多选题Which three statements about performance analysis by SQL Performance Analyzer are true? （）(Choose three.)AIt detects changes in SQL execution plans.BIt produces results that can be used to create the SQL plan baseline.CThe importance of SQL statements

第1题：

When executing a SQL workload，you choose to generate execution plans only， without collecting execution statistics.  Which two statements describe the implications of this？（）

• A、 It produces less accurate results of the comparison analysis.
• B、 It automatically calls the SQL Tuning Advisor for recommendations.
• C、 It shortens the time of execution and reduces the impact on system resources.
• D、 Only the changes in the execution plan，and not performance regression，are detected.

第2题：

Which of these appropriately describes the results of a manual SQL Tuning Advisor task？（）  

• A、 A list of SQL statements and recommendations for tuning
• B、 A list of SQL statements that have been tuned by the Advisor，with before and after metrics 
• C、 Graphs showing the actual performance improvement made by the Advisor after it implemented the recommended changes
• D、 All of the above

第3题：

第4题：

Which two statements are true regarding the SQL Repair Advisor？（） 

• A、 The SQL Repair Advisor can be invoked to tune the performance of the regressed SQL statements.
• B、 The SQL Repair Advisor can be invoked even when the incident is not active for a SQL statement crash.
• C、 The SQL Repair Advisor is invoked by the Health Monitor when it encounters the problematic SQL statement.
• D、 The DBA can invoke the SQL Repair Advisor when he or she receives an alert generated when a SQL statement crashes and an incident is created in the ADR.

第5题：

While deploying a new application module, the software vendor ships the application software along with appropriate SQL plan baselines for the new SQLs being introduced. Which two statements describe the consequences?（）

• A、The plan baselines can be evolved over time to produce better performance.
• B、The newly generated plans are directly placed into the SQL plan baseline without being verified.
• C、The new SQL statements initially run with the plans that are known to produce good performance under standard test configuration.
• D、The optimizer does not generate new plans for the SQL statements for which the SQL plan baseline has been imported.

第6题：

Which three statements about performance analysis by SQL Performance Analyzer are true? （）

• A、It detects changes in SQL execution plans.
• B、It produces results that can be used to create the SQL plan baseline.
• C、The importance of SQL statements is based on the size of the objects accessed.
• D、It generates recommendations to run SQL Tuning Advisor to tune regressed SQLs.
• E、It shows only the overall impact on workload and not the net SQL impact on workload.

第7题：

Which three statements about performance analysis by SQL Performance Analyzer are true? （）(Choose three.)

• A、It detects changes in SQL execution plans.
• B、It produces results that can be used to create the SQL plan baseline.
• C、The importance of SQL statements is based on the size of the objects accessed.
• D、It generates recommendations to run SQL Tuning Advisor to tune regressed SQLs.
• E、It shows only the overall impact on workload and not the net SQL impact on workload.

第8题：

An administrator determines that performance has degraded for a WebSphere Commerce database.  Which of the following steps should be performed to correct this problem？（）

• A、Cleanup obsolete data
• B、Clear the WebSphere Commerce cache
• C、Enable WebSphere Commerce Accelerator
• D、Reindex the database tables
• E、Run Performance Monitor to monitor SQL statements

第9题：

Which of these appropriately describes the results of a manual SQL Tuning Advisor task?（）

• A、A list of SQL statements and recommendations for tuning
• B、A list of SQL statements that have been tuned by the Advisor, with before and after metrics
• C、Graphs showing the actual performance improvement made by the Advisor after it implemented the recommended changes
• D、All of the above

第10题：

You are maintaining the PROD database of NetFx Corporation. You set the value of the SQL_TRACE parameter to TRUE. What will be the impact of this setting？（）  

• A、 The SQL trace facility will generate the performance statistics for all the SQL statements for an instance and write them in the USER_DUMP_DEST directory.
• B、 The SQL trace facility will generate the performance statistics for all the SQL statements for a session and write them in the USER_DUMP_DEST directory.
• C、 The SQL trace facility will generate the performance statistics for all the SQL statements for an instance and write them in the BACKGROUND_DUMP_DEST directory.
• D、 The SQL trace facility will generate the performance statistics for all the SQL statements for a session and write them in the BACKGROUND_DUMP_DEST directory.