select @@global.aria_pagecache_file_hash_size;
@@global.aria_pagecache_file_hash_size
512
select @@session.aria_pagecache_file_hash_size;
ERROR HY000: Variable 'aria_pagecache_file_hash_size' is a GLOBAL variable
show global variables like 'aria_pagecache_file_hash_size';
Variable_name	Value
aria_pagecache_file_hash_size	512
show session variables like 'aria_pagecache_file_hash_size';
Variable_name	Value
aria_pagecache_file_hash_size	512
select * from information_schema.global_variables where variable_name='aria_pagecache_file_hash_size';
VARIABLE_NAME	VARIABLE_VALUE
ARIA_PAGECACHE_FILE_HASH_SIZE	512
select * from information_schema.session_variables where variable_name='aria_pagecache_file_hash_size';
VARIABLE_NAME	VARIABLE_VALUE
ARIA_PAGECACHE_FILE_HASH_SIZE	512
set global aria_pagecache_file_hash_size=200;
ERROR HY000: Variable 'aria_pagecache_file_hash_size' is a read only variable
set session aria_pagecache_file_hash_size=200;
ERROR HY000: Variable 'aria_pagecache_file_hash_size' is a read only variable
