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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;