ORACLE 1Z1-084 EXAM & NEW 1Z1-084 DUMPS QUESTIONS

Oracle 1z1-084 Exam & New 1z1-084 Dumps Questions

Oracle 1z1-084 Exam & New 1z1-084 Dumps Questions

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Oracle 1Z0-084 exam is a comprehensive test that covers a range of topics related to database performance and tuning management. These topics include SQL tuning, database instance tuning, memory management, and troubleshooting performance issues. 1z1-084 Exam also evaluates the ability of the candidate to use various performance tuning tools and features of Oracle Database 19c.

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q13-Q18):

NEW QUESTION # 13
Buffer cache access is too frequent when querying the SALES table. Examine this command which executes successfully:
ALTER TABLE SALES SHRINK SPACE;
For which access method does query performance on sales improve?

  • A. index range scan
  • B. db file scattered read
  • C. index full scan
  • D. db file sequential read

Answer: D

Explanation:
The SHRINK SPACE operation compacts the table, which can reduce fragmentation and thus improve performance for sequential reads of the table. This operation could improve full table scans, which are typically associated with db file sequential read wait events.
References:
* Oracle Database Administrator's Guide, 19c


NEW QUESTION # 14
Users complain about slowness and session interruptions. Additional checks reveal the following error in the application log:

Which file has additional information about this error?

  • A. SQL trace file automatically generated by the error
  • B. ASH report
  • C. Session trace file SQL trace file automatically generated by the error
  • D. Alert log

Answer: D

Explanation:
When an ORA-00060 deadlock error occurs, detailed information about the error and the deadlock graph are dumped into the alert log. This log contains a trace file name that you can use to find additional detailed information about the sessions involved in the deadlock and the SQL statements they were executing.
References:
* Oracle Database Administrator's Guide, 19c
* Oracle Database Error Messages, 19c


NEW QUESTION # 15
What are the least elevated values of statistics_level and C0NTR0LJ4ANAGEMENT_PACK_ACCESS that allow the usage of Monitoring of Database Operations?

  • A. STATISTICS_LEVEL=BASIC and CONTROL_MANAGEMENT_PACK ACCESS=DIAGOSTIC
  • B. STATISTICS_LEVEL=TYPICAL and
    CONTROL_MANAGEMENT_PACK_ACCESS-DIAGOSTIC*TUNING
  • C. STATISTICS_LEVEL=TYPICAL and CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC
  • D. STATISTICS_LEVEL=ALL and
    CONTROL_MANAGEMENT_PACK_ACCESS=DIAGOSTIC+TUNING

Answer: D

Explanation:
Monitoring of Database Operations requires that theSTATISTICS_LEVELparameter be set toALLand CONTROL_MANAGEMENT_PACK_ACCESSbe set toDIAGNOSTIC+TUNING. These settings enable all the advisory features and automatic tuning features within the Oracle Database, including the Automatic Workload Repository (AWR), Automatic Database Diagnostic Monitor (ADDM), and the full functionality of the SQL Tuning Advisor and SQL Access Advisor, which are components of the Diagnostic and Tuning packs.
* STATISTICS_LEVEL=ALL:This setting enables the collection of all system statistics for problem detection and self-tuning purposes.
* CONTROL_MANAGEMENT_PACK_ACCESS=DIAGNOSTIC+TUNING:This grants access to both the Diagnostic Pack and the Tuning Pack, which are essential for detailed performance monitoring and tuning capabilities.
References:
* Oracle Database Reference:STATISTICS_LEVEL
* Oracle Database Licensing Information User Manual:Oracle Database Management Packs


NEW QUESTION # 16
Which three statements are true about using the in Memory (IM) column store?

  • A. It does not improve performance for queries using cached results of function evaluations on columns from the same table.
  • B. It does not require all database data to fit in memory to improve query performance.
  • C. It does not improve performance for queries that use join groups on columns from different tables.
  • D. It can improve OLTP workload performance by avoiding the use of indexes.
  • E. It does not improve performance for queries using user-defined virtual column results.
  • F. It improves performance for queries joining several tables using bloom filter joins.

Answer: B,D,F

Explanation:
The Oracle In-Memory (IM) column store feature enhances the performance of databases by providing a fast columnar storage format for analytical workloads while also potentially benefiting OLTP workloads.
* C (True): It can improve OLTP workload performance by providing a faster access path for full table scans and reducing the need for indexes in certain scenarios, as the In-Memory store allows for efficient in-memory scans.
* E (True): The In-Memory column store does not require all database data to fit in memory. It can be used selectively for performance-critical tables or partitions, and Oracle Database will manage the population and eviction of data as needed.
* F (True): In-Memory column store can significantly improve performance for queries joining several tables, especially when bloom filters are used, as they are highly efficient with the columnar format for large scans and join processing.
The other options provided are not correct in the context of the In-Memory column store:
* A (False): While In-Memory column store is designed for analytical queries rather than caching results of function evaluations, it does not specifically avoid improving performance for queries using cached results of function evaluations.
* B (False): In-Memory column store can improve the performance of queries that use join groups, which can be used to optimize joins on columns from different tables.
* D (False): In-Memory column store can improve the performance of queries using expressions, including user-defined virtual columns, because it supports expression statistics which help in optimizing such queries.
References:
* Oracle Database In-Memory Guide: In-Memory Column Store in Oracle Database
* Oracle Database In-Memory Guide: In-Memory Joins
* Oracle Database In-Memory Guide: In-Memory Aggregation


NEW QUESTION # 17
Database performance degraded between 23:15 and 23:30 for the last three nights. The awr snapshot interval is one hour. The AODM report contains nothing about this performance problem.
With which tool can you further analyze this problem?

  • A. SQL Performance Analyzer
  • B. SQL Tuning Advisor
  • C. Active Session History report
  • D. AWR Compare Periods report

Answer: C

Explanation:
The Active Session History (ASH) report is a tool that provides detailed information about active sessions for the time period specified. Since the AWR snapshot interval is one hour and does not capture the granularity needed for this issue, ASH reports aremore suitable as they contain more granular data for sessions that were active during the period of interest.
References:
* Oracle Database Performance Tuning Guide, 19c


NEW QUESTION # 18
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