Performance Tuning And Diagnostics

You need to identify the top SQL statements consuming the most CPU resources in an Oracle 23ai database over the last hour. Which tool provides the most direct analysis of this performance issue?

To improve performance, you suspect an index is missing. Which advisor should you invoke to get recommendations for new indexes?

You have a query that is performing poorly due to a stale execution plan. You want to lock the current optimal plan to prevent the optimizer from changing it during subsequent runs. What should you do?

You notice that Automatic SQL Plan Management is not evolving your plans as expected. What is the most likely cause?

An application query is failing to use a newly created index. You suspect the optimizer statistics are inaccurate. Which package should you use to gather statistics for this specific table?

You are tuning a complex SQL statement. You want to see the execution plan that the optimizer is currently choosing. Which dynamic performance view is most useful?

Which component of the Oracle Database uses the Automatic Diagnostic Repository (ADR) to store critical errors and performance incidents?

A production database experiences a sudden performance degradation. You want to analyze the last 10 minutes of activity to pinpoint blocked sessions. Which approach is best?

What is the primary function of ADDM in Oracle Database 23ai?

Which parameter controls the frequency of AWR snapshot collection?

You want to capture a specific set of SQL statements and their execution plans to baseline them. Which package allows you to capture plans from the cursor cache?

An application is experiencing high library cache lock contention. Which view is best suited to investigate this specific wait event?

You need to determine why a particular session is experiencing high 'db file sequential read' waits. Which view provides the most detailed information about the specific blocks being read?

You are using SQL Plan Management. What happens when a new execution plan is discovered for a SQL statement that already has a baseline?

You are performing a SQL tuning exercise. How do you create a SQL Tuning Set (STS) to be used as input for the SQL Tuning Advisor?

When reviewing an AWR report, you notice a high value for 'db time'. What does this indicate?

Which view displays the current settings for the AWR retention period?

Which report provides a summary of SQL statements that have the highest 'Elapsed Time'?

You have a query that is being incorrectly optimized because the statistics are not representative of the actual data distribution. What is the best method to handle this without changing the global statistics?

Which procedure in the DBMS_SPM package is used to evolve a SQL plan baseline?

What is the result of setting STATISTICS_LEVEL to 'BASIC'?

An ADDM report suggests increasing the library cache size. What is the most appropriate action?

You are investigating high CPU utilization in the database. Which view provides the top SQL statements currently in memory based on CPU usage?

You have a query that is using a nested loops join, but it should be using a hash join. The optimizer statistics are correct. How can you force a hash join without changing the SQL text?

You are analyzing a query with the SQL Tuning Advisor. The advisor recommends an 'SQL Profile'. What does the profile actually do?

Which of the following is true regarding SQL Plan Baselines?

When running the SQL Tuning Advisor, what does the 'Accept' action do?

What is the purpose of the 'ASH' report?

How can you view the recommendations made by the Automatic Database Diagnostic Monitor (ADDM)?

Which background process is responsible for capturing AWR snapshots?

You are seeing 'enq: TX - row lock contention' in your performance reports. What does this mean?

What does the 'Elapsed Time' in a SQL statement represent?

You notice that a specific query is performing very slowly due to excessive 'direct path read' waits. What is the most likely cause?

Which of these is the most effective way to address performance issues caused by suboptimal plans?

When using SQL Tuning Advisor, what is a 'SQL Tuning Set' (STS)?

What is the primary benefit of using a SQL Profile?

In which view can you find information about the current SQL Plan Baselines?

You have a high volume of parse time in your database. What could be the cause?

Which advisor should you run to determine if your SGA and PGA memory settings are optimal?

Which feature allows you to capture SQL statements from the cursor cache and load them into a SQL Tuning Set?

What does the 'SQL ID' in an Oracle database represent?

Which THREE of the following are components of the Oracle performance tuning lifecycle?

Which TWO views can be used to monitor current session performance?

You are tuning a query that is performing poorly due to high 'buffer busy waits'. What is the likely cause?

Which THREE factors influence the optimizer's choice of an execution plan?

Which TWO methods can be used to tune SQL statements?

Which THREE types of information are captured in an AWR snapshot?

Which THREE items are required for the Automatic SQL Plan Management to effectively stabilize plans?

Which TWO of these are common sources of performance degradation?

Which THREE pieces of information can be found in a SQL Tuning Advisor report?

Which TWO components are essential for the operation of the Automatic Database Diagnostic Monitor (ADDM)?

Which THREE actions can you take to improve execution plan stability?

You observe a significant performance regression after a database upgrade. You suspect that the optimizer has chosen a suboptimal execution plan. Which component of SQL Plan Management should you use to ensure the database only uses known, verified execution plans?

An administrator needs to identify the top wait events causing performance degradation in the database over the last hour. Which tool provides the most granular, session-level view of these wait events?

The Automatic SQL Plan Management (ASPM) feature is enabled. A new execution plan is identified for a high-load query that performs better during testing. How does the database verify this plan before evolving the baseline?

You are analyzing an AWR report and notice a high value for 'db file scattered read'. What is the most likely cause of this wait event?

A critical application query is experiencing performance issues due to stale optimizer statistics. You want to use the Optimizer Statistics Advisor to identify the root cause. Which action must you perform to trigger the advisor?

An administrator has been tasked with reducing the overhead of AWR snapshot collection. What is the most effective way to modify the snapshot interval?

You need to capture a specific set of SQL statements that are causing high CPU usage for later tuning. Which tool allows you to group these statements and transport them across different database environments?

Which THREE of the following are valid components or features of the Automatic SQL Tuning process in Oracle 23ai?

When using the SQL Tuning Advisor to analyze a SQL statement, which THREE types of recommendations can it provide to improve performance?

Which TWO types of reports are most useful for diagnosing long-term database performance trends?