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select @@global.myisam_mmap_size;
@@global.myisam_mmap_size
18446744073709551615
select @@session.myisam_mmap_size;
ERROR HY000: Variable 'myisam_mmap_size' is a GLOBAL variable
show global variables like 'myisam_mmap_size';
Variable_name Value
myisam_mmap_size 18446744073709551615
show session variables like 'myisam_mmap_size';
Variable_name Value
myisam_mmap_size 18446744073709551615
select * from information_schema.global_variables where variable_name='myisam_mmap_size';
VARIABLE_NAME VARIABLE_VALUE
MYISAM_MMAP_SIZE 18446744073709551615
select * from information_schema.session_variables where variable_name='myisam_mmap_size';
VARIABLE_NAME VARIABLE_VALUE
MYISAM_MMAP_SIZE 18446744073709551615
set global myisam_mmap_size=1;
ERROR HY000: Variable 'myisam_mmap_size' is a read only variable
set session myisam_mmap_size=1;
ERROR HY000: Variable 'myisam_mmap_size' is a read only variable
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