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| Section | Weight | Objectives |
|---|---|---|
| Memory and I/O Management | 20% | - PGA and temporary space management - Configuring Automatic Memory Management - Diagnosing and resolving I/O bottlenecks - Tuning buffer cache and shared pool |
| SQL Tuning and Optimization | 30% | - Using SQL Tuning Advisor and SQL Access Advisor - Indexing and partitioning strategies - Execution plan analysis and optimization - Managing optimizer statistics |
| Advanced Performance Features and Tools | 10% | - Result Cache management - Big Table Caching and Flash Cache - In-Memory Column Store configuration and usage - Application performance monitoring and services |
| Introduction to Performance Tuning | 15% | - Understanding database architecture impact on performance - Identifying performance problems - Performance tuning methodology |
| Database Performance Monitoring | 25% | - Real-time monitoring and alerts - ASH and performance statistics - Using AWR and ADDM - Automated maintenance tasks |
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NEW QUESTION # 44
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?
Answer: A,E
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 # 45
Which three statements are true about tuning dimensions and details of v$sys_time_model and DB time?
Answer: A,E,F
Explanation:
A: Statspack is a performance diagnostic tool that can help identify high CPU usage issues. High CPU time may indicate that SQL statements need to be tuned for better performance.
D: High wait times can often be reduced by instance tuning, such as adjusting database parameters or improving I/O performance.
F: DB Time is a cumulative time metric that includes the time spent by both user sessions and background processes executing database calls.References:
* Oracle Database Performance Tuning Guide, 19c
* Oracle Database Concepts, 19c
NEW QUESTION # 46
Which two options are part of a Soft Parse operation?
Answer: A
NEW QUESTION # 47
Accessing the SALES tables causes excessive db file sequential read wait events.
Examine this AWR except:
Now, examine these attributes displayed by querying dba_tables:
Finally, examine these parameter settings:
Which two must both be used to reduce these excessive waits?
Answer: A,E
Explanation:
The AWR excerpt points to excessive physical reads on the SALES table and index, suggesting the need for optimizing table storage and access.
Partitioning the SALES table (A) can reduce 'db file sequential read' waits by breaking down the large SALES table into smaller, more manageable pieces. This can localize the data and reduce the I/O necessary for query operations.
Compressing the SALES table (D) can also help reduce I/O by minimizing the amount of data that needs to be read from disk. This can also improve cache utilization and reduce the 'db file sequential read' waits.
References:
* Oracle Database VLDB and Partitioning Guide, 19c
* Oracle Database Administrator's Guide, 19c
These changes are recommended based on Oracle's best practices for managing large tables and reducing I/O waits, ensuring better performance and efficiency.
NEW QUESTION # 48
Examine this output of a query of VSPGA_TAPGET_ADVICE:
Which statements is true'
Answer: B
Explanation:
The V$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 # 49
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