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SELECT COUNT(@@GLOBAL.innodb_purge_threads); COUNT(@@GLOBAL.innodb_purge_threads) 1 1 Expected SELECT COUNT(@@innodb_purge_threads); COUNT(@@innodb_purge_threads) 1 1 Expected SET @@GLOBAL.innodb_purge_threads=1; ERROR HY000: Variable 'innodb_purge_threads' is a read only variable Expected error 'Read-only variable' SELECT innodb_purge_threads = @@SESSION.innodb_purge_threads; ERROR 42S22: Unknown column 'innodb_purge_threads' in 'field list' Expected error 'Read-only variable' SELECT @@GLOBAL.innodb_purge_threads = VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME='innodb_purge_threads'; @@GLOBAL.innodb_purge_threads = VARIABLE_VALUE 1 1 Expected SELECT COUNT(VARIABLE_VALUE) FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME='innodb_purge_threads'; COUNT(VARIABLE_VALUE) 1 1 Expected SELECT @@innodb_purge_threads = @@GLOBAL.innodb_purge_threads; @@innodb_purge_threads = @@GLOBAL.innodb_purge_threads 1 1 Expected SELECT COUNT(@@local.innodb_purge_threads); ERROR HY000: Variable 'innodb_purge_threads' is a GLOBAL variable Expected error 'Variable is a GLOBAL variable' SELECT COUNT(@@SESSION.innodb_purge_threads); ERROR HY000: Variable 'innodb_purge_threads' is a GLOBAL variable Expected error 'Variable is a GLOBAL variable' SELECT VARIABLE_NAME, VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME = 'innodb_purge_threads'; VARIABLE_NAME VARIABLE_VALUE INNODB_PURGE_THREADS 4