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select @@global.innodb_read_io_threads;
@@global.innodb_read_io_threads
2
select @@session.innodb_read_io_threads;
ERROR HY000: Variable 'innodb_read_io_threads' is a GLOBAL variable
show global variables like 'innodb_read_io_threads';
Variable_name Value
innodb_read_io_threads 2
show session variables like 'innodb_read_io_threads';
Variable_name Value
innodb_read_io_threads 2
select * from information_schema.global_variables where variable_name='innodb_read_io_threads';
VARIABLE_NAME VARIABLE_VALUE
INNODB_READ_IO_THREADS 2
select * from information_schema.session_variables where variable_name='innodb_read_io_threads';
VARIABLE_NAME VARIABLE_VALUE
INNODB_READ_IO_THREADS 2
set global innodb_read_io_threads=1;
ERROR HY000: Variable 'innodb_read_io_threads' is a read only variable
set session innodb_read_io_threads=1;
ERROR HY000: Variable 'innodb_read_io_threads' is a read only variable
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