SET @global_start_value = @@global.timed_mutexes;
SELECT @global_start_value;
@global_start_value
0
'#--------------------FN_DYNVARS_177_01------------------------#'
SET @@global.timed_mutexes = 1;
SET @@global.timed_mutexes = DEFAULT;
SELECT @@global.timed_mutexes;
@@global.timed_mutexes
0
'#---------------------FN_DYNVARS_177_02-------------------------#'
SET timed_mutexes = 1;
ERROR HY000: Variable 'timed_mutexes' is a GLOBAL variable and should be set with SET GLOBAL
SELECT @@timed_mutexes;
@@timed_mutexes
0
SELECT global.timed_mutexes;
ERROR 42S02: Unknown table 'global' in field list
SET global timed_mutexes = 1;
SELECT @@global.timed_mutexes;
@@global.timed_mutexes
1
'#--------------------FN_DYNVARS_177_03------------------------#'
SET @@global.timed_mutexes = 0;
SELECT @@global.timed_mutexes;
@@global.timed_mutexes
0
SET @@global.timed_mutexes = 1;
SELECT @@global.timed_mutexes;
@@global.timed_mutexes
1
'#--------------------FN_DYNVARS_177_04-------------------------#'
SET @@global.timed_mutexes = -1;
ERROR 42000: Variable 'timed_mutexes' can't be set to the value of '-1'
SET @@global.timed_mutexes = 2;
ERROR 42000: Variable 'timed_mutexes' can't be set to the value of '2'
SET @@global.timed_mutexes = "T";
ERROR 42000: Variable 'timed_mutexes' can't be set to the value of 'T'
SET @@global.timed_mutexes = "Y";
ERROR 42000: Variable 'timed_mutexes' can't be set to the value of 'Y'
SET @@global.timed_mutexes = _true;
ERROR 42000: Variable 'timed_mutexes' can't be set to the value of '_true'
SET @@global.timed_mutexes = 0N;
ERROR 42000: Variable 'timed_mutexes' can't be set to the value of '0N'
SET @@global.timed_mutexes = 1+1;
ERROR 42000: Variable 'timed_mutexes' can't be set to the value of '2'
SET @@global.timed_mutexes = 0FF;
ERROR 42000: Variable 'timed_mutexes' can't be set to the value of '0FF'
SET @@global.timed_mutexes = '0';
ERROR 42000: Variable 'timed_mutexes' can't be set to the value of '0'
SET @@global.timed_mutexes = N;
ERROR 42000: Variable 'timed_mutexes' can't be set to the value of 'N'
'#-------------------FN_DYNVARS_177_05----------------------------#'
SET @@session.timed_mutexes = 0;
ERROR HY000: Variable 'timed_mutexes' is a GLOBAL variable and should be set with SET GLOBAL
SET @@timed_mutexes = 0;
ERROR HY000: Variable 'timed_mutexes' is a GLOBAL variable and should be set with SET GLOBAL
SET @@local.timed_mutexes = 0;
ERROR HY000: Variable 'timed_mutexes' is a GLOBAL variable and should be set with SET GLOBAL
SELECT @@session.timed_mutexes;
ERROR HY000: Variable 'timed_mutexes' is a GLOBAL variable
SELECT @@local.timed_mutexes;
ERROR HY000: Variable 'timed_mutexes' is a GLOBAL variable
'#----------------------FN_DYNVARS_177_06------------------------#'
SELECT count(VARIABLE_VALUE) FROM INFORMATION_SCHEMA.SESSION_VARIABLES 
WHERE VARIABLE_NAME='timed_mutexes';
count(VARIABLE_VALUE)
1
'#----------------------FN_DYNVARS_177_07------------------------#'
SELECT @@global.timed_mutexes = VARIABLE_VALUE
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES 
WHERE VARIABLE_NAME='timed_mutexes';
@@global.timed_mutexes = VARIABLE_VALUE
0
SELECT @@global.timed_mutexes;
@@global.timed_mutexes
1
SELECT VARIABLE_VALUE 
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES 
WHERE VARIABLE_NAME='timed_mutexes';
VARIABLE_VALUE
ON
'#---------------------FN_DYNVARS_177_08-------------------------#'
SET @@global.timed_mutexes = OFF;
SELECT @@global.timed_mutexes;
@@global.timed_mutexes
0
SET @@global.timed_mutexes = ON;
SELECT @@global.timed_mutexes;
@@global.timed_mutexes
1
'#---------------------FN_DYNVARS_177_09----------------------#'
SET @@global.timed_mutexes = TRUE;
SELECT @@global.timed_mutexes;
@@global.timed_mutexes
1
SET @@global.timed_mutexes = FALSE;
SELECT @@global.timed_mutexes;
@@global.timed_mutexes
0
SET @@global.timed_mutexes = @global_start_value;
SELECT @@global.timed_mutexes;
@@global.timed_mutexes
0