drop table if exists t1;
create table t1 SELECT 1,"table 1";
repair table t1 use_frm;
Table	Op	Msg_type	Msg_text
test.t1	repair	warning	Number of rows changed from 0 to 1
test.t1	repair	status	OK
alter table t1 ENGINE=HEAP;
repair table t1 use_frm;
Table	Op	Msg_type	Msg_text
test.t1	repair	note	The storage engine for the table doesn't support repair
drop table t1;
create table t1(id int PRIMARY KEY, st varchar(10), KEY st_key(st));
insert into t1 values(1, "One");
alter table t1 disable keys;
show keys from t1;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
t1	0	PRIMARY	1	id	A	1	NULL	NULL		BTREE	
t1	1	st_key	1	st	A	NULL	NULL	NULL	YES	BTREE	disabled
repair table t1 extended;
Table	Op	Msg_type	Msg_text
test.t1	repair	status	OK
show keys from t1;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
t1	0	PRIMARY	1	id	A	1	NULL	NULL		BTREE	
t1	1	st_key	1	st	A	NULL	NULL	NULL	YES	BTREE	disabled
drop table t1;
repair table t1 use_frm;
Table	Op	Msg_type	Msg_text
test.t1	repair	error	Table 'test.t1' doesn't exist
Warnings:
Error	1146	Table 'test.t1' doesn't exist
create table t1 engine=myisam SELECT 1,"table 1";
flush tables;
repair table t1;
Table	Op	Msg_type	Msg_text
test.t1	repair	error	Incorrect file format 't1'
Warnings:
Error	130	Incorrect file format 't1'
repair table t1 use_frm;
Table	Op	Msg_type	Msg_text
test.t1	repair	warning	Number of rows changed from 0 to 1
test.t1	repair	status	OK
drop table t1;
CREATE TABLE t1(a INT, KEY(a));
INSERT INTO t1 VALUES(1),(2),(3),(4),(5);
SET myisam_repair_threads=2;
REPAIR TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	repair	status	OK
SHOW INDEX FROM t1;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
t1	1	a	1	a	A	5	NULL	NULL	YES	BTREE	
SET myisam_repair_threads=@@global.myisam_repair_threads;
DROP TABLE t1;
CREATE TABLE t1(a INT);
USE mysql;
REPAIR TABLE test.t1 USE_FRM;
Table	Op	Msg_type	Msg_text
test.t1	repair	status	OK
USE test;
DROP TABLE t1;
CREATE TABLE t1(a CHAR(255), KEY(a));
SET myisam_sort_buffer_size=4096;
INSERT INTO t1 VALUES
('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),
('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),
('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),
('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),
('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),
('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),
('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),
('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),
('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),
('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),
('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),
('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),
('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),
('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),
('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),('0'),
('0'),('0'),('0'),('0'),('0'),('0'),('0');
SET myisam_repair_threads=2;
REPAIR TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	repair	error	sort_buffer_size is to small
test.t1	repair	warning	Number of rows changed from 0 to 157
test.t1	repair	status	OK
SET myisam_repair_threads=@@global.myisam_repair_threads;
SET myisam_sort_buffer_size=@@global.myisam_sort_buffer_size;
DROP TABLE t1;