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SET @global=@@global.thread_pool_max_threads; # # MDEV-21961 Bind CONNECTION ADMIN to a number of global system variables # # Test that "SET thread_pool_max_threads" is not allowed without CONNECTION ADMIN or SUPER CREATE USER user1@localhost; GRANT ALL PRIVILEGES ON *.* TO user1@localhost; REVOKE CONNECTION ADMIN, SUPER ON *.* FROM user1@localhost; connect user1,localhost,user1,,; connection user1; SET GLOBAL thread_pool_max_threads=10; ERROR 42000: Access denied; you need (at least one of) the SUPER, CONNECTION ADMIN privilege(s) for this operation SET thread_pool_max_threads=10; ERROR HY000: Variable 'thread_pool_max_threads' is a GLOBAL variable and should be set with SET GLOBAL SET SESSION thread_pool_max_threads=10; ERROR HY000: Variable 'thread_pool_max_threads' is a GLOBAL variable and should be set with SET GLOBAL disconnect user1; connection default; DROP USER user1@localhost; # Test that "SET thread_pool_max_threads" is allowed with CONNECTION ADMIN CREATE USER user1@localhost; GRANT CONNECTION ADMIN ON *.* TO user1@localhost; connect user1,localhost,user1,,; connection user1; SET GLOBAL thread_pool_max_threads=10; SET thread_pool_max_threads=10; ERROR HY000: Variable 'thread_pool_max_threads' is a GLOBAL variable and should be set with SET GLOBAL SET SESSION thread_pool_max_threads=10; ERROR HY000: Variable 'thread_pool_max_threads' is a GLOBAL variable and should be set with SET GLOBAL disconnect user1; connection default; DROP USER user1@localhost; # Test that "SET thread_pool_max_threads" is allowed with SUPER CREATE USER user1@localhost; GRANT SUPER ON *.* TO user1@localhost; connect user1,localhost,user1,,; connection user1; SET GLOBAL thread_pool_max_threads=10; SET thread_pool_max_threads=10; ERROR HY000: Variable 'thread_pool_max_threads' is a GLOBAL variable and should be set with SET GLOBAL SET SESSION thread_pool_max_threads=10; ERROR HY000: Variable 'thread_pool_max_threads' is a GLOBAL variable and should be set with SET GLOBAL disconnect user1; connection default; DROP USER user1@localhost; SET @@global.thread_pool_max_threads=@global;