drop table if exists t1,t2;
set @save_use_stat_tables=@@use_stat_tables;
DELETE FROM mysql.table_stat;
DELETE FROM mysql.column_stat;
DELETE FROM mysql.index_stat;
set use_stat_tables='preferably';
CREATE TABLE t1 (
a int NOT NULL PRIMARY KEY,
b varchar(32),
c char(16),
d date,
e double,
f bit(3),
INDEX idx1 (b, e), 
INDEX idx2 (c, d),
INDEX idx3 (d),
INDEX idx4 (e, b, d)
) ENGINE= MYISAM;
INSERT INTO t1 VALUES
(0, NULL, NULL, NULL, NULL, NULL),
(7, 'xxxxxxxxxxxxxxxxxxxxxxxxxx', 'dddddddd', '1990-05-15', 0.1, b'100'),
(17, 'vvvvvvvvvvvvv', 'aaaa', '1989-03-12', 0.01, b'101'),
(1, 'vvvvvvvvvvvvv', NULL, '1989-03-12', 0.01, b'100'),
(12, 'wwwwwwwwwwwwwwwwwwwwwwwwwwww', 'dddddddd', '1999-07-23', 0.112, b'001'),
(23, 'vvvvvvvvvvvvv', 'dddddddd', '1999-07-23', 0.1, b'100'),
(8, 'vvvvvvvvvvvvv', 'aaaa', '1999-07-23', 0.1, b'100'),
(22, 'xxxxxxxxxxxxxxxxxxxxxxxxxx', 'aaaa', '1989-03-12', 0.112, b'001'),
(31, 'wwwwwwwwwwwwwwwwwwwwwwwwwwww', 'aaaa', '1999-07-23', 0.01, b'001'),
(10, NULL, 'aaaa', NULL, 0.01, b'010'),
(5, 'wwwwwwwwwwwwwwwwwwwwwwwwwwww', 'dddddddd', '1999-07-23', 0.1, b'100'),
(15, 'vvvvvvvvvvvvv', 'ccccccccc', '1990-05-15', 0.1, b'010'),
(30, NULL, 'bbbbbb', NULL, NULL, b'100'),
(38, 'zzzzzzzzzzzzzzzzzz', 'bbbbbb', NULL, NULL, NULL),
(18, 'zzzzzzzzzzzzzzzzzz', 'ccccccccc', '1990-05-15', 0.01, b'010'),
(9, 'yyy', 'bbbbbb', '1998-08-28', 0.01, NULL),
(29, 'vvvvvvvvvvvvv', 'dddddddd', '1999-07-23', 0.012, b'010'),
(3, 'yyy', 'dddddddd',  '1990-05-15', 0.112, b'010'),
(39, 'zzzzzzzzzzzzzzzzzz', 'bbbbbb', NULL, 0.01, b'100'),
(14, 'xxxxxxxxxxxxxxxxxxxxxxxxxx', 'ccccccccc', '1990-05-15', 0.1, b'100'),
(40, 'zzzzzzzzzzzzzzzzzz', 'bbbbbb', '1989-03-12', NULL, NULL),
(44, NULL, 'aaaa', '1989-03-12', NULL, b'010'),
(19, 'vvvvvvvvvvvvv', 'ccccccccc', '1990-05-15', 0.012, b'011'),
(21, 'zzzzzzzzzzzzzzzzzz', 'dddddddd', '1989-03-12', 0.112, b'100'),
(45, NULL, NULL, '1989-03-12', NULL, b'011'),
(2, 'wwwwwwwwwwwwwwwwwwwwwwwwwwww', 'ccccccccc', '1990-05-15', 0.1, b'001'),
(35, 'yyy', 'aaaa', '1990-05-15', 0.05, b'011'),
(4, 'vvvvvvvvvvvvv', 'dddddddd', '1999-07-23', 0.01, b'101'),
(47, NULL, 'aaaa', '1990-05-15', 0.05, b'010'),
(42, NULL, 'ccccccccc', '1989-03-12', 0.01, b'010'),
(32, NULL, 'bbbbbb', '1990-05-15', 0.01, b'011'),
(49, 'wwwwwwwwwwwwwwwwwwwwwwwwwwww' , 'aaaa', '1990-05-15', NULL, NULL),
(43, 'wwwwwwwwwwwwwwwwwwwwwwwwwwww' , 'bbbbbb', '1990-05-15', NULL, b'100'),
(37, 'yyy', NULL, '1989-03-12', 0.05, b'011'),
(41, 'xxxxxxxxxxxxxxxxxxxxxxxxxx', 'ccccccccc', '1990-05-15', 0.05, NULL),
(34, 'yyy', NULL, NULL, NULL, NULL),
(33, 'zzzzzzzzzzzzzzzzzz', 'dddddddd', '1989-03-12', 0.05, b'011'),
(24,  'wwwwwwwwwwwwwwwwwwwwwwwwwwww', 'dddddddd', '1990-05-15', 0.01,  b'101'),
(11, 'yyy', 'ccccccccc', '1999-07-23', 0.1, NULL),
(25, 'zzzzzzzzzzzzzzzzzz', 'bbb', '1989-03-12', 0.01,  b'101');
ANALYZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
SELECT * FROM mysql.table_stat;
db_name	table_name	cardinality
test	t1	40
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx1	1	6.4000
test	t1	idx1	2	1.6875
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t1	idx3	1	8.5000
test	t1	idx4	1	6.2000
test	t1	idx4	2	1.6875
test	t1	idx4	3	1.1304
SELECT COUNT(*) FROM t1;
COUNT(*)
40
SELECT * FROM mysql.column_stat
WHERE db_name='test' AND table_name='t1' AND column_name='a';
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
SELECT MIN(t1.a), MAX(t1.a), 
(SELECT COUNT(*) FROM t1 WHERE t1.b IS NULL) /
(SELECT COUNT(*) FROM t1) AS "NULLS_RATIO(t1.a)",
(SELECT COUNT(t1.a) FROM t1) /
(SELECT COUNT(DISTINCT t1.a) FROM t1) AS "AVG_FREQUENCY(t1.a)"
FROM t1;
MIN(t1.a)	MAX(t1.a)	NULLS_RATIO(t1.a)	AVG_FREQUENCY(t1.a)
0	49	0.2000	1.0000
SELECT * FROM mysql.column_stat
WHERE db_name='test' AND table_name='t1' AND column_name='b';
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
SELECT MIN(t1.b), MAX(t1.b), 
