select @@global.large_page_size = 1; @@global.large_page_size = 1 0 select @@session.large_page_size; ERROR HY000: Variable 'large_page_size' is a GLOBAL variable show global variables like 'large_page_size'; Variable_name Value large_page_size # show session variables like 'large_page_size'; Variable_name Value large_page_size # select * from information_schema.global_variables where variable_name='large_page_size'; VARIABLE_NAME VARIABLE_VALUE LARGE_PAGE_SIZE # select * from information_schema.session_variables where variable_name='large_page_size'; VARIABLE_NAME VARIABLE_VALUE LARGE_PAGE_SIZE # set global large_page_size=1; ERROR HY000: Variable 'large_page_size' is a read only variable set session large_page_size=1; ERROR HY000: Variable 'large_page_size' is a read only variable