oracle ¸ü¸Ä²ÎÊý nls_length_semantics
alter system set nls_length_semantics='BYTE' scope=both
sql>show parameter length
NAME TYPE
------------------------------------ ----------------------
VALUE
------------------------------
nls_length_semantics string
BYTE
SQL> select value from nls_database_parameters where parameter='NLS_LENGTH_SEMANTICS';
VALUE
--------------------------------------------------------------------------------
CHAR
sql>show parameter length
NAME TYPE
------------------------------------ ----------------------
VALUE
------------------------------
nls_length_semantics string
BYTE
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