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Pass 1Z0-084 Guaranteed | Professional Oracle 1Z0-084 Latest Questions: Oracle Database 19c Performance and Tuning Management

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Oracle Database 19c Performance and Tuning Management Sample Questions (Q16-Q21):

NEW QUESTION # 16
Examine this statement and output:

Which three statements are true?

A. Session 9857 is not waiting.
B. Session 8779 may be waiting for a user or application response.
C. Session 9857 waited 1354 seconds for another process, which was also waiting for a transaction to end.
D. Session 8779 may be waiting due to a network problem.
E. Both 9822 and 8779 sessions are waiting for operating system resources.
F. Session 9822 will always stop waiting if the session that owns the TX enqueue issues a COMMIT statement as session 9822 is the first session in the transaction queue.

Answer: B,D,F

Explanation:
For this SQL statement and output, we can analyze the EVENT column to understand the type of wait:
B: The event "SQL*Net message from client" typically indicates that the session is waiting for a response from the client. This can be due to a network issue, user response, or an application processing delay.
E: The event "SQL*Net message from client" also implies that the session is idle waiting for the client (a user or an application) to send a request to the server. This event usually indicates that the session is not actively working but is instead waiting for the next command.
F: The wait event "enq: TX - row lock contention" suggests that session 9822 is waiting for a row-level lock held by another session. If the holding session issues a COMMIT or ROLLBACK, the lock will be released, and session 9822 will stop waiting. Since this session is experiencing row lock contention, it implies it's waiting for a specific transaction to complete.
References:
* Oracle Database Reference, 19c
* Oracle Wait Events Documentation

NEW QUESTION # 17
Which procedure gathers statistics that are always used in the generation of any execution plan?

A. DBMS_STATS.GATHER_DATABASE_STATS
B. DBMS_STATS.GATHER_DICTIONARY_STATS
C. DBMS_STATS.GATHER_FIXED_ OBJECTS_STATS
D. DBMS_STATS.GATHER_SYSTEM_STATS

Answer: A

Explanation:
TheDBMS_STATS.GATHER_DATABASE_STATSprocedure is used to gather statistics for all schema objects in the database that do not have up-to-date statistics. These statistics are essential for the optimizer to make informed decisions about the most efficient way to execute a query. The procedure collects statistics such as table and column statistics, index statistics, and system statistics, which are all used in the execution plan generation.
References:
* Oracle Database PL/SQL Packages and Types Reference, 19c
* Oracle Database Performance Tuning Guide, 19c

NEW QUESTION # 18
Which three statements are true about using the in Memory (IM) column store?

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

Answer: A,B,E

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 # 19
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?

A. Compress the SALES table.
B. Increase PCTFREE for the SALES table.
C. Coalesce all sales table indexes.
D. Re-create the SALES table.
E. Partition the SALES table.

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 # 20
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 rewriting the SQL statements
C. recommendations regarding partitioning the tables
D. recommendations regarding the creation of materialized views
E. recommendations regarding the creation of additional indexes

Answer: D,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 # 21
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