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# # only global # select @@global.thread_concurrency; --error ER_INCORRECT_GLOBAL_LOCAL_VAR select @@session.thread_concurrency; show global variables like 'thread_concurrency'; show session variables like 'thread_concurrency'; select * from information_schema.global_variables where variable_name='thread_concurrency'; select * from information_schema.session_variables where variable_name='thread_concurrency'; # # show that it's read-only # --error ER_INCORRECT_GLOBAL_LOCAL_VAR set global thread_concurrency=1; --error ER_INCORRECT_GLOBAL_LOCAL_VAR set session thread_concurrency=1;