select @@global.rpl_semi_sync_slave_trace_level;
@@global.rpl_semi_sync_slave_trace_level
32
SET @start_global_value = @@global.rpl_semi_sync_slave_trace_level;
select @@global.rpl_semi_sync_slave_trace_level in (1,16,32,64);
@@global.rpl_semi_sync_slave_trace_level in (1,16,32,64)
1
select @@session.rpl_semi_sync_slave_trace_level;
ERROR HY000: Variable 'rpl_semi_sync_slave_trace_level' is a GLOBAL variable
show global variables like 'rpl_semi_sync_slave_trace_level';
Variable_name	Value
rpl_semi_sync_slave_trace_level	32
show session variables like 'rpl_semi_sync_slave_trace_level';
Variable_name	Value
rpl_semi_sync_slave_trace_level	32
select * from information_schema.global_variables where variable_name='rpl_semi_sync_slave_trace_level';
VARIABLE_NAME	VARIABLE_VALUE
RPL_SEMI_SYNC_SLAVE_TRACE_LEVEL	32
select * from information_schema.session_variables where variable_name='rpl_semi_sync_slave_trace_level';
VARIABLE_NAME	VARIABLE_VALUE
RPL_SEMI_SYNC_SLAVE_TRACE_LEVEL	32
set global rpl_semi_sync_slave_trace_level=16;
set session rpl_semi_sync_slave_trace_level=99;
ERROR HY000: Variable 'rpl_semi_sync_slave_trace_level' is a GLOBAL variable and should be set with SET GLOBAL
select @@global.rpl_semi_sync_slave_trace_level;
@@global.rpl_semi_sync_slave_trace_level
16
select @@session.rpl_semi_sync_slave_trace_level;
ERROR HY000: Variable 'rpl_semi_sync_slave_trace_level' is a GLOBAL variable
show global variables like 'rpl_semi_sync_slave_trace_level';
Variable_name	Value
rpl_semi_sync_slave_trace_level	16
show session variables like 'rpl_semi_sync_slave_trace_level';
Variable_name	Value
rpl_semi_sync_slave_trace_level	16
select * from information_schema.global_variables where variable_name='rpl_semi_sync_slave_trace_level';
VARIABLE_NAME	VARIABLE_VALUE
RPL_SEMI_SYNC_SLAVE_TRACE_LEVEL	16
select * from information_schema.session_variables where variable_name='rpl_semi_sync_slave_trace_level';
VARIABLE_NAME	VARIABLE_VALUE
RPL_SEMI_SYNC_SLAVE_TRACE_LEVEL	16
NOTE: Value can also be set to values that are combinations of values
set global rpl_semi_sync_slave_trace_level=42;
select @@global.rpl_semi_sync_slave_trace_level;
@@global.rpl_semi_sync_slave_trace_level
42
select @@session.rpl_semi_sync_slave_trace_level;
ERROR HY000: Variable 'rpl_semi_sync_slave_trace_level' is a GLOBAL variable
show global variables like 'rpl_semi_sync_slave_trace_level';
Variable_name	Value
rpl_semi_sync_slave_trace_level	42
show session variables like 'rpl_semi_sync_slave_trace_level';
Variable_name	Value
rpl_semi_sync_slave_trace_level	42
select * from information_schema.global_variables where variable_name='rpl_semi_sync_slave_trace_level';
VARIABLE_NAME	VARIABLE_VALUE
RPL_SEMI_SYNC_SLAVE_TRACE_LEVEL	42
select * from information_schema.session_variables where variable_name='rpl_semi_sync_slave_trace_level';
VARIABLE_NAME	VARIABLE_VALUE
RPL_SEMI_SYNC_SLAVE_TRACE_LEVEL	42
set global rpl_semi_sync_slave_trace_level=1.1;
ERROR 42000: Incorrect argument type to variable 'rpl_semi_sync_slave_trace_level'
set global rpl_semi_sync_slave_trace_level=1e1;
ERROR 42000: Incorrect argument type to variable 'rpl_semi_sync_slave_trace_level'
set global rpl_semi_sync_slave_trace_level="some text";
ERROR 42000: Incorrect argument type to variable 'rpl_semi_sync_slave_trace_level'
SET @@global.rpl_semi_sync_slave_trace_level = @start_global_value;
select @@global.rpl_semi_sync_slave_trace_level;
@@global.rpl_semi_sync_slave_trace_level
32