config root man

SET @global_saved_tmp =  @@global.offline_mode;
CREATE USER 'user1'@'localhost';
connect conu1,localhost,user1;
use test;
DROP TABLE IF EXISTS t2;
CREATE TABLE t2 (c1 int,c2 char(10)) ENGINE=MyISAM;
INSERT INTO t2 VALUES (1,'aaaaaaaaaa');
INSERT INTO t2 VALUES (2,'bbbbbbbbbb');
connection default;
LOCK TABLE t2 read;
connection conu1;
# ALTER should copy table
alter table t2 add column j int;
connection default;
SET GLOBAL offline_mode = ON;
t2.MYD
t2.MYI
t2.frm
SELECT COUNT(USER) FROM INFORMATION_SCHEMA.PROCESSLIST;
COUNT(USER)
1
SET GLOBAL offline_mode = OFF;
UNLOCK TABLES;
disconnect conu1;
connect conu1,localhost,user1;
SELECT * FROM t2 ORDER BY c1;
c1	c2
1	aaaaaaaaaa
2	bbbbbbbbbb
DROP TABLE t2;
connection default;
SET GLOBAL offline_mode = ON;
SELECT COUNT(USER) FROM INFORMATION_SCHEMA.PROCESSLIST;
COUNT(USER)
1
disconnect conu1;
DROP USER 'user1'@'localhost';
# Restoring the original values.
SET @@global.offline_mode = @global_saved_tmp;