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

题目
多选题
Which three statements are true about SQL plan directives?（）
A

They are tied to a specific statement or SQL id.

B

They instruct the maintenance job to collect missing statistics or perform dynamic sampling to generate a more optimal plan.

C

They are used to gather only missing statistics.

D

They are created for a query expression where statistics are missing or the cardinality estimates by the optimizer are incorrect.

E

They instruct the optimizer to create only column group statistics.

F

Improve plan accuracy by persisting both compilation and execution statistics in the SYSAUX tablespace.

相似考题

1.You want to analyze a SQL Tuning Set (STS) using SQL Performance Analyzer in a test database. Which two statements are true regarding the activities performed during the test execution of SQLs in a SQL Tuning Set?（）A.Every SQL statement in the STS is considered only once for executionB.The SQL statements in the STS are executed concurrently to produce the execution plan and execution statisticsC.The execution plan and execution statistics are computed for each SQL statement in the STSD.The effects of DDL and DML are considered to produce the execution plan and execution statistics

2.Which three statements are true about SQL plan directives?()A. They are tied to a specific statement or SQL id.B. They instruct the maintenance job to collect missing statistics or perform dynamic sampling to generate a more optimal plan.C. They are used to gather only missing statistics.D. They are created for a query expression where statistics are missing or the cardinality estimates by the optimizer are incorrect.E. They instruct the optimizer to create only column group statistics.F. Improve plan accuracy by persisting both compilation and execution statistics in the SYSAUX tablespace.

3.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.

4.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.

更多“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 ”相关问题

  • 第1题：

    To make audit information more productive， the DBA executes the following command before startingan audit operation：  SQL> ALTER SYSTEM SET AUDIT_TRAIL=DB，EXTENDED SCOPE=SPFILE；  Which statement is true regarding the audit record generated when auditing starts after restarting thedatabase（）

    • A、It contains only the plan for the SQL statement executed by the user.
    • B、It contains the SQL text executed by the user and the bind variables used with it.
    • C、It contains the plan and statistics associated with the SQL statement executed by the user.
    • D、It contains the plan for the SQL statement executed by the user and the bind variables used with it.

    正确答案:B

  • 第2题：

    Which two statements about subqueries are true? （）

    • A、A subquery should retrieve only one row.
    • B、A subquery can retrieve zero or more rows.
    • C、A subquery can be used only in SQL query statements.
    • D、Subqueries CANNOT be nested by more than two levels.
    • E、A subquery CANNOT be used in an SQL query statement that uses group functions.
    • F、When a subquery is used with an inequality comparison operator in the outer SQL statement, the column list in the SELECT clause of the subquery should contain only one column.

    正确答案:B,F

  • 第3题：

    Which statement is true when you run the SQL Tuning Advisor with limited scope？（）

    • A、Access path analysis is not performed for the SQL statements.
    • B、SQL structure analysis is not performed for the SQL statements.
    • C、SQL Profile recommendations are not generated for the SQL statements.
    • D、The staleness and absence of the statistics are not checked for the objects in the query supplied to the SQL Tuning Advisor.

    正确答案:C

  • 第4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.

    正确答案:A,D,E

  • 第5题：

    Examine the parameters for your database instance: Which three statements are true about the process of automatic optimization by using cardinality feedback?（）

    • A、The optimizer automatically changes a plan during subsequent execution of a SQL statement if there is a huge difference in optimizer estimates and execution statistics.
    • B、The optimizer can re optimize a query only once using cardinality feedback.
    • C、The optimizer enables monitoring for cardinality feedback after the first execution of a query.
    • D、The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
    • E、After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors are submitted to the optimizer.

    正确答案:A,C,D

  • 第6题：

    多选题
    Which two statements about the SQL Management Base (SMB) are true?（）
    A

    It contains only SQL profiles generated by SQL Tuning Advisor.

    B

    It stores plans generated by the optimizer using a stored outline.

    C

    It is part of the data dictionary and stored in the SYSAUX tablespace.

    D

    It is part of the data dictionary and stored in the SYSTEM tablespace.

    E

    It contains the statement log, the plan history, plan baselines, and SQL profiles.


    正确答案： D,B
    解析： 暂无解析

  • 第7题：

    多选题
    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.


    正确答案： B,E
    解析： 暂无解析

  • 第8题：

    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.


    正确答案： C,D
    解析： 暂无解析

  • 第9题：

    单选题
    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.


    正确答案： C
    解析： 暂无解析

  • 第10题：

    多选题
    Which three features work together, to allow a SQL statement to have different cursors for the samestatement based on different selectivity ranges?（）
    A

    Bind Variable Peeking

    B

    SQL Plan Baselines

    C

    Adaptive Cursor Sharing

    D

    Bind variable used in a SQL statement

    E

    Literals in a SQL statement


    正确答案： C,B
    解析： 暂无解析

  • 第11题：

    多选题
    Which three are the valid statements in relation to SQL plan baselines?（）
    A

    The plans can be manually loaded to the SQL plan baseline.

    B

    The plans in the SQL plan baseline are verified and accepted plans.

    C

    The plans generated for every SQL statement are stored in the SQL plan baseline by default.

    D

    The 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.


    正确答案： A,B,E
    解析： 暂无解析

  • 第12题：

    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?（）
    A

    The optimizer automatically changes a plan during subsequent execution of a SQL statement if there is a huge difference in optimizer estimates and execution statistics.

