Oracle Database 19c: Performance Management and Tuning Exam Practice Test
The Oracle Database 19c: Performance Management and Tuning Exam practice page focuses on diagnosing database behavior and improving SQL execution. Its practice bank includes scenarios about optimizer transformations, shared SQL areas, parallel execution, memory use, session activity, and identifying blockers. These concepts support evidence-based tuning decisions across active workloads.
Exam overview
About the Oracle Database 19c: Performance Management and Tuning Exam
Performance work involves connecting observed symptoms to the database components that can explain them. Practice scenarios address locating active statements and blocking sessions through dynamic performance views, interpreting work-area runtime details, and understanding how PGA allocation affects memory-intensive operations. Other questions examine reducing repeated parsing through SQL sharing, choosing when parallel execution can help, and recognizing optimizer techniques such as subquery unnesting and remote query processing. Workload replay and health-check tools also appear as ways to evaluate configuration changes or assess database practices. For each scenario, identify the operational goal first—such as limiting data transfer, avoiding temporary-space use, or finding a blocker—then match it to the relevant Oracle mechanism or diagnostic source. This connects tuning choices to measurable behavior rather than relying on configuration changes without evidence.
Sample Practice Questions
Review a selection from this exam's published US Practice Tests practice bank.
An administrator needs a repeatable way to assess whether a database configuration meets a selected set of performance-related best practices. Which Oracle tool is intended for database health checks?
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Correct answer: BThe Health Check capability in the Oracle Support Workbench runs diagnostic checks against database components and reports findings that can help identify configuration or health issues. The other tools serve data loading, workload replay, or export purposes.
A query accesses a remote table through a database link. Which optimizer technique can reduce data transfer by performing suitable operations at the remote site?
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Correct answer: APredicate pushdown can move eligible filters to the remote database so fewer rows need to cross the database link. The optimizer's ability to push operations depends on query structure and compatibility between the sites.
A SQL statement repeatedly executes the same correlated subquery for many outer rows. Which SQL transformation may allow Oracle to process the subquery more efficiently as a join or inline view?
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Correct answer: ASubquery unnesting transforms certain nested subqueries into joins or inline views, potentially enabling more efficient plans. The other options address partition access, selectivity estimation, and space reclamation.
A DBA wants to see SQL statements currently executing along with their session identifiers and SQL identifiers. Which dynamic performance view is a direct source for current session activity?
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Correct answer: AV$SESSION contains information about current sessions, including identifiers that can be used to associate a session with its current SQL activity. The other views describe users, initialization parameters, or datafiles.
A DBA wants to reduce hard parses for frequently executed SQL statements while allowing Oracle to share reusable SQL areas. Which configuration choice most directly supports this behavior?
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Correct answer: AReusable cursors and their parsed representations reside in the shared pool's library cache. Adequate shared pool capacity and consistent SQL text help Oracle reuse cursors rather than repeatedly hard-parse statements. The other choices do not directly promote cursor sharing.
For a parallel SQL operation, what does the degree of parallelism generally describe?
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Correct answer: BDegree of parallelism (DOP) describes the parallel execution capacity assigned to an operation, commonly expressed in terms of parallel execution servers. Actual resource use can be affected by policies, workload, and available servers.
Which Oracle feature can record and replay a representative database workload in a test environment to evaluate changes?
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Correct answer: ADatabase Replay captures a workload and can replay it in a test system, helping assess the effect of system changes under a representative workload. The other options address data loading, historical data access, and data movement.
How to use this practice test
Access is free. A session presents up to 20 random questions from the 50-question practice bank and shows results afterward. Use each result to identify gaps in SQL tuning, memory diagnosis, optimizer behavior, or session-level troubleshooting, then revisit the relevant Oracle Database concepts before another session.
Preparation tips
- Practice tracing a blocked session to its blocker using session-level dynamic performance information, and distinguish current activity from historical SQL data.
- Compare work-area runtime behavior for operations completed in memory with those that use temporary space; relate automatic sizing to PGA memory management.
- Review how SQL sharing can reduce hard parsing, and distinguish that goal from optimizer transformations such as subquery unnesting.
- For remote SQL scenarios, identify which operations can be performed at the remote site to limit data transferred over a database link.
- Study how workload replay and database health checks support evaluation: one tests representative workload behavior, while the other assesses selected practices.