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SET @start_value = @@GLOBAL.innodb_priority_io;
SELECT @@GLOBAL.innodb_priority_io;
@@GLOBAL.innodb_priority_io
0
SELECT @@SESSION.innodb_priority_io;
ERROR HY000: Variable 'innodb_priority_io' is a GLOBAL variable
SET GLOBAL innodb_priority_io='OFF';
SELECT @@GLOBAL.innodb_priority_io;
@@GLOBAL.innodb_priority_io
0
SET GLOBAL innodb_priority_io='ON';
SELECT @@GLOBAL.innodb_priority_io;
@@GLOBAL.innodb_priority_io
1
SET GLOBAL innodb_priority_io=0;
SELECT @@GLOBAL.innodb_priority_io;
@@GLOBAL.innodb_priority_io
0
SET GLOBAL innodb_priority_io=1;
SELECT @@GLOBAL.innodb_priority_io;
@@GLOBAL.innodb_priority_io
1
SET GLOBAL innodb_priority_io=1.1;
ERROR 42000: Incorrect argument type to variable 'innodb_priority_io'
SET GLOBAL innodb_priority_io=1e1;
ERROR 42000: Incorrect argument type to variable 'innodb_priority_io'
SET GLOBAL innodb_priority_io=2;
ERROR 42000: Variable 'innodb_priority_io' can't be set to the value of '2'
SET GLOBAL innodb_priority_io='foo';
ERROR 42000: Variable 'innodb_priority_io' can't be set to the value of 'foo'
SET GLOBAL innodb_priority_io = @start_value;
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