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select @@global.max_digest_length;
@@global.max_digest_length
1024
select @@session.max_digest_length;
ERROR HY000: Variable 'max_digest_length' is a GLOBAL variable
show global variables like 'max_digest_length';
Variable_name Value
max_digest_length 1024
show session variables like 'max_digest_length';
Variable_name Value
max_digest_length 1024
select * from information_schema.global_variables
where variable_name='max_digest_length';
VARIABLE_NAME VARIABLE_VALUE
MAX_DIGEST_LENGTH 1024
select * from information_schema.session_variables
where variable_name='max_digest_length';
VARIABLE_NAME VARIABLE_VALUE
MAX_DIGEST_LENGTH 1024
set global max_digest_length=1;
ERROR HY000: Variable 'max_digest_length' is a read only variable
set session max_digest_length=1;
ERROR HY000: Variable 'max_digest_length' is a read only variable
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