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Oracle Database 19c Performance and Tuning Management Sample Questions (Q38-Q43):

NEW QUESTION # 38
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. Both SGA_TARGET and SGA_MAX_SIZE must be set to zero.
C. All auto-tuned SGA components are reset to their original user-defined values.
D. It requires a database instance restart to take effect.
E. All SGA components retain their current sizes at the time of disabling.
F. The SGA size remains unaffected after disabling ASMM.

Answer: E,F

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 # 39
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 additional indexes
C. recommendations regarding the creation of materialized views
D. recommendations regarding partitioning the tables
E. recommendations regarding rewriting the SQL statements

Answer: B,C

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 # 40
You need to collect and aggregate statistics for the ACCTG service and PAYROLL module, and execute:

Where do you find the output of this command?

A. In $ORACLE_BASE/diag/rdbms/<db unique name>/<instance name>/trace
B. By viewing V$SERV_MOD_ACT_STATS
C. In the current working directory
D. By viewing V$SERVICE_STATS

Answer: B

Explanation:
When you enable statistics gathering for a specific service and module using DBMS_MONITOR.
SERV_MOD_ACT_STAT_ENABLE, the output is aggregated and can be viewed using the V$SERV_MOD_ACT_STATS dynamic performance view. This view contains the cumulative statistics of database activity broken down by service and module, which is exactly what you collect when executing the provided command.
* B (Incorrect): While many types of trace files are located in the Diagnostic Destination directory (
$ORACLE_BASE/diag), the aggregated statistics for services and modules are not written to trace files but are instead viewable through dynamic performance views.
* C (Incorrect): The V$SERVICE_STATS view provides service-level statistics but does not provide the combined service/module-level breakdown.
* D (Incorrect): The output of the PL/SQL block is not written to a file in the current working directory; it is stored in the data dictionary and accessible via dynamic performance views.
References:
* Oracle Database PL/SQL Packages and Types Reference: DBMS_MONITOR
* Oracle Database Reference: V$SERV_MOD_ACT_STATS

NEW QUESTION # 41
Examine these commands, which execute successfully:

Which statement is true?

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

Answer: B

Explanation:
The DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS procedure 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 # 42
Which three statements are true about using the in Memory (IM) column store?

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

Answer: B,C,D

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 # 43
......

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q38-Q43):

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