(SELECT COUNT(*) FROM t1 WHERE t1.b IS NULL) /
(SELECT COUNT(*) FROM t1) AS "NULLS_RATIO(t1.b)",
(SELECT COUNT(t1.b) FROM t1) /
(SELECT COUNT(DISTINCT t1.b) FROM t1) AS "AVG_FREQUENCY(t1.b)"
FROM t1;
MIN(t1.b)	MAX(t1.b)	NULLS_RATIO(t1.b)	AVG_FREQUENCY(t1.b)
vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	6.4000
SELECT * FROM mysql.column_stat 
WHERE db_name='test' AND table_name='t1' AND column_name='c';
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
SELECT MIN(t1.c), MAX(t1.c), 
(SELECT COUNT(*) FROM t1 WHERE t1.c IS NULL) /
(SELECT COUNT(*) FROM t1) AS "NULLS_RATIO(t1.c)",
(SELECT COUNT(t1.c) FROM t1) /
(SELECT COUNT(DISTINCT t1.c) FROM t1) AS "AVG_FREQUENCY(t1.c)"
FROM t1;
MIN(t1.c)	MAX(t1.c)	NULLS_RATIO(t1.c)	AVG_FREQUENCY(t1.c)
aaaa	dddddddd	0.1250	7.0000
SELECT * FROM mysql.column_stat
WHERE db_name='test' AND table_name='t1' AND column_name='d';
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
SELECT MIN(t1.d), MAX(t1.d), 
(SELECT COUNT(*) FROM t1 WHERE t1.d IS NULL) /
(SELECT COUNT(*) FROM t1) AS "NULLS_RATIO(t1.d)",
(SELECT COUNT(t1.d) FROM t1) /
(SELECT COUNT(DISTINCT t1.d) FROM t1) AS "AVG_FREQUENCY(t1.d)"
FROM t1;
MIN(t1.d)	MAX(t1.d)	NULLS_RATIO(t1.d)	AVG_FREQUENCY(t1.d)
1989-03-12	1999-07-23	0.1500	8.5000
SELECT * FROM mysql.column_stat
WHERE db_name='test' AND table_name='t1' AND column_name='e';
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
SELECT MIN(t1.e), MAX(t1.e), 
(SELECT COUNT(*) FROM t1 WHERE t1.e IS NULL) /
(SELECT COUNT(*) FROM t1) AS "NULLS_RATIO(t1.e)",
(SELECT COUNT(t1.e) FROM t1) /
(SELECT COUNT(DISTINCT t1.e) FROM t1) AS "AVG_FREQUENCY(t1.e)"
FROM t1;
MIN(t1.e)	MAX(t1.e)	NULLS_RATIO(t1.e)	AVG_FREQUENCY(t1.e)
0.01	0.112	0.2250	6.2000
SELECT * FROM mysql.index_stat
WHERE db_name='test' AND table_name='t1' AND index_name='idx1';
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	idx1	1	6.4000
test	t1	idx1	2	1.6875
SELECT 
(SELECT COUNT(*) FROM t1 WHERE t1.b IS NOT NULL) /
(SELECT COUNT(DISTINCT t1.b) FROM t1 WHERE t1.b IS NOT NULL)
AS 'ARITY 1',
(SELECT COUNT(*) FROM t1 WHERE t1.b IS NOT NULL AND t1.e IS NOT NULL) /
(SELECT COUNT(DISTINCT t1.b, t1.e) FROM t1
WHERE t1.b IS NOT NULL AND t1.e IS NOT NULL) 
AS 'ARITY 2';
ARITY 1	ARITY 2
6.4000	1.6875
SELECT * FROM mysql.index_stat
WHERE db_name='test' AND table_name='t1' AND index_name='idx2';
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
SELECT 
(SELECT COUNT(*) FROM t1 WHERE t1.c IS NOT NULL) /
(SELECT COUNT(DISTINCT t1.c) FROM t1 WHERE t1.c IS NOT NULL) 
AS 'ARITY 1',
(SELECT COUNT(*) FROM t1 WHERE t1.c IS NOT NULL AND t1.d IS NOT NULL) /
(SELECT COUNT(DISTINCT t1.c, t1.d) FROM t1
WHERE t1.c IS NOT NULL AND t1.d IS NOT NULL)
AS 'ARITY 2';
ARITY 1	ARITY 2
7.0000	2.3846
SELECT * FROM mysql.index_stat
WHERE db_name='test' AND table_name='t1' AND index_name='idx3';
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	idx3	1	8.5000
SELECT 
(SELECT COUNT(*) FROM t1 WHERE t1.d IS NOT NULL) /
(SELECT COUNT(DISTINCT t1.d) FROM t1 WHERE t1.d IS NOT NULL)
AS 'ARITY 1';
ARITY 1
8.5000
SELECT * FROM mysql.index_stat
WHERE db_name='test' AND table_name='t1' AND index_name='idx4';
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	idx4	1	6.2000
test	t1	idx4	2	1.6875
test	t1	idx4	3	1.1304
SELECT 
(SELECT COUNT(*) FROM t1 WHERE t1.e IS NOT NULL) /
(SELECT COUNT(DISTINCT t1.e) FROM t1 WHERE t1.e IS NOT NULL)
AS 'ARITY 1',
(SELECT COUNT(*) FROM t1 WHERE t1.e IS NOT NULL AND t1.b IS NOT NULL) /
(SELECT COUNT(DISTINCT t1.e, t1.b) FROM t1
WHERE t1.e IS NOT NULL AND t1.b IS NOT NULL)
AS 'ARITY 2',
(SELECT COUNT(*) FROM t1
WHERE t1.e IS NOT NULL AND t1.b IS NOT NULL AND t1.d IS NOT NULL) /  
(SELECT COUNT(DISTINCT t1.e, t1.b, t1.d) FROM t1
WHERE t1.e IS NOT NULL AND t1.b IS NOT NULL AND t1.d IS NOT NULL)
AS 'ARITY 3';
ARITY 1	ARITY 2	ARITY 3
6.2000	1.6875	1.1304
CREATE TABLE t3 (
