SHOW VARIABLES LIKE 'server_id'; Variable_name Value server_id 1 SHOW INSTANCES; instance_name state mysqld1 XXXXX mysqld2 offline UNSET mysqld1.server_id; ERROR HY000: The instance is active. Stop the instance first SET mysqld1.server_id = 11; ERROR HY000: The instance is active. Stop the instance first CREATE INSTANCE mysqld3 datadir = '/', server_id = 3, socket = "$MYSQL_TMP_DIR/mysqld_3.sock"; START INSTANCE mysqld3; UNSET mysqld3.server_id; ERROR HY000: The instance is active. Stop the instance first SET mysqld3.server_id = 11; ERROR HY000: The instance is active. Stop the instance first STOP INSTANCE mysqld3; SHOW INSTANCE STATUS mysqld3; instance_name state version_number version mysqld_compatible mysqld3 offline VERSION_NUMBER VERSION no UNSET mysqld2.server_id; UNSET mysqld2.server_id; SHOW INSTANCE OPTIONS mysqld2; option_name value instance_name option_value socket option_value pid-file option_value port option_value datadir option_value log option_value log-error option_value log-slow-queries option_value language option_value character-sets-dir option_value basedir option_value shutdown-delay option_value skip-stack-trace option_value loose-skip-innodb option_value loose-skip-ndbcluster option_value nonguarded option_value log-output option_value SET mysqld2.server_id = 2; SET mysqld2.server_id = 2; SHOW INSTANCE OPTIONS mysqld2; option_name value instance_name option_value socket option_value pid-file option_value port option_value datadir option_value log option_value log-error option_value log-slow-queries option_value language option_value character-sets-dir option_value basedir option_value shutdown-delay option_value skip-stack-trace option_value loose-skip-innodb option_value loose-skip-ndbcluster option_value nonguarded option_value log-output option_value server_id option_value UNSET mysqld2.server_id = 11; ERROR 42000: You have an error in your command syntax. Check the manual that corresponds to your MySQL Instance Manager version for the right syntax to use SET mysqld2.aaa, mysqld3.bbb, mysqld2.ccc = 0010, mysqld3.ddd = 0020; -------------------------------------------------------------------- aaa -------------------------------------------------------------------- bbb -------------------------------------------------------------------- ccc=0010 -------------------------------------------------------------------- ddd=0020 -------------------------------------------------------------------- UNSET mysqld2.aaa, mysqld3.bbb, mysqld2.ccc, mysqld3.ddd; -------------------------------------------------------------------- -------------------------------------------------------------------- -------------------------------------------------------------------- -------------------------------------------------------------------- -------------------------------------------------------------------- SET mysqld2.aaa, mysqld3.bbb, mysqld.ccc = 0010; ERROR HY000: Unknown instance name -------------------------------------------------------------------- -------------------------------------------------------------------- -------------------------------------------------------------------- -------------------------------------------------------------------- SET mysqld2.aaa, mysqld3.bbb, mysqld1.ccc = 0010; ERROR HY000: The instance is active. Stop the instance first -------------------------------------------------------------------- -------------------------------------------------------------------- -------------------------------------------------------------------- -------------------------------------------------------------------- UNSET mysqld2.server_id, mysqld3.server_id, mysqld.ccc; ERROR HY000: Unknown instance name -------------------------------------------------------------------- server_id = 1 server_id=2 server_id=3 -------------------------------------------------------------------- UNSET mysqld2.server_id, mysqld3.server_id, mysqld1.ccc; ERROR HY000: The instance is active. Stop the instance first -------------------------------------------------------------------- server_id = 1 server_id=2 server_id=3 -------------------------------------------------------------------- DROP INSTANCE mysqld3; SET mysqld2.server_id=222; SET mysqld2.server_id = 222; SET mysqld2.server_id = 222 ; SET mysqld2 . server_id = 222 ; SET mysqld2 . server_id = 222 , mysqld2 . aaa , mysqld2 . bbb ; -------------------------------------------------------------------- server_id = 1 server_id=222 -------------------------------------------------------------------- aaa -------------------------------------------------------------------- bbb -------------------------------------------------------------------- UNSET mysqld2 . aaa , mysqld2 . bbb ; -------------------------------------------------------------------- server_id = 1 server_id=222 -------------------------------------------------------------------- -------------------------------------------------------------------- -------------------------------------------------------------------- -------------------------------------------------------------------- server_id = 1 server_id=222 -------------------------------------------------------------------- SHOW VARIABLES LIKE 'server_id'; Variable_name Value server_id 1 SHOW INSTANCES; instance_name state mysqld1 online mysqld2 offline FLUSH INSTANCES; ERROR HY000: At least one instance is active. Stop all instances first STOP INSTANCE mysqld1; SHOW INSTANCES; instance_name state mysqld1 offline mysqld2 offline FLUSH INSTANCES;