多选题Which three statements are true about adaptive SQL plan management?（）AIt automatically performs verification or evolves non-accepted plans, in COMPREHENSIVE mode when they perform better than existing accepted plans.BThe optimizer always uses the fixed plan, if the fixed plan exists in the plan baseline.CIt adds new, bettor plans automatically as fixed plans to the baseline.DThe non-accepted plans are automatically accepted and become usable by the optimizer if they perform better than the existing accepted plans.EThe non-accepted plans in a SQL plan baseline are automatically evolved, in COMPREHENSIVE mode, during the nightly maintenance window and a persistent verification report is generated.
多选题
Which three statements are true about adaptive SQL plan management?（）
A
It automatically performs verification or evolves non-accepted plans, in COMPREHENSIVE mode when they perform better than existing accepted plans.
B
The optimizer always uses the fixed plan, if the fixed plan exists in the plan baseline.
C
It adds new, bettor plans automatically as fixed plans to the baseline.
D
The non-accepted plans are automatically accepted and become usable by the optimizer if they perform better than the existing accepted plans.
E
The non-accepted plans in a SQL plan baseline are automatically evolved, in COMPREHENSIVE mode, during the nightly maintenance window and a persistent verification report is generated.
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多选题Which three statements are true about adaptive SQL plan management?（）AIt automatically performs verification or evolves non-accepted plans, in COMPREHENSIVE mode when they perform better than existing accepted plans.BThe optimizer always uses the fixed plan, if the fixed plan exists in the plan baseline.CIt adds new, bettor plans automatically as fixed plans to the baseline.DThe non-accepted plans are automatically accepted and become usable by the optimizer if they perform better than the existing accepted plans.EThe non-accepted plans in a SQL plan baseline are automatically evolved, in COMPREHENSIVE mode, during the nightly maintenance window and a persistent verification report is generated.
多选题Which three statements are true about SQL plan directives?（）AThey are tied to a specific statement or SQL id.BThey instruct the maintenance job to collect missing statistics or perform dynamic sampling to generate a more optimal plan.CThey are used to gather only missing statistics.DThey are created for a query expression where statistics are missing or the cardinality estimates by the optimizer are incorrect.EThey instruct the optimizer to create only column group statistics.FImprove plan accuracy by persisting both compilation and execution statistics in the SYSAUX tablespace.
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多选题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?（）AThe plan baselines can be evolved over time to produce better performance.BThe newly generated plans are directly placed into the SQL plan baseline without being verified.CThe new SQL statements initially run with the plans that are known to produce good performance under standard test configuration.DThe optimizer does not generate new plans for the SQL statements for which the SQL plan baseline has been imported.
单选题Examine the following PL/SQL block： SET SERVEROUTPUT ON SET LONG 10000 ECLARE report clob； BEGIN report ：= DBMS_SPM.EVOLVE_SQL_PLAN_BASELINE（）； DBMS_OUTPUT.PUT_LINE（report）； END； Which statement describes the effect of the execution of the above PL/SQL block？（）A The plan baselines are verified with the SQL profiles.B All fixed plan baselines are converted into nonfixed plan baselines.C All the nonaccepted SQL profiles are accepted into the plan baseline.D The nonaccepted plans in the SQL Management Base are verified with the existing plan baselines.
多选题Which three statements about performance analysis by SQL Performance Analyzer are true？（）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 is based on the size of the objects accessed.DIt generates recommendations to run SQL Tuning Advisor to tune regressed SQLs.EIt shows only the overall impact on workload and not the net SQL impact on workload.
多选题Which three are the valid statements in relation to SQL plan baselines?（）AThe plans can be manually loaded to the SQL plan baseline.BThe plans in the SQL plan baseline are verified and accepted plans.CThe plans generated for every SQL statement are stored in the SQL plan baseline by default.DThe plan baselines are stored temporarily in the memory as long as the database instance is running.E For the SQL plan baselines to be accessible to the optimizer, the SYSAUX tablespace must be online.
多选题Examine the parameters for your database instance: Which three statements are true about the process of automatic optimization by using cardinality feedback?（）AThe optimizer automatically changes a plan during subsequent execution of a SQL statement if there is a huge difference in optimizer estimates and execution statistics.BThe optimizer can re optimize a query only once using cardinality feedback.CThe optimizer enables monitoring for cardinality feedback after the first execution of a query.DThe optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.EAfter the optimizer identifies a query as a re-optimization candidate, statistics collected by thecollectors are submitted to the optimizer.