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SET @start_global_value = @@global.innodb_background_scrub_data_interval;
#
# exists as global only
#
select @@global.innodb_background_scrub_data_interval;
@@global.innodb_background_scrub_data_interval
604800
select @@session.innodb_background_scrub_data_interval;
ERROR HY000: Variable 'innodb_background_scrub_data_interval' is a GLOBAL variable
show global variables like 'innodb_background_scrub_data_interval';
Variable_name Value
innodb_background_scrub_data_interval 604800
show session variables like 'innodb_background_scrub_data_interval';
Variable_name Value
innodb_background_scrub_data_interval 604800
select * from information_schema.global_variables
where variable_name='innodb_background_scrub_data_interval';
VARIABLE_NAME VARIABLE_VALUE
INNODB_BACKGROUND_SCRUB_DATA_INTERVAL 604800
select * from information_schema.session_variables
where variable_name='innodb_background_scrub_data_interval';
VARIABLE_NAME VARIABLE_VALUE
INNODB_BACKGROUND_SCRUB_DATA_INTERVAL 604800
#
# show that it's writable
#
set global innodb_background_scrub_data_interval=100;
select @@global.innodb_background_scrub_data_interval;
@@global.innodb_background_scrub_data_interval
100
set global innodb_background_scrub_data_interval=200;
select @@global.innodb_background_scrub_data_interval;
@@global.innodb_background_scrub_data_interval
200
set global innodb_background_scrub_data_interval=300;
select @@global.innodb_background_scrub_data_interval;
@@global.innodb_background_scrub_data_interval
300
set session innodb_background_scrub_data_interval=400;
ERROR HY000: Variable 'innodb_background_scrub_data_interval' is a GLOBAL variable and should be set with SET GLOBAL
#
# incorrect types
#
set global innodb_background_scrub_data_interval=1.1;
ERROR 42000: Incorrect argument type to variable 'innodb_background_scrub_data_interval'
set global innodb_background_scrub_data_interval=1e1;
ERROR 42000: Incorrect argument type to variable 'innodb_background_scrub_data_interval'
set global innodb_background_scrub_data_interval="foo";
ERROR 42000: Incorrect argument type to variable 'innodb_background_scrub_data_interval'
SET @@global.innodb_background_scrub_data_interval = @start_global_value;
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