a int NOT NULL PRIMARY KEY,
b varchar(32),
c char(16),
INDEX idx (c)
) ENGINE=MYISAM;
INSERT INTO t3 VALUES
(0, NULL, NULL),
(7, 'xxxxxxxxxxxxxxxxxxxxxxxxxx', 'dddddddd'),
(17, 'vvvvvvvvvvvvv', 'aaaa'),
(1, 'vvvvvvvvvvvvv', NULL),
(12, 'wwwwwwwwwwwwwwwwwwwwwwwwwwww', 'dddddddd'),
(23, 'vvvvvvvvvvvvv', 'dddddddd'),
(8, 'vvvvvvvvvvvvv', 'aaaa'),
(22, 'xxxxxxxxxxxxxxxxxxxxxxxxxx', 'aaaa'),
(31, 'wwwwwwwwwwwwwwwwwwwwwwwwwwww', 'aaaa'),
(10, NULL, 'aaaa'),
(5, 'wwwwwwwwwwwwwwwwwwwwwwwwwwww', 'dddddddd'),
(15, 'vvvvvvvvvvvvv', 'ccccccccc'),
(30, NULL, 'bbbbbb'),
(38, 'zzzzzzzzzzzzzzzzzz', 'bbbbbb'),
(18, 'zzzzzzzzzzzzzzzzzz', 'ccccccccc'),
(9, 'yyy', 'bbbbbb'),
(29, 'vvvvvvvvvvvvv', 'dddddddd');
ANALYZE TABLE t3;
Table	Op	Msg_type	Msg_text
test.t3	analyze	status	OK
SELECT * FROM mysql.table_stat;
db_name	table_name	cardinality
test	t1	40
test	t3	17
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
test	t3	a	0	38	0.0000	4.0000	1.0000
test	t3	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.1765	18.0714	2.8000
test	t3	c	aaaa	dddddddd	0.1176	6.4000	3.7500
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx1	1	6.4000
test	t1	idx1	2	1.6875
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t1	idx3	1	8.5000
test	t1	idx4	1	6.2000
test	t1	idx4	2	1.6875
test	t1	idx4	3	1.1304
test	t3	PRIMARY	1	1.0000
test	t3	idx	1	3.7500
ALTER TABLE t1 RENAME TO s1;
SELECT * FROM mysql.table_stat;
db_name	table_name	cardinality
test	s1	40
test	t3	17
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	s1	a	0	49	0.0000	4.0000	1.0000
test	s1	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
test	s1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	s1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	s1	e	0.01	0.112	0.2250	8.0000	6.2000
test	s1	f	1	5	0.2000	1.0000	6.4000
test	t3	a	0	38	0.0000	4.0000	1.0000
test	t3	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.1765	18.0714	2.8000
test	t3	c	aaaa	dddddddd	0.1176	6.4000	3.7500
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	s1	PRIMARY	1	1.0000
test	s1	idx1	1	6.4000
test	s1	idx1	2	1.6875
test	s1	idx2	1	7.0000
test	s1	idx2	2	2.3846
test	s1	idx3	1	8.5000
test	s1	idx4	1	6.2000
test	s1	idx4	2	1.6875
test	s1	idx4	3	1.1304
test	t3	PRIMARY	1	1.0000
test	t3	idx	1	3.7500
RENAME TABLE s1 TO t1;
SELECT * FROM mysql.table_stat;
db_name	table_name	cardinality
test	t1	40
test	t3	17
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
test	t3	a	0	38	0.0000	4.0000	1.0000
test	t3	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.1765	18.0714	2.8000
test	t3	c	aaaa	dddddddd	0.1176	6.4000	3.7500
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx1	1	6.4000
test	t1	idx1	2	1.6875
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t1	idx3	1	8.5000
test	t1	idx4	1	6.2000
test	t1	idx4	2	1.6875
test	t1	idx4	3	1.1304
test	t3	PRIMARY	1	1.0000
test	t3	idx	1	3.7500
DROP TABLE t3;
SELECT * FROM mysql.table_stat;
db_name	table_name	cardinality
test	t1	40
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx1	1	6.4000
test	t1	idx1	2	1.6875
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t1	idx3	1	8.5000
test	t1	idx4	1	6.2000
test	t1	idx4	2	1.6875
test	t1	idx4	3	1.1304
CREATE TEMPORARY TABLE t0 (
a int NOT NULL PRIMARY KEY,
b varchar(32)
);
INSERT INTO t0 SELECT a,b FROM t1;
ALTER TABLE t1 CHANGE COLUMN b x varchar(32), 
CHANGE COLUMN e y double;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `x` varchar(32) DEFAULT NULL,
  `c` char(16) DEFAULT NULL,
  `d` date DEFAULT NULL,
  `y` double DEFAULT NULL,
  `f` bit(3) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `idx1` (`x`,`y`),
  KEY `idx2` (`c`,`d`),
  KEY `idx3` (`d`),
  KEY `idx4` (`y`,`x`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	x	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	y	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
ALTER TABLE t1 CHANGE COLUMN x b varchar(32), 
