1select @@global.myisam_block_size;
2@@global.myisam_block_size
31024
4select @@session.myisam_block_size;
5ERROR HY000: Variable 'myisam_block_size' is a GLOBAL variable
6show global variables like 'myisam_block_size';
7Variable_name	Value
8myisam_block_size	1024
9show session variables like 'myisam_block_size';
10Variable_name	Value
11myisam_block_size	1024
12select * from information_schema.global_variables where variable_name='myisam_block_size';
13VARIABLE_NAME	VARIABLE_VALUE
14MYISAM_BLOCK_SIZE	1024
15select * from information_schema.session_variables where variable_name='myisam_block_size';
16VARIABLE_NAME	VARIABLE_VALUE
17MYISAM_BLOCK_SIZE	1024
18set global myisam_block_size=1;
19ERROR HY000: Variable 'myisam_block_size' is a read only variable
20set session myisam_block_size=1;
21ERROR HY000: Variable 'myisam_block_size' is a read only variable
22