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SET @start_value = @@global.general_log_file;
SELECT @start_value;
@start_value
test.log
'#---------------------FN_DYNVARS_004_01-------------------------#'
SET @@global.general_log_file = DEFAULT;
SELECT @@global.general_log_file;
@@global.general_log_file
mysqld.log
'#--------------------FN_DYNVARS_004_02------------------------#'
SET @@global.general_log_file = mytest.log;
ERROR 42000: Incorrect argument type to variable 'general_log_file'
SET @@global.general_log_file = 12;
ERROR 42000: Incorrect argument type to variable 'general_log_file'
SET @@global.general_log_file = 'my.cnf';
ERROR 42000: Variable 'general_log_file' can't be set to the value of 'my.cnf'
SET @@global.general_log_file = '/tmp/my.cnf';
ERROR 42000: Variable 'general_log_file' can't be set to the value of '/tmp/my.cnf'
SET @@global.general_log_file = '.my.cnf';
ERROR 42000: Variable 'general_log_file' can't be set to the value of '.my.cnf'
SET @@global.general_log_file = 'my.cnf\0foo';
ERROR 42000: Variable 'general_log_file' can't be set to the value of 'my.cnf'
SET @@global.general_log_file = 'my.ini';
ERROR 42000: Variable 'general_log_file' can't be set to the value of 'my.ini'
'#----------------------FN_DYNVARS_004_03------------------------#'
SELECT @@global.general_log_file = VARIABLE_VALUE
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
WHERE VARIABLE_NAME='general_log_file';
@@global.general_log_file = VARIABLE_VALUE
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SET @@global.general_log_file= @start_value;
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