CHANGE COLUMN y e double;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `b` varchar(32) DEFAULT NULL,
  `c` char(16) DEFAULT NULL,
  `d` date DEFAULT NULL,
  `e` double DEFAULT NULL,
  `f` bit(3) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `idx1` (`b`,`e`),
  KEY `idx2` (`c`,`d`),
  KEY `idx3` (`d`),
  KEY `idx4` (`e`,`b`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
ALTER TABLE t1 RENAME TO s1, CHANGE COLUMN b x varchar(32);
SHOW CREATE TABLE s1;
Table	Create Table
s1	CREATE TABLE `s1` (
  `a` int(11) NOT NULL,
  `x` varchar(32) DEFAULT NULL,
  `c` char(16) DEFAULT NULL,
  `d` date DEFAULT NULL,
  `e` double DEFAULT NULL,
  `f` bit(3) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `idx1` (`x`,`e`),
  KEY `idx2` (`c`,`d`),
  KEY `idx3` (`d`),
  KEY `idx4` (`e`,`x`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.table_stat;
db_name	table_name	cardinality
test	s1	40
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	s1	a	0	49	0.0000	4.0000	1.0000
test	s1	x	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
test	s1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	s1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	s1	e	0.01	0.112	0.2250	8.0000	6.2000
test	s1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	s1	PRIMARY	1	1.0000
test	s1	idx1	1	6.4000
test	s1	idx1	2	1.6875
test	s1	idx2	1	7.0000
test	s1	idx2	2	2.3846
test	s1	idx3	1	8.5000
test	s1	idx4	1	6.2000
test	s1	idx4	2	1.6875
test	s1	idx4	3	1.1304
ALTER TABLE s1 RENAME TO t1, CHANGE COLUMN x b varchar(32);
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `b` varchar(32) DEFAULT NULL,
  `c` char(16) DEFAULT NULL,
  `d` date DEFAULT NULL,
  `e` double DEFAULT NULL,
  `f` bit(3) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `idx1` (`b`,`e`),
  KEY `idx2` (`c`,`d`),
  KEY `idx3` (`d`),
  KEY `idx4` (`e`,`b`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.table_stat;
db_name	table_name	cardinality
test	t1	40
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx1	1	6.4000
test	t1	idx1	2	1.6875
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t1	idx3	1	8.5000
test	t1	idx4	1	6.2000
test	t1	idx4	2	1.6875
test	t1	idx4	3	1.1304
ALTER TABLE t1 CHANGE COLUMN b x varchar(30);
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `x` varchar(30) DEFAULT NULL,
  `c` char(16) DEFAULT NULL,
  `d` date DEFAULT NULL,
  `e` double DEFAULT NULL,
  `f` bit(3) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `idx1` (`x`,`e`),
  KEY `idx2` (`c`,`d`),
  KEY `idx3` (`d`),
  KEY `idx4` (`e`,`x`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx1	1	6.4000
test	t1	idx1	2	1.6875
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t1	idx3	1	8.5000
test	t1	idx4	1	6.2000
test	t1	idx4	2	1.6875
test	t1	idx4	3	1.1304
ALTER TABLE t1 CHANGE COLUMN x b varchar(32);
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `b` varchar(32) DEFAULT NULL,
  `c` char(16) DEFAULT NULL,
  `d` date DEFAULT NULL,
  `e` double DEFAULT NULL,
  `f` bit(3) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `idx1` (`b`,`e`),
  KEY `idx2` (`c`,`d`),
  KEY `idx3` (`d`),
  KEY `idx4` (`e`,`b`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t1	idx3	1	8.5000
ANALYZE TABLE t1 PERSISTENT FOR COLUMNS(b) INDEXES(idx1, idx4);
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx4	3	1.1304
test	t1	idx4	2	1.6875
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t1	idx3	1	8.5000
test	t1	idx4	1	6.2000
test	t1	idx1	2	1.6875
test	t1	idx1	1	6.4000
SELECT * INTO OUTFILE 'MYSQLTEST_VARDIR/tmp/save_column_stat'
  FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY '\n'
  FROM mysql.column_stat WHERE column_name='b';
SELECT * INTO OUTFILE 'MYSQLTEST_VARDIR/tmp/save_index_stat'
  FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY '\n'
  FROM mysql.index_stat WHERE index_name IN ('idx1', 'idx4');
