SET @start_global_value = @@global.max_write_lock_count;
SELECT @start_global_value;
@start_global_value
4294967295
'#--------------------FN_DYNVARS_088_01-------------------------#'
SET @@global.max_write_lock_count = 1000;
SET @@global.max_write_lock_count = DEFAULT;
SELECT @@global.max_write_lock_count;
@@global.max_write_lock_count
4294967295
'#--------------------FN_DYNVARS_088_02-------------------------#'
SET @@global.max_write_lock_count = DEFAULT;
SELECT @@global.max_write_lock_count = 4294967295;
@@global.max_write_lock_count = 4294967295
1
'#--------------------FN_DYNVARS_088_03-------------------------#'
SET @@global.max_write_lock_count = 1;
SELECT @@global.max_write_lock_count;
@@global.max_write_lock_count
1
SET @@global.max_write_lock_count = 2;
SELECT @@global.max_write_lock_count;
@@global.max_write_lock_count
2
SET @@global.max_write_lock_count = 65536;
SELECT @@global.max_write_lock_count;
@@global.max_write_lock_count
65536
SET @@global.max_write_lock_count = 4294967295;
SELECT @@global.max_write_lock_count;
@@global.max_write_lock_count
4294967295
SET @@global.max_write_lock_count = 4294967294;
SELECT @@global.max_write_lock_count;
@@global.max_write_lock_count
4294967294
'#------------------FN_DYNVARS_088_04-----------------------#'
SET @@global.max_write_lock_count = -1024;
Warnings:
Warning	1292	Truncated incorrect max_write_lock_count value: '-1024'
SELECT @@global.max_write_lock_count;
@@global.max_write_lock_count
1
SET @@global.max_write_lock_count = 4294967296;
Warnings:
Warning	1292	Truncated incorrect max_write_lock_count value: '4294967296'
SELECT @@global.max_write_lock_count;
@@global.max_write_lock_count
4294967295
SET @@global.max_write_lock_count = -1;
Warnings:
Warning	1292	Truncated incorrect max_write_lock_count value: '-1'
SELECT @@global.max_write_lock_count;
@@global.max_write_lock_count
1
SET @@global.max_write_lock_count = 429496729500;
Warnings:
Warning	1292	Truncated incorrect max_write_lock_count value: '429496729500'
SELECT @@global.max_write_lock_count;
@@global.max_write_lock_count
4294967295
SET @@global.max_write_lock_count = 65530.34;
ERROR 42000: Incorrect argument type to variable 'max_write_lock_count'
SELECT @@global.max_write_lock_count;
@@global.max_write_lock_count
4294967295
SET @@global.max_write_lock_count = test;
ERROR 42000: Incorrect argument type to variable 'max_write_lock_count'
SELECT @@global.max_write_lock_count;
@@global.max_write_lock_count
4294967295
'#------------------FN_DYNVARS_088_05-----------------------#'
SELECT @@global.max_write_lock_count = VARIABLE_VALUE 
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES 
WHERE VARIABLE_NAME='max_write_lock_count';
@@global.max_write_lock_count = VARIABLE_VALUE
1
'#------------------FN_DYNVARS_088_06-----------------------#'
SET @@global.max_write_lock_count = TRUE;
SELECT @@global.max_write_lock_count;
@@global.max_write_lock_count
1
SET @@global.max_write_lock_count = FALSE;
Warnings:
Warning	1292	Truncated incorrect max_write_lock_count value: '0'
SELECT @@global.max_write_lock_count;
@@global.max_write_lock_count
1
'#---------------------FN_DYNVARS_088_07----------------------#'
SET @@global.max_write_lock_count = 20;
SELECT @@max_write_lock_count = @@global.max_write_lock_count;
@@max_write_lock_count = @@global.max_write_lock_count
1
'#---------------------FN_DYNVARS_088_08----------------------#'
SET @@global.max_write_lock_count = 102;
SELECT @@max_write_lock_count;
@@max_write_lock_count
102
SELECT local.max_write_lock_count;
ERROR 42S02: Unknown table 'local' in field list
SELECT global.max_write_lock_count;
ERROR 42S02: Unknown table 'global' in field list
SELECT max_write_lock_count = @@global.max_write_lock_count;
ERROR 42S22: Unknown column 'max_write_lock_count' in 'field list'
SET @@global.max_write_lock_count = @start_global_value;
SELECT @@global.max_write_lock_count;
@@global.max_write_lock_count
4294967295
