Well this is clear that A, B are correct
A > Single-byte character sets result in better performance than multibyte character sets, and they also are the most efficient in terms of space requirements.
Ref: https://docs.oracle.com/en/database/oracle/oracle-database/19/nlspg/choosing-character-set.html#GUID-BF26E01D-AB92-48FC-855A-69A5B3AF9A92
B> Unicode is a universal encoded character set that enables information from any language to be stored using a single character set.
Ref:https://docs.oracle.com/cd/B19306_01/server.102/b14225/ch6unicode.htm#:~:text=Unicode%20is%20a%20universal%20encoded%20character%20set%20that,been%20adopted%20by%20many%20software%20and%20hardware%20vendors.
A "Single-byte character sets result in better performance than multibyte character set" (Logic & Oracle 12.2 Docs Application Development)
B "Unicode is a universal encoded character set that enables information from any language to be stored using a single character set" (Oracle 10.2 docs)
Correct: A, B
A. True. Single-byte character sets result in better performance than multibyte character sets, and they also are the most efficient in terms of space requirements.
B. True. Unicode is a universal encoded character set that enables information from any language to be stored using a single character set.
C. False. you can chose other characters sets
D. False. Can use 7-bits and 8-bits encoding schemas
E. False. Single-byte character sets result in better performance than multibyte character sets, and they also are the most efficient in terms of space requirements.
F. False.Can use 7-bits and 8-bits encoding schemas
AE single byte characters are space inefficient and multibyte characters are fast [Japanese are checked whether they aer 1,2,3,4 bytes in utf8 but are stored internally as uniform of 2 bytes in utf16
B: incorrect
You should generally select the Unicode character set AL32UTF8, because it
supports most languages of the world.
C: incorrect
Starting from Oracle Database 12c Release 2, if you use Oracle Universal Installer or Database Configuration Assistant (DBCA) to create the database, then the default database character set is AL32UTF8.
A: correct
Single-byte character sets result in better performance than multibyte character sets, and they also are the most efficient in terms of space requirements.
E: incorrect
Single-byte character sets result in better performance than multibyte character sets, and they also are the most efficient in terms of space requirements.
Single-byte encoding schemes are classified as one of the following types:
7-bit encoding schemes
8-bit encoding schemes
DF: incorrect
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