ALTER TABLE t1 CHANGE COLUMN b x varchar(30);
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `x` varchar(30) DEFAULT NULL,
  `c` char(16) DEFAULT NULL,
  `d` date DEFAULT NULL,
  `e` double DEFAULT NULL,
  `f` bit(3) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `idx1` (`x`,`e`),
  KEY `idx2` (`c`,`d`),
  KEY `idx3` (`d`),
  KEY `idx4` (`e`,`x`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx4	3	1.1304
test	t1	idx4	2	1.6875
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t1	idx3	1	8.5000
test	t1	idx4	1	6.2000
test	t1	idx1	2	1.6875
test	t1	idx1	1	6.4000
ALTER TABLE t1 CHANGE COLUMN x b varchar(32);
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `b` varchar(32) DEFAULT NULL,
  `c` char(16) DEFAULT NULL,
  `d` date DEFAULT NULL,
  `e` double DEFAULT NULL,
  `f` bit(3) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `idx1` (`b`,`e`),
  KEY `idx2` (`c`,`d`),
  KEY `idx3` (`d`),
  KEY `idx4` (`e`,`b`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t1	idx3	1	8.5000
LOAD DATA INFILE 'MYSQLTEST_VARDIR/tmp/save_column_stat'
  INTO TABLE mysql.column_stat
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY '\n';
LOAD DATA INFILE 'MYSQLTEST_VARDIR/tmp/save_index_stat'
  INTO TABLE mysql.index_stat
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY '\n';
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx4	3	1.1304
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t1	idx3	1	8.5000
test	t1	idx4	2	1.6875
test	t1	idx4	1	6.2000
test	t1	idx1	2	1.6875
test	t1	idx1	1	6.4000
ALTER TABLE t1 DROP COLUMN b;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `c` char(16) DEFAULT NULL,
  `d` date DEFAULT NULL,
  `e` double DEFAULT NULL,
  `f` bit(3) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `idx1` (`e`),
  KEY `idx2` (`c`,`d`),
  KEY `idx3` (`d`),
  KEY `idx4` (`e`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t1	idx3	1	8.5000
DROP INDEX idx2 ON t1;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `c` char(16) DEFAULT NULL,
  `d` date DEFAULT NULL,
  `e` double DEFAULT NULL,
  `f` bit(3) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `idx1` (`e`),
  KEY `idx3` (`d`),
  KEY `idx4` (`e`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx3	1	8.5000
DROP INDEX idx1 ON t1;
DROP INDEX idx4 ON t1;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `c` char(16) DEFAULT NULL,
  `d` date DEFAULT NULL,
  `e` double DEFAULT NULL,
  `f` bit(3) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `idx3` (`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
ALTER TABLE t1 ADD COLUMN b varchar(32);
CREATE INDEX idx1 ON t1(b, e);
CREATE INDEX idx2 ON t1(c, d);
CREATE INDEX idx4 ON t1(e, b, d);
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `c` char(16) DEFAULT NULL,
  `d` date DEFAULT NULL,
  `e` double DEFAULT NULL,
  `f` bit(3) DEFAULT NULL,
  `b` varchar(32) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `idx3` (`d`),
  KEY `idx1` (`b`,`e`),
  KEY `idx2` (`c`,`d`),
  KEY `idx4` (`e`,`b`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx3	1	8.5000
ANALYZE TABLE t1 PERSISTENT FOR COLUMNS(b) INDEXES(idx1, idx2, idx4);
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	b	NULL	NULL	1.0000	NULL	NULL
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx2	1	7.0000
test	t1	idx1	2	NULL
test	t1	idx1	1	NULL
test	t1	idx3	1	8.5000
test	t1	idx2	2	2.3846
test	t1	idx4	1	6.2000
test	t1	idx4	2	NULL
test	t1	idx4	3	NULL
UPDATE t1 SET b=(SELECT b FROM t0 WHERE t0.a= t1.a);
ANALYZE TABLE t1 PERSISTENT FOR COLUMNS(b) INDEXES(idx1, idx2, idx4);
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx2	1	7.0000
test	t1	idx1	2	1.6875
test	t1	idx1	1	6.4000
test	t1	idx3	1	8.5000
test	t1	idx2	2	2.3846
test	t1	idx4	1	6.2000
test	t1	idx4	2	1.6875
test	t1	idx4	3	1.1304
ALTER TABLE t1 DROP COLUMN b,
DROP INDEX idx1, DROP INDEX idx2, DROP INDEX idx4;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `c` char(16) DEFAULT NULL,
