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On your Oracle Database, you issue the following commands to create indexes:SQL > CREATE INDEX oe.ord_customer_ix1 ON oe.orders (customer_id, sales_rep_id) INVISIBLE;SQL> CREATE BITMAP INDEX oe.ord_customer_ix2 ON oe.orders (customer_id, sales_rep_id);Whi

题目

On your Oracle Database, you issue the following commands to create indexes:SQL > CREATE INDEX oe.ord_customer_ix1 ON oe.orders (customer_id, sales_rep_id) INVISIBLE;SQL> CREATE BITMAP INDEX oe.ord_customer_ix2 ON oe.orders (customer_id, sales_rep_id);Which two statements are true?（）

A. Only the ORD_CUSTOMER_IX1 index created.

B. Both the indexes are updated when a row is inserted, updated, or deleted in the ORDERS table.

C. Both the indexes are created: however, only ORD_CUSTOMERS_IX1 is used by the optimizer for queries on the ORDERS table.

D. The ORD_CUSTOMER_IX1 index is not used by the optimizer even when the OPTIMIZER_USE_INVISIBLE_INDEXES parameters is set to true.

E. Both the indexes are created and used by the optimizer for queries on the ORDERS table.

F. Both the indexes are created: however, only ORD_CUSTOMERS_IX2 is used by the optimizer for queries on the ORDERS table.

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  • 第1题：

    Oracle密码允许包含像“SELECT”，“DELETE”，“CREATE”这类的Oracle/SQL关键字。()


    答案：错误

  • 第2题：

    ORACLE初始化参数文件的默认路径是:()

    A.对于UNIX，在$ORACLE_HOME/dbs

    B.对于UNIX，在$ORACLE_HOME/dbs/admin

    C.对于Linux，在%ORACLE_HOME%\database

    D.对于Windows，在%ORACLE_HOME%\dbs

    E.对于Windows，在%ORACLE_HOME%\database\admin


    参考答案：A

  • 第3题：

    下列四组SQL命令，全部属于数据定义语句的命令是（）

    A．CREATE，DROP，UPDATE

    B．CREATE，DROP，ALTER

    C．CREATE，DROP，GRANT

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    CREATE ， DROP ， ALTER

  • 第4题：

    Oracle9iprovidesadatabasepackagecalleddbms_redefinitiontoperformanonlinerebuildofatable.Whichtwostepsareyourecommendedtodopriortoissuingthedbms_redefinition_start_redeftableprocedurecall?()

    A.Grandprivilegesontheinterimtable.

    B.Invokethedbms_redefinition.can_redef_tableprocedure.

    C.Invokethedbms_redefinition.sync_interim_tableprocedure.

    D.Createanytriggers，indexes，orconstraintsontheinterimtable.

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    参考答案：B, E

  • 第5题：

    （ ） – Is Miss White __________ English teacher, Maria?

    – No, she teaches __________ geography.

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    正确答案：D

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    下列哪组SQL命令全部属于数据定义语句的命令？（）

    A．CREATE，DROP，ALTER

    B．CREATE，DROP，SELECT

    C．CREATE，DROP，GRANT

    D．CREATE，DROP，UPDATE


    CREATE，DROP，ALTER

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