MINI MINI MANI MO

set names utf8;
CREATE TABLE t(
a INT AUTO_INCREMENT PRIMARY KEY,
b CHAR(100),
c INT,
z INT,
INDEX idx(b))
ENGINE=InnoDB STATS_PERSISTENT=0;
INSERT INTO t VALUES(0,'x',1, 1);
CREATE UNIQUE INDEX idx1 ON t(c, b);
SELECT * FROM t;
a	b	c	z
1	x	1	1
INSERT INTO t SELECT 0,b,c+1,z+1 FROM t;
select count(*) from t;
count(*)
2
SET GLOBAL innodb_fast_shutdown=0;
# restart: --innodb-read-only
SET SESSION debug="+d,dict_set_index_corrupted";
check table t;
Table	Op	Msg_type	Msg_text
test.t	check	Warning	InnoDB: The B-tree of index idx is corrupted.
test.t	check	Warning	InnoDB: The B-tree of index idx1 is corrupted.
test.t	check	error	Corrupt
SET SESSION debug="-d,dict_set_index_corrupted";
select c from t;
ERROR HY000: Index t is corrupted
show warnings;
Level	Code	Message
Warning	180	InnoDB: Index idx1 for table `test`.`t` is marked as corrupted
Error	1712	Index t is corrupted
select * from t use index(primary) where a = 1;
a	b	c	z
1	x	1	1
# restart
DROP INDEX idx ON t;
DROP INDEX idx1 ON t;
drop table t;