  `d` date DEFAULT NULL,
  `e` double DEFAULT NULL,
  `f` bit(3) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `idx3` (`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx3	1	8.5000
ALTER TABLE t1 ADD COLUMN b varchar(32);
ALTER TABLE t1 
ADD INDEX idx1 (b, e), ADD INDEX idx2 (c, d), ADD INDEX idx4 (e, b, d);
UPDATE t1 SET b=(SELECT b FROM t0 WHERE t0.a= t1.a);
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `c` char(16) DEFAULT NULL,
  `d` date DEFAULT NULL,
  `e` double DEFAULT NULL,
  `f` bit(3) DEFAULT NULL,
  `b` varchar(32) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `idx3` (`d`),
  KEY `idx1` (`b`,`e`),
  KEY `idx2` (`c`,`d`),
  KEY `idx4` (`e`,`b`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx3	1	8.5000
ANALYZE TABLE t1 PERSISTENT FOR COLUMNS(b) INDEXES(idx1, idx2, idx4);
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx4	1	6.2000
test	t1	idx4	2	1.6875
test	t1	idx3	1	8.5000
test	t1	idx2	2	2.3846
test	t1	idx2	1	7.0000
test	t1	idx1	2	1.6875
test	t1	idx1	1	6.4000
test	t1	idx4	3	1.1304
DELETE FROM mysql.table_stat;
DELETE FROM mysql.column_stat;
DELETE FROM mysql.index_stat;
ANALYZE TABLE t1 PERSISTENT FOR COLUMNS() INDEXES();
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Table is already up to date
SELECT * FROM mysql.table_stat;
db_name	table_name	cardinality
test	t1	40
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
ANALYZE TABLE t1 PERSISTENT FOR COLUMNS(c,e,b) INDEXES(idx2,idx4);
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Table is already up to date
SELECT * FROM mysql.table_stat;
db_name	table_name	cardinality
test	t1	40
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t1	idx4	1	6.2000
test	t1	idx4	2	1.6875
test	t1	idx4	3	1.1304
DELETE FROM mysql.table_stat;
DELETE FROM mysql.column_stat;
DELETE FROM mysql.index_stat;
ANALYZE TABLE t1 PERSISTENT FOR COLUMNS ALL INDEXES ALL;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Table is already up to date
SELECT * FROM mysql.table_stat;
db_name	table_name	cardinality
test	t1	40
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
test	t1	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx3	1	8.5000
test	t1	idx1	1	6.4000
test	t1	idx1	2	1.6875
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t1	idx4	1	6.2000
test	t1	idx4	2	1.6875
test	t1	idx4	3	1.1304
CREATE TABLE t2 LIKE t1;
ALTER TABLE t2 ENGINE=InnoDB;
INSERT INTO t2 SELECT * FROM t1;
ANALYZE TABLE t2;
Table	Op	Msg_type	Msg_text
test.t2	analyze	status	OK
SELECT * FROM mysql.table_stat;
db_name	table_name	cardinality
test	t1	40
test	t2	40
SELECT * FROM mysql.column_stat ORDER BY column_name;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t2	a	0	49	0.0000	4.0000	1.0000
test	t1	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
test	t2	b	vvvvvvvvvvvvv	zzzzzzzzzzzzzzzzzz	0.2000	17.1250	6.4000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t2	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t2	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t2	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
test	t2	f	1	5	0.2000	1.0000	6.4000
SELECT * FROM mysql.index_stat ORDER BY index_name, prefix_arity, table_name;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t2	PRIMARY	1	1.0000
test	t1	idx1	1	6.4000
test	t2	idx1	1	6.4000
test	t1	idx1	2	1.6875
test	t2	idx1	2	1.6875
test	t1	idx2	1	7.0000
test	t2	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t2	idx2	2	2.3846
test	t1	idx3	1	8.5000
test	t2	idx3	1	8.5000
test	t1	idx4	1	6.2000
test	t2	idx4	1	6.2000
test	t1	idx4	2	1.6875
test	t2	idx4	2	1.6875
test	t1	idx4	3	1.1304
test	t2	idx4	3	1.1304
DELETE FROM mysql.table_stat;
DELETE FROM mysql.column_stat;
DELETE FROM mysql.index_stat;
ALTER TABLE t1
DROP INDEX idx1,
DROP INDEX idx4;
ALTER TABLE t1
MODIFY COLUMN b text,
ADD INDEX idx1 (b(4), e), 
