[单选]
You created an encrypted tablespace:
You then closed the encryption wallet because you were advised that this is secure.
Later in the day, you attempt to create the EMPLOYEES table in the SECURESPACE tablespace with the SALT option on the EMPLOYEE column.
Which is true about the result?（）

A . It creates the table successfully but does not encrypt any inserted data in the EMPNAME column because the wallet must be opened to encrypt columns with SALT.
B . It generates an error when creating the table because the wallet is closed.
C . It creates the table successfully, and encrypts any inserted data in the EMPNAME column because the wallet needs to be open only for tablespace creation.
D . It generates error when creating the table, because the salt option cannot be used with encrypted tablespaces.

Due to media failure you lost one of the data files belonging to the USERS tablespace， and the tablespace is not available to use. Which statement regarding the status of the database is true？（） The database remains open.。 The database gets dismounted.。 The database becomes read only.。 The database instance gets aborted.。 The database gets shut down automatically.。 The status of the database depends on the status of the USERS tablespace.。晶体三极管正常工作的基本条件是（）发射结加反向偏置、集电结正反向偏置。发射结加反向偏置、集电结加反向偏置。发射结加正向偏置、集电结加正向偏置。发射结加正向偏置、集电结加反向偏置。 You created a tabular report for the sales department to display each customer and the sales person assign to the customer. The data is sorted by customer using the order by clause in this query. This is department manager asks you to alter the report so that data is sorted by sales person rather than by customer. What is the best way to make the needed change?（） Recreate the query and default the layout. 。 Alter the query, default the layout and redo the boiler plates. 。 Query and manually change the layout to save the boiler plate. 。 Alter the query and make no further change.。 What is the result？（） The value "4" is printed at the command line.。 Compilation fails because of an error in line 5.。 Compilation fails because of an error in line 9.。 A NullPointerException occurs at runtime.。 A NumberFormatException occurs at runtime.。 An IllegalStateException occurs at runtime.。 In which two cases would you perform only consistent backup？（） You are working on a database where downtime is not tolerated.。 You are working on a database where downtime can be tolerated.。 You are working on a database that operates in ARCHIVELOG mode.。 You are working on a database that operates in NOARCHIVELOG mode.。 You are working on a database where all the tablespaces are locally managed.。 You are working on a database where control files and redo log files are multiplexed.。 You are working on a database where control files and redo log files are not multiplexed.。

You created an encrypted tablespace:
You then closed the encryption wallet because you were advised that this is secure.
Later in the day, you attempt to create the EMPLOYEES table in the SECURESPACE tablespace with the SALT option on the EMPLOYEE column.
Which is true about the result?（）

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