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--source include/have_innodb.inc SET @start_global_value = @@global.innodb_deadlock_detect; SELECT @start_global_value; # # exists as global # --echo Valid values are 'ON' and 'OFF' select @@global.innodb_deadlock_detect in (0, 1); select @@global.innodb_deadlock_detect; --error ER_INCORRECT_GLOBAL_LOCAL_VAR select @@session.innodb_deadlock_detect in (0, 1); --error ER_INCORRECT_GLOBAL_LOCAL_VAR select @@session.innodb_deadlock_detect; show global variables like 'innodb_deadlock_detect'; show session variables like 'innodb_deadlock_detect'; # # show that it's writable # set global innodb_deadlock_detect='OFF'; --error ER_GLOBAL_VARIABLE set session innodb_deadlock_detect='OFF'; select @@global.innodb_deadlock_detect; set @@global.innodb_deadlock_detect=1; select @@global.innodb_deadlock_detect; set global innodb_deadlock_detect=0; select @@global.innodb_deadlock_detect; set @@global.innodb_deadlock_detect='ON'; select @@global.innodb_deadlock_detect; # # incorrect types # --error ER_WRONG_TYPE_FOR_VAR set global innodb_deadlock_detect=1.1; --error ER_WRONG_TYPE_FOR_VAR set global innodb_deadlock_detect=1e1; --error ER_WRONG_VALUE_FOR_VAR set global innodb_deadlock_detect=2; --error ER_WRONG_VALUE_FOR_VAR set global innodb_deadlock_detect='AUTO'; --error ER_WRONG_VALUE_FOR_VAR set global innodb_deadlock_detect=-3; select @@global.innodb_deadlock_detect; # # Cleanup # SET @@global.innodb_deadlock_detect = @start_global_value; SELECT @@global.innodb_deadlock_detect;