多选题Which two statements are true about simple views？（）AViews can be created as read only.BViews are data segments like tables.CViews can be created on the basis of more than one table.DData manipulation language （DML） operations cannot be performed on vie

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多选题

Which two statements are true about simple views？（）

Views can be created as read only.

Views are data segments like tables.

Views can be created on the basis of more than one table.

Data manipulation language （DML） operations cannot be performed on views.

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Which two statements regarding a SQL profile are true?()A. It is built by Automatic Tuning Optimizer.B. It cannot be stored persistently in the data dictionary.C. It can be used by the query optimizer automatically.D. It can be created manually by using the CREATE PROFILE command.

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第2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.

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第3题

Which two statements correctly describe the relation between a data file and the logical databasestructures（）A、An extent cannot spread across data files.B、A segment cannot spread across data files.C、A data file can belong to only one tablespace.D、A data file can have only one segment created in it.E、A data block can spread across multiple data files as it can consist of multiple operating system （OS） blocks.

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第4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

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第5题

ENCRYPT_TS is an encrypted tablespace that contains tables with data. Which statement is true regarding the effect of queries and data manipulation language (DML) statements on the encrypted data in the tables?（）A、The data is decrypted during SORT and JOIN operations.B、The data remains encrypted when it is read into memory.C、The data remains encrypted when it is stored in the redo logs.D、The data remains encrypted in the UNDO tablespace provided that the UNDO tablespace was created with the encryption option enabled.

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第6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

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第7题

Which two statements regarding a SQL profile are true？（）A、 It is built by Automatic Tuning Optimizer.B、 It cannot be stored persistently in the data dictionary.C、 It can be used by the query optimizer automatically.D、 It can be created manually by using the CREATE PROFILE command.

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多选题Which two statements are true about simple views？（）AViews can be created as read only.BViews are data segments like tables.CViews can be created on the basis of more than one table.DData manipulation language （DML） operations cannot be performed on vie

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