    B

    The optimizer can re optimize a query only once using cardinality feedback.

    C

    The optimizer enables monitoring for cardinality feedback after the first execution of a query.

    D

    The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.

    E

    After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors are submitted to the optimizer.


    正确答案： C,B
    解析： 暂无解析

  • 第13题：

    Which three features work together, to allow a SQL statement to have different cursors for the samestatement based on different selectivity ranges?（）

    • A、Bind Variable Peeking
    • B、SQL Plan Baselines
    • C、Adaptive Cursor Sharing
    • D、Bind variable used in a SQL statement
    • E、Literals in a SQL statement

    正确答案:A,C,E

  • 第14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.

    正确答案:A

  • 第15题：

    You want to analyze a SQL Tuning Set （STS） using SQL Performance Analyzer in a test database. Which two statements are true regarding the activities performed during the test execution of SQLs in a SQL Tuning Set？（）

    • A、 Every SQL statement in the STS is considered only once for execution.
    • B、 The SQL statements in the STS are executed concurrently to produce the execution plan and execution statistics.
    • C、 The execution plan and execution statistics are computed for each SQL statement in the STS. 
    • D、 The effects of DDL and DML are considered to produce the execution plan and execution statistics.

    正确答案:A,C

  • 第16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.

    正确答案:A,B,D

  • 第17题：

    You want to analyze a SQL Tuning Set (STS) using SQL Performance Analyzer in a test database. Which two statements are true regarding the activities performed during the test execution of SQLs in a SQL Tuning Set?（）

    • A、Every SQL statement in the STS is considered only once for execution
    • B、The SQL statements in the STS are executed concurrently to produce the execution plan and execution statistics
    • C、The execution plan and execution statistics are computed for each SQL statement in the STS
    • D、The effects of DDL and DML are considered to produce the execution plan and execution statistics

    正确答案:A,C

  • 第18题：

    多选题
    You want to analyze a SQL Tuning Set (STS) using SQL Performance Analyzer in a test database. Which two statements are true regarding the activities performed during the test execution of SQLs in a SQL Tuning Set?（）
    A

    Every SQL statement in the STS is considered only once for execution

    B

    The SQL statements in the STS are executed concurrently to produce the execution plan and execution statistics

    C

    The execution plan and execution statistics are computed for each SQL statement in the STS

    D

    The effects of DDL and DML are considered to produce the execution plan and execution statistics


    正确答案： A,B
    解析： 暂无解析

  • 第19题：

    单选题
    Which statement is true when you run the SQL Tuning Advisor with limited scope？（）
    A

    Access path analysis is not performed for the SQL statements.

    B

    SQL structure analysis is not performed for the SQL statements.

    C

    SQL Profile recommendations are not generated for the SQL statements.

    D

    The staleness and absence of the statistics are not checked for the objects in the query supplied to the SQL Tuning Advisor.


    正确答案： B
    解析： 暂无解析

  • 第20题：

    多选题
    Which three statements are true about SQL plan directives?（）
    A

    They are tied to a specific statement or SQL id.

    B

    They instruct the maintenance job to collect missing statistics or perform dynamic sampling to generate a more optimal plan.

    C

    They are used to gather only missing statistics.

    D

    They are created for a query expression where statistics are missing or the cardinality estimates by the optimizer are incorrect.

    E

    They instruct the optimizer to create only column group statistics.

    F

    Improve plan accuracy by persisting both compilation and execution statistics in the SYSAUX tablespace.


    正确答案： B,D,E
    解析： 暂无解析

  • 第21题：

    多选题
    Which two statements about subqueries are true? （）
    A

    A subquery should retrieve only one row.

    B

    A subquery can retrieve zero or more rows.

    C

    A subquery can be used only in SQL query statements.

    D

    Subqueries CANNOT be nested by more than two levels.

    E

    A subquery CANNOT be used in an SQL query statement that uses group functions.

    F

    When a subquery is used with an inequality comparison operator in the outer SQL statement, the column list in the SELECT clause of the subquery should contain only one column.


    正确答案： C,D
    解析： 暂无解析

  • 第22题：

    多选题
    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.


    正确答案： C,E
    解析： 暂无解析

  • 第23题：

    单选题
    To make audit information more productive， the DBA executes the following command before startingan audit operation：  SQL> ALTER SYSTEM SET AUDIT_TRAIL=DB，EXTENDED SCOPE=SPFILE；  Which statement is true regarding the audit record generated when auditing starts after restarting thedatabase（）
    A

    It contains only the plan for the SQL statement executed by the user.

    B

    It contains the SQL text executed by the user and the bind variables used with it.

    C

    It contains the plan and statistics associated with the SQL statement executed by the user.

    D

    It contains the plan for the SQL statement executed by the user and the bind variables used with it.


    正确答案： B
    解析： 暂无解析

  • 第24题：

    多选题
    You want to analyze a SQL Tuning Set （STS） using SQL Performance Analyzer in a test database. Which two statements are true regarding the activities performed during the test execution of SQLs in a SQL Tuning Set？（）
    A

    Every SQL statement in the STS is considered only once for execution.

    B

    The SQL statements in the STS are executed concurrently to produce the execution plan and execution statistics.

    C

    The execution plan and execution statistics are computed for each SQL statement in the STS.

    D

    The effects of DDL and DML are considered to produce the execution plan and execution statistics.


    正确答案： D,B
    解析： 暂无解析

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