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多选题Which statements are correct regarding indexes？ （）AWhen a table is dropped， the corresponding indexes are automatically dropped.BFor each DML operation performed， the corresponding indexes are automatically updated.CIndexes should be created on columns

题目
多选题
Which statements are correct regarding indexes？ （）
A

When a table is dropped， the corresponding indexes are automatically dropped.

B

For each DML operation performed， the corresponding indexes are automatically updated.

C

Indexes should be created on columns that are frequently referenced as part of an expression.

D

A non-deferrable PRIMARY KEY or UNIQUE KEY constraint in a table automatically creates a uniqueindex.

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相似问题和答案

第1题：

Which two statements regarding the Flashback Table feature are correct?()

A. Flashback Table can be performed on system tables.

B. Flashback Table operation does not shrink the segments.

C. Flashback Table uses log mining to extract SQL_REDO and SQL_UNDO statements.

D. Flashback Table operation acquires exclusive data manipulation language (DML) locks.


参考答案：B, D

第2题：

The RECYCLEBIN parameter is set to ON for your database. You drop a table, PRODUCTS, from the SCOTT schema. Which two statements are true regarding the outcome of this action? （）(Choose two)

  • A、All the related indexes and views are automatically dropped
  • B、The flashback drop feature can recover only the table structure
  • C、Only the related indexes are dropped whereas views are invalidated
  • D、The flashback drop feature can recover both the table structure and its data

正确答案:C,D

第3题：

The RECYCLEBIN parameter is set to ON for your database. You drop a table, PRODUCTS, from the SCOTT schema.Which two statements are true regarding the outcome of this action?()

A. All the related indexes and views are automatically dropped

B. The flashback drop feature can recover only the table structure

C. Only the related indexes are dropped whereas views are invalidated

D. The flashback drop feature can recover both the table structure and its data


参考答案：C, D

第4题：

Which statements are correct regarding indexes？ （）

  • A、 When a table is dropped， the corresponding indexes are automatically dropped.
  • B、 For each DML operation performed， the corresponding indexes are automatically updated.
  • C、 Indexes should be created on columns that are frequently referenced as part of an expression.
  • D、 A non-deferrable PRIMARY KEY or UNIQUE KEY constraint in a table automatically creates a uniqueindex.

正确答案:A,B,D

第5题：

Which two statements are TRUE regarding Coherence Indexes ？ （）

  • A、 indexes are maintained by cache entry ownes
  • B、 an application should not suggest an index that another aplication had suggested
  • C、 indexes cannot be sorted
  • D、 each application using Coherence may suggest the same set of indexes when it starts

正确答案:A,D

第6题：

Which two statements are true regarding views?（）

  • A、A subquery that defines a view cannot include the GROUP BY clause 
  • B、A view that is created with the subquery having the DISTINCT keyword can be updated 
  • C、A view that is created with the subquery having the pseudo column ROWNUM keyword cannot be updated 
  • D、A data manipulation language (DML) operation can be performed on a view that is created with the subquery having all the NOT NULL columns of a table

正确答案:C,D

第7题：

Which  statements are correct about temporary tables（）

  • A、Indexes and views can be created on temporary tables.
  • B、Both the data and the structure of temporary tables can be exported.
  • C、Temporary tables are always created in a user’s temporary tablespace.
  • D、The data inserted into a temporary table in a session is available to other sessions.
  • E、Data manipulation language （DML） locks are never acquired on the data of temporary tables

正确答案:A,C,E

第8题：

You issued the following command:An index is then created on the ADMIN_WORK_AREA temporary table. Which two statements are true regarding the TBS_T1 tablespace in the above command? ()

A. It stores only the temporary table but not its indexes.

B. It stores both the temporary table as well as its indexes.

C. It must be a nondefault temporary tablespace for the database.

D. It can be a default or nondefault temporary tablespace for the database.

E. It must be the default temporary tablespace of the user who issues the command.


参考答案：B, D

第9题：

Which statements are true regarding system-partitioned tables？（）  

  • A、 Only a single partitioning key column can be specified.
  • B、 All DML statements must use partition-extended syntax.
  • C、 The same physical attributes must be specified for each partition.
  • D、 Unique local indexes cannot be created on a system-partitioned table.
  • E、 Traditional partition pruning and partitionwise joins are not supported on these tables.

正确答案:D,E

第10题：

Which statement is true regarding online redefinition for the migration of BasicFile LOBs to SecureFile LOBs?（）

  • A、It cannot be done in parallel.
  • B、It can be done at the table level or partition level.
  • C、It does not require additional storage because the operation is done online.
  • D、Local and global indexes are maintained automatically during the operation.

正确答案:B

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