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Oracle 1z1-084 Vorbereitungsfragen, 1z1-084 Prüfungsfrage

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Die Oracle 1Z0-084-Prüfung, auch als Oracle Database 19C Performance and Tuning Management Exam genannt, soll das Wissen und die Fähigkeiten eines Kandidaten bei der Verwaltung und Optimierung der Datenbankleistung in der Oracle-Datenbank 19C-Umgebungen testen. Die Prüfung deckt eine Reihe von Themen ab, einschließlich Leistungsstimmen, SQL -Tuning, Speicherverwaltung, Datenbankressourcenverwaltung und vielem mehr. Die Prüfung ist für Datenbankadministratoren, Datenbankentwickler und andere IT -Fachleute vorgesehen, die mit Oracle Database 19C zusammenarbeiten.

Oracle Database 19c Performance and Tuning Management 1z1-084 Prüfungsfragen mit Lösungen (Q26-Q31):

26. Frage
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 can improve OLTP workload performance by avoiding the use of indexes.
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 require all database data to fit in memory to improve query performance.

Antwort: B,E,F

Begründung:
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

27. Frage
Which Optimizer component helps decide whether to use a nested loop join or a hash join in an adaptive execution plan?

A. Automatic Reoptimization
B. SQL Plan Directives
C. Statistics Feedback
D. Statistics Collector
E. Dynamic Statistics

Antwort: D

Begründung:
In an adaptive execution plan, the Optimizer makes runtime decisions between nested loop and hash joins using a statistics collector. The collector is a row source that collects statistics about the rows it processes and can adapt the plan based on the number of rows processed.
References:
* Oracle Database SQL Tuning Guide, 19c

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

Antwort: C

Begründung:
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 theV$SERV_MOD_ACT_STATSdynamic 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 (
$ORACLE_BASE/diag), the aggregated statistics for services and modules are not written to trace files but are instead viewable through dynamic performance views.
* C (Incorrect):TheV$SERVICE_STATSview 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

29. Frage
An Oracle 19c database uses default values for all optimizer initialization parameters.
After a table undergoes partition maintenance, a large number of wait events occur for:
cursor: pin S wait on X
Which command reduces the number of these wait events?

A. ALTER SYSTEM SET CURSOR_SHARING = FORCE;
B. ALTER SYSTEM SET SESSION CACHED CURSORS = 500;
C. ALTER SYSTEM SET CURSOR_SPACE_FOR_TIME - TRUE;
D. ALTER SYSTEM SET CURSOR_INVALIDATION = DEFERRED;

Antwort: D

Begründung:
The cursor: pin S wait on X wait event suggests contention for a cursor pin, which is associated with mutexes (a type of locking mechanism) that protect the library cache to prevent concurrent modifications.
This issue can often be alleviated by deferring the invalidation of cursors until the end of the call to reduce contention. The correct command to use would be:
* C (Correct): ALTER SYSTEM SET CURSOR_INVALIDATION=DEFERRED; This setting defers the invalidation of dependent cursors until the end of the PL/SQL call, which can reduce the cursor: pin S wait on X wait events.
The other options are incorrect in addressing this issue:
* A (Incorrect): Setting CURSOR_SHARING to FORCE makes the optimizer replace literal values with bind variables. It doesn't address the contention for cursor pins directly.
* B (Incorrect): CURSOR_SPACE_FOR_TIME=TRUE aims to reduce the parsing effort by keeping cursors for prepared statements open. It may increase memory usage but does not directly resolve cursor: pin S wait on X waits.
* D (Incorrect): Increasing SESSION_CACHED_CURSORS caches more session cursors but doesn't necessarily prevent the contention indicated by the cursor: pin S wait on X wait events.
References:
* Oracle Database Reference: CURSOR_INVALIDATION
* Oracle Database Performance Tuning Guide: Reducing Cursor Invalidation

30. Frage
Examine this AWRreport excerpt:

You must reduce the impact of database I/O, without increasing buffer cache size and without modifying the SQL statements.
Which compression option satisfies this requirement?

A. STORE COMPRESS
B. MN STORE COMPRESS FOR QUERY LOW
C. ROW STORE COMPRESS ADVANCED
D. COLUMN STORE COMPRESS FOR QUERY HIGH

Antwort: C

Begründung:
To reduce the impact of database I/O without increasing the size of the buffer cache and without modifying SQL statements, you can use table compression. Among the given options,ROW STORE COMPRESS ADVANCEDis the most suitable form of table compression to satisfy this requirement.
Advanced row compression (ROW STORE COMPRESS ADVANCED) is designed to work well with all supported types of data, whether it's OLTP or data warehouse environments. It offers a higher level of compression than basic table compression (ROW STORE COMPRESS BASIC)without significant overhead during DML operations. This feature can help reduce the amount of I/O required to retrieve data by storing it more efficiently on disk.
* A, B, D:WhileCOLUMN STORE COMPRESS FOR QUERY HIGHandROW STORE
COMPRESSare both valid compression types,COLUMN STORE COMPRESS FOR QUERY
* HIGHapplies to the In-Memory column store and is not available in all versions and editions, andROW STORE COMPRESSis less advanced thanROW STORE COMPRESS ADVANCED.
References:
* Oracle Database Concepts Guide:Table Compression
* Oracle Database Performance Tuning Guide:Row Compression

31. Frage
......

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