SET @start_global_value = @@global.log_slow_verbosity;
select @@global.log_slow_verbosity = @@session.log_slow_verbosity;
@@global.log_slow_verbosity = @@session.log_slow_verbosity
1
SET @@global.log_slow_verbosity="",@@session.log_slow_verbosity="";
show global variables like 'log_slow_verbosity';
Variable_name	Value
log_slow_verbosity	
show session variables like 'log_slow_verbosity';
Variable_name	Value
log_slow_verbosity	
select * from information_schema.global_variables where variable_name='log_slow_verbosity';
VARIABLE_NAME	VARIABLE_VALUE
LOG_SLOW_VERBOSITY	
select * from information_schema.session_variables where variable_name='log_slow_verbosity';
VARIABLE_NAME	VARIABLE_VALUE
LOG_SLOW_VERBOSITY	
set global log_slow_verbosity=1;
select @@global.log_slow_verbosity;
@@global.log_slow_verbosity
innodb
set session log_slow_verbosity=1;
select @@session.log_slow_verbosity;
@@session.log_slow_verbosity
innodb
set session log_slow_verbosity=1;
select @@session.log_slow_verbosity;
@@session.log_slow_verbosity
innodb
set session log_slow_verbosity=2;
select @@session.log_slow_verbosity;
@@session.log_slow_verbosity
query_plan
set session log_slow_verbosity=3;
select @@session.log_slow_verbosity;
@@session.log_slow_verbosity
innodb,query_plan
set session log_slow_verbosity=4;
select @@session.log_slow_verbosity;
@@session.log_slow_verbosity
explain
set session log_slow_verbosity=5;
select @@session.log_slow_verbosity;
@@session.log_slow_verbosity
innodb,explain
set session log_slow_verbosity=6;
select @@session.log_slow_verbosity;
@@session.log_slow_verbosity
query_plan,explain
set session log_slow_verbosity=7;
select @@session.log_slow_verbosity;
@@session.log_slow_verbosity
innodb,query_plan,explain
set session log_slow_verbosity='innodb';
select @@session.log_slow_verbosity;
@@session.log_slow_verbosity
innodb
set session log_slow_verbosity='query_plan';
select @@session.log_slow_verbosity;
@@session.log_slow_verbosity
query_plan
set session log_slow_verbosity='innodb,query_plan';
select @@session.log_slow_verbosity;
@@session.log_slow_verbosity
innodb,query_plan
set session log_slow_verbosity='explain';
select @@session.log_slow_verbosity;
@@session.log_slow_verbosity
explain
set session log_slow_verbosity='innodb,query_plan,explain';
select @@session.log_slow_verbosity;
@@session.log_slow_verbosity
innodb,query_plan,explain
set session log_slow_verbosity='';
select @@session.log_slow_verbosity;
@@session.log_slow_verbosity

set session log_slow_verbosity=1.1;
ERROR 42000: Incorrect argument type to variable 'log_slow_verbosity'
set session log_slow_verbosity=1e1;
ERROR 42000: Incorrect argument type to variable 'log_slow_verbosity'
set session log_slow_verbosity="foo";
ERROR 42000: Variable 'log_slow_verbosity' can't be set to the value of 'foo'
set session log_slow_verbosity=8;
ERROR 42000: Variable 'log_slow_verbosity' can't be set to the value of '8'
SET @@global.log_slow_verbosity = @start_global_value;