#
# only global
#
--replace_result 4294967295 18446744073709551615
select @@global.myisam_mmap_size;
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
select @@session.myisam_mmap_size;
--replace_result 4294967295 18446744073709551615
show global variables like 'myisam_mmap_size';
--replace_result 4294967295 18446744073709551615
show session variables like 'myisam_mmap_size';
--replace_result 4294967295 18446744073709551615
select * from information_schema.global_variables where variable_name='myisam_mmap_size';
--replace_result 4294967295 18446744073709551615
select * from information_schema.session_variables where variable_name='myisam_mmap_size';

#
# show that it's read-only
#
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
set global myisam_mmap_size=1;
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
set session myisam_mmap_size=1;