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