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set session debug_dbug="L";
select @@global.debug_dbug="1";
@@global.debug_dbug="1"
0
select @@session.debug_dbug;
@@session.debug_dbug
L
show global variables like 'debug_dbug';
Variable_name Value
debug_dbug #
show session variables like 'debug_dbug';
Variable_name Value
debug_dbug L
select * from information_schema.global_variables where variable_name='debug_dbug';
VARIABLE_NAME VARIABLE_VALUE
DEBUG_DBUG #
select * from information_schema.session_variables where variable_name='debug_dbug';
VARIABLE_NAME VARIABLE_VALUE
DEBUG_DBUG L
set @@global.debug_dbug=1;
ERROR 42000: Incorrect argument type to variable 'debug_dbug'
set @@global.debug_dbug=1.1;
ERROR 42000: Incorrect argument type to variable 'debug_dbug'
set @@global.debug_dbug=1e1;
ERROR 42000: Incorrect argument type to variable 'debug_dbug'
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