ADD INDEX idx4 (e, b(4), d);
ANALYZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
SELECT * FROM mysql.column_stat;
db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
test	t1	a	0	49	0.0000	4.0000	1.0000
test	t1	c	aaaa	dddddddd	0.1250	6.6571	7.0000
test	t1	d	1989-03-12	1999-07-23	0.1500	3.0000	8.5000
test	t1	e	0.01	0.112	0.2250	8.0000	6.2000
test	t1	f	1	5	0.2000	1.0000	6.4000
test	t1	b	NULL	NULL	0.2000	17.1250	NULL
SELECT * FROM mysql.index_stat;
db_name	table_name	index_name	prefix_arity	avg_frequency
test	t1	PRIMARY	1	1.0000
test	t1	idx3	1	8.5000
test	t1	idx2	1	7.0000
test	t1	idx2	2	2.3846
test	t1	idx1	1	NULL
test	t1	idx1	2	NULL
test	t1	idx4	1	6.2000
test	t1	idx4	2	NULL
test	t1	idx4	3	NULL
DROP TABLE t1,t2;
DELETE FROM mysql.table_stat;
DELETE FROM mysql.column_stat;
DELETE FROM mysql.index_stat;
set use_stat_tables='never';
set names utf8;
CREATE DATABASE world;
use world;
CREATE TABLE Country (
Code char(3) NOT NULL default '',
Name char(52) NOT NULL default '',
SurfaceArea float(10,2) NOT NULL default '0.00',
Population int(11) NOT NULL default '0',
Capital int(11) default NULL,
PRIMARY KEY  (Code),
UNIQUE INDEX (Name)
) CHARACTER SET utf8 COLLATE utf8_bin;
CREATE TABLE City (
ID int(11) NOT NULL auto_increment,
Name char(35) NOT NULL default '',
Country char(3) NOT NULL default '',
Population int(11) NOT NULL default '0',
PRIMARY KEY  (ID),
INDEX (Population),
INDEX (Country) 
) CHARACTER SET utf8 COLLATE utf8_bin;
CREATE TABLE CountryLanguage (
Country char(3) NOT NULL default '',
Language char(30) NOT NULL default '',
Percentage float(3,1) NOT NULL default '0.0',
PRIMARY KEY  (Country, Language),
INDEX (Percentage)
) CHARACTER SET utf8 COLLATE utf8_bin;
set use_stat_tables='preferably';
ANALYZE TABLE Country, City, CountryLanguage;
SELECT UPPER(db_name), UPPER(table_name), cardinality
FROM mysql.table_stat;
UPPER(db_name)	UPPER(table_name)	cardinality
WORLD	COUNTRY	239
WORLD	CITY	4079
WORLD	COUNTRYLANGUAGE	984
SELECT UPPER(db_name), UPPER(table_name), 
column_name, min_value, max_value, nulls_ratio, avg_length, avg_frequency
FROM mysql.column_stat;
UPPER(db_name)	UPPER(table_name)	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
WORLD	COUNTRY	Code	ABW	ZWE	0.0000	3.0000	1.0000
WORLD	COUNTRY	Name	Afghanistan	Zimbabwe	0.0000	10.1088	1.0000
WORLD	COUNTRY	SurfaceArea	0.40	17075400.00	0.0000	4.0000	1.0042
WORLD	COUNTRY	Population	0	1277558000	0.0000	4.0000	1.0575
WORLD	COUNTRY	Capital	1	4074	0.0293	4.0000	1.0000
WORLD	CITY	ID	1	4079	0.0000	4.0000	1.0000
WORLD	CITY	Name	A Coruña (La Coruña)	Ürgenc	0.0000	8.6416	1.0195
WORLD	CITY	Country	ABW	ZWE	0.0000	3.0000	17.5819
WORLD	CITY	Population	42	10500000	0.0000	4.0000	1.0467
WORLD	COUNTRYLANGUAGE	Country	ABW	ZWE	0.0000	3.0000	4.2232
WORLD	COUNTRYLANGUAGE	Language	Abhyasi	[South]Mande	0.0000	7.1778	2.1532
WORLD	COUNTRYLANGUAGE	Percentage	0.0	99.9	0.0000	4.0000	2.7640
SELECT UPPER(db_name), UPPER(table_name),
index_name, prefix_arity, avg_frequency
FROM mysql.index_stat;
UPPER(db_name)	UPPER(table_name)	index_name	prefix_arity	avg_frequency
WORLD	COUNTRY	PRIMARY	1	1.0000
WORLD	COUNTRY	Name	1	1.0000
WORLD	CITY	PRIMARY	1	1.0000
WORLD	CITY	Population	1	1.0467
WORLD	CITY	Country	1	17.5819
WORLD	COUNTRYLANGUAGE	PRIMARY	1	4.2232
WORLD	COUNTRYLANGUAGE	PRIMARY	2	1.0000
WORLD	COUNTRYLANGUAGE	Percentage	1	2.7640
use test;
set use_stat_tables='never';
CREATE DATABASE world_innodb;
use world_innodb;
CREATE TABLE Country (
Code char(3) NOT NULL default '',
Name char(52) NOT NULL default '',
SurfaceArea float(10,2) NOT NULL default '0.00',
Population int(11) NOT NULL default '0',
Capital int(11) default NULL,
PRIMARY KEY  (Code),
UNIQUE INDEX (Name)
) CHARACTER SET utf8 COLLATE utf8_bin;
CREATE TABLE City (
ID int(11) NOT NULL auto_increment,
Name char(35) NOT NULL default '',
Country char(3) NOT NULL default '',
Population int(11) NOT NULL default '0',
