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多选题
In a design situation, there are multiple character sets that can properly encode your data. Which three should influence your choice of character set?（）
A
Syntax when writing queries involving JOINS
B
Memory usage when working with the data
C
Character set mapping index hash size
D
Disk usage when storing data
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单选题In a database with the database character set of US7ASCII and a national character set of UTF-8, which datatypes would be capable of storing Unicode data by default?（）A
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NVARCHAR2D
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单选题Automatic data conversion will occur if which of the following happens？（）A
The client and server have different NLS_LANGUAGE settingsB
The client and server character sets are not the same，and the database character set is not a strict superset of the client character setC
The client and server are in different time zonesD
The client requests automatic data conversionE
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单选题You are maintaining your database in Oracle10g. You find that the number of languages that should be supported in your database has increased. The character set of your database is UTF8. You decide to migrate your database to the AL16UTF16 national character set. How will you migrate your database from UTF8 to AL16UTF16？（）A
by using the RMAN utilityB
by using the export/import utilityC
by using the ALTER DATABASE commandD
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单选题Automatic data conversion will occur if which of the following happens?（）A
The client and server have different NLS_LANGUAGE settings.B
The client and server character sets are not the same, and the database character set is not a strict superset of the client character set.C
The client and server are in different time zones.D
The client requests automatic data conversion.E
The AUTO_CONVERT initialization parameter is set to TRUE.
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