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SET @start_global_value = @@global.innodb_background_scrub_data_compressed;
#
# exists as global only
#
select @@global.innodb_background_scrub_data_compressed;
@@global.innodb_background_scrub_data_compressed
0
select @@session.innodb_background_scrub_data_compressed;
ERROR HY000: Variable 'innodb_background_scrub_data_compressed' is a GLOBAL variable
show global variables like 'innodb_background_scrub_data_compressed';
Variable_name Value
innodb_background_scrub_data_compressed OFF
show session variables like 'innodb_background_scrub_data_compressed';
Variable_name Value
innodb_background_scrub_data_compressed OFF
select * from information_schema.global_variables
where variable_name='innodb_background_scrub_data_compressed';
VARIABLE_NAME VARIABLE_VALUE
INNODB_BACKGROUND_SCRUB_DATA_COMPRESSED OFF
select * from information_schema.session_variables
where variable_name='innodb_background_scrub_data_compressed';
VARIABLE_NAME VARIABLE_VALUE
INNODB_BACKGROUND_SCRUB_DATA_COMPRESSED OFF
#
# show that it's writable
#
set global innodb_background_scrub_data_compressed=ON;
select @@global.innodb_background_scrub_data_compressed;
@@global.innodb_background_scrub_data_compressed
1
set global innodb_background_scrub_data_compressed=OFF;
select @@global.innodb_background_scrub_data_compressed;
@@global.innodb_background_scrub_data_compressed
0
set global innodb_background_scrub_data_compressed=1;
select @@global.innodb_background_scrub_data_compressed;
@@global.innodb_background_scrub_data_compressed
1
set session innodb_background_scrub_data_compressed=1;
ERROR HY000: Variable 'innodb_background_scrub_data_compressed' is a GLOBAL variable and should be set with SET GLOBAL
#
# incorrect types
#
set global innodb_background_scrub_data_compressed=1.1;
ERROR 42000: Incorrect argument type to variable 'innodb_background_scrub_data_compressed'
set global innodb_background_scrub_data_compressed=1e1;
ERROR 42000: Incorrect argument type to variable 'innodb_background_scrub_data_compressed'
set global innodb_background_scrub_data_compressed="foo";
ERROR 42000: Variable 'innodb_background_scrub_data_compressed' can't be set to the value of 'foo'
SET @@global.innodb_background_scrub_data_compressed = @start_global_value;
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