SET @start_global_value = @@global.thread_pool_max_threads;
select @@global.thread_pool_max_threads;
@@global.thread_pool_max_threads
65536
select @@session.thread_pool_max_threads;
ERROR HY000: Variable 'thread_pool_max_threads' is a GLOBAL variable
show global variables like 'thread_pool_max_threads';
Variable_name	Value
thread_pool_max_threads	65536
show session variables like 'thread_pool_max_threads';
Variable_name	Value
thread_pool_max_threads	65536
select * from information_schema.global_variables where variable_name='thread_pool_max_threads';
VARIABLE_NAME	VARIABLE_VALUE
THREAD_POOL_MAX_THREADS	65536
select * from information_schema.session_variables where variable_name='thread_pool_max_threads';
VARIABLE_NAME	VARIABLE_VALUE
THREAD_POOL_MAX_THREADS	65536
set global thread_pool_max_threads=1;
select @@global.thread_pool_max_threads;
@@global.thread_pool_max_threads
1
set global thread_pool_max_threads=65536;
select @@global.thread_pool_max_threads;
@@global.thread_pool_max_threads
65536
set session thread_pool_max_threads=1;
ERROR HY000: Variable 'thread_pool_max_threads' is a GLOBAL variable and should be set with SET GLOBAL
set global thread_pool_max_threads=1.1;
ERROR 42000: Incorrect argument type to variable 'thread_pool_max_threads'
set global thread_pool_max_threads=1e1;
ERROR 42000: Incorrect argument type to variable 'thread_pool_max_threads'
set global thread_pool_max_threads="foo";
ERROR 42000: Incorrect argument type to variable 'thread_pool_max_threads'
set global thread_pool_max_threads=0;
Warnings:
Warning	1292	Truncated incorrect thread_pool_max_threads value: '0'
select @@global.thread_pool_max_threads;
@@global.thread_pool_max_threads
1
set global thread_pool_max_threads=10000000000;
Warnings:
Warning	1292	Truncated incorrect thread_pool_max_threads value: '10000000000'
select @@global.thread_pool_max_threads;
@@global.thread_pool_max_threads
65536
SET @@global.thread_pool_max_threads = @start_global_value;