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--source include/have_innodb.inc SET @start_global_value = @@global.innodb_instant_alter_column_allowed; SET GLOBAL innodb_instant_alter_column_allowed=never; --error ER_INCORRECT_GLOBAL_LOCAL_VAR select @@session.innodb_instant_alter_column_allowed; show global variables like 'innodb_instant_alter_column_allowed'; show session variables like 'innodb_instant_alter_column_allowed'; SELECT * FROM information_schema.global_variables WHERE variable_name='innodb_instant_alter_column_allowed'; SELECT * FROM information_schema.session_variables WHERE variable_name='innodb_instant_alter_column_allowed'; --error ER_WRONG_VALUE_FOR_VAR set global innodb_instant_alter_column_allowed=no; --error ER_WRONG_TYPE_FOR_VAR set global innodb_instant_alter_column_allowed=1.1; --error ER_WRONG_VALUE_FOR_VAR set global innodb_instant_alter_column_allowed=-1; select @@global.innodb_instant_alter_column_allowed; --error ER_WRONG_VALUE_FOR_VAR set global innodb_instant_alter_column_allowed=3; select @@global.innodb_instant_alter_column_allowed; set global innodb_instant_alter_column_allowed=2; select @@global.innodb_instant_alter_column_allowed; set global innodb_instant_alter_column_allowed=1; select @@global.innodb_instant_alter_column_allowed; set global innodb_instant_alter_column_allowed=0; select @@global.innodb_instant_alter_column_allowed; set global innodb_instant_alter_column_allowed=default; select @@global.innodb_instant_alter_column_allowed; SET GLOBAL innodb_instant_alter_column_allowed = @start_global_value;