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******************************* * basic concurent online alter test ******************************* * With Commit ******************************* CREATE TABLE t1 (a INT UNSIGNED, b INT UNSIGNED not null, primary key(a)) ENGINE NDB; begin; update t1 set b = b + 1 where a = 1; ALTER OFFLINE TABLE t1 ADD c CHAR(19); ERROR HY000: Lock wait timeout exceeded; try restarting transaction commit; ALTER OFFLINE TABLE t1 ADD c CHAR(19); create unique index b_unq on t1(b) using hash; ERROR 23000: Can't write, because of unique constraint, to table 't1' update t1 set b = b - 1 where a = 1; create unique index b_unq on t1(b) using hash; DROP TABLE t1;