGET were set to the size in the TARGET_MB column.
A: According to the output, at the target of 700 MB, the ESTD_OVERALLOC_COUNT is 30. This suggests that if PGA_AGGREGATE_TARGET is set to 700 MB, 30 multipass execution work areas would be required. If we look further down, at the target of 800 MB, the ESTD_OVERALLOC_COUNT is 0, indicating that increasing PGA_AGGREGATE_TARGET to 800 MB or more would eliminate the need for multipass executions, not at 700 MB as initially suggested by the option. Hence, the verified answer derived from the data is slightly nuanced; it should be 800 MB to eliminate all multipass executions.
References:
* Oracle Database Performance Tuning Guide, 19c
* Oracle Database Reference, 19c


NEW QUESTION # 48
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. Partition index IX_SALES_TIME_ID using hash partitioning.
  • B. Re-create the SALES table sorted in order of index IX_SALES_TIME_ID.
  • C. Re-create index IX_SALES_TIME_ID using ADVANCED COMPRESSION.
  • D. Re-create the SALES table using the columns in IX_SALES_TIME_ID as the hash partitioning key.

Answer: C

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 # 49
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