PRIMARY KEY  (ID),
INDEX (Population),
INDEX (Country) 
) CHARACTER SET utf8 COLLATE utf8_bin;
CREATE TABLE CountryLanguage (
Country char(3) NOT NULL default '',
Language char(30) NOT NULL default '',
Percentage float(3,1) NOT NULL default '0.0',
PRIMARY KEY  (Country, Language),
INDEX (Percentage)
) CHARACTER SET utf8 COLLATE utf8_bin;
ALTER TABLE Country ENGINE=InnoDB;
ALTER TABLE City ENGINE=InnoDB;
ALTER TABLE CountryLanguage ENGINE=InnoDB;
set use_stat_tables='preferably';
ANALYZE TABLE Country, City, CountryLanguage;
SELECT UPPER(db_name), UPPER(table_name), cardinality
FROM mysql.table_stat;
UPPER(db_name)	UPPER(table_name)	cardinality
WORLD	COUNTRY	239
WORLD	CITY	4079
WORLD	COUNTRYLANGUAGE	984
WORLD_INNODB	COUNTRY	239
WORLD_INNODB	CITY	4079
WORLD_INNODB	COUNTRYLANGUAGE	984
SELECT UPPER(db_name), UPPER(table_name), 
column_name, min_value, max_value, nulls_ratio, avg_length, avg_frequency
FROM mysql.column_stat;
UPPER(db_name)	UPPER(table_name)	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
WORLD	COUNTRY	Code	ABW	ZWE	0.0000	3.0000	1.0000
WORLD	COUNTRY	Name	Afghanistan	Zimbabwe	0.0000	10.1088	1.0000
WORLD	COUNTRY	SurfaceArea	0.40	17075400.00	0.0000	4.0000	1.0042
WORLD	COUNTRY	Population	0	1277558000	0.0000	4.0000	1.0575
WORLD	COUNTRY	Capital	1	4074	0.0293	4.0000	1.0000
WORLD	CITY	ID	1	4079	0.0000	4.0000	1.0000
WORLD	CITY	Name	A Coruña (La Coruña)	Ürgenc	0.0000	8.6416	1.0195
WORLD	CITY	Country	ABW	ZWE	0.0000	3.0000	17.5819
WORLD	CITY	Population	42	10500000	0.0000	4.0000	1.0467
WORLD	COUNTRYLANGUAGE	Country	ABW	ZWE	0.0000	3.0000	4.2232
WORLD	COUNTRYLANGUAGE	Language	Abhyasi	[South]Mande	0.0000	7.1778	2.1532
WORLD	COUNTRYLANGUAGE	Percentage	0.0	99.9	0.0000	4.0000	2.7640
WORLD_INNODB	COUNTRY	Code	ABW	ZWE	0.0000	3.0000	1.0000
WORLD_INNODB	COUNTRY	Name	Afghanistan	Zimbabwe	0.0000	10.1088	1.0000
WORLD_INNODB	COUNTRY	SurfaceArea	0.40	17075400.00	0.0000	4.0000	1.0042
WORLD_INNODB	COUNTRY	Population	0	1277558000	0.0000	4.0000	1.0575
WORLD_INNODB	COUNTRY	Capital	1	4074	0.0293	4.0000	1.0000
WORLD_INNODB	CITY	ID	1	4079	0.0000	4.0000	1.0000
WORLD_INNODB	CITY	Name	A Coruña (La Coruña)	Ürgenc	0.0000	8.6416	1.0195
WORLD_INNODB	CITY	Country	ABW	ZWE	0.0000	3.0000	17.5819
WORLD_INNODB	CITY	Population	42	10500000	0.0000	4.0000	1.0467
WORLD_INNODB	COUNTRYLANGUAGE	Country	ABW	ZWE	0.0000	3.0000	4.2232
WORLD_INNODB	COUNTRYLANGUAGE	Language	Abhyasi	[South]Mande	0.0000	7.1778	2.1532
WORLD_INNODB	COUNTRYLANGUAGE	Percentage	0.0	99.9	0.0000	4.0000	2.7640
SELECT UPPER(db_name), UPPER(table_name),
index_name, prefix_arity, avg_frequency
FROM mysql.index_stat;
UPPER(db_name)	UPPER(table_name)	index_name	prefix_arity	avg_frequency
WORLD	COUNTRY	PRIMARY	1	1.0000
WORLD	COUNTRY	Name	1	1.0000
WORLD	CITY	PRIMARY	1	1.0000
WORLD	CITY	Population	1	1.0467
WORLD	CITY	Country	1	17.5819
WORLD	COUNTRYLANGUAGE	PRIMARY	1	4.2232
WORLD	COUNTRYLANGUAGE	PRIMARY	2	1.0000
WORLD	COUNTRYLANGUAGE	Percentage	1	2.7640
WORLD_INNODB	COUNTRY	PRIMARY	1	1.0000
WORLD_INNODB	COUNTRY	Name	1	1.0000
WORLD_INNODB	CITY	PRIMARY	1	1.0000
WORLD_INNODB	CITY	Population	1	1.0467
WORLD_INNODB	CITY	Country	1	17.5819
WORLD_INNODB	COUNTRYLANGUAGE	PRIMARY	1	4.2232
WORLD_INNODB	COUNTRYLANGUAGE	PRIMARY	2	1.0000
WORLD_INNODB	COUNTRYLANGUAGE	Percentage	1	2.7640
use test;
DROP DATABASE world;
SELECT UPPER(db_name), UPPER(table_name), cardinality
FROM mysql.table_stat;
UPPER(db_name)	UPPER(table_name)	cardinality
WORLD_INNODB	COUNTRY	239
WORLD_INNODB	CITY	4079
WORLD_INNODB	COUNTRYLANGUAGE	984
SELECT UPPER(db_name), UPPER(table_name), 
column_name, min_value, max_value, nulls_ratio, avg_length, avg_frequency
FROM mysql.column_stat;
UPPER(db_name)	UPPER(table_name)	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
WORLD_INNODB	COUNTRY	Code	ABW	ZWE	0.0000	3.0000	1.0000
WORLD_INNODB	COUNTRY	Name	Afghanistan	Zimbabwe	0.0000	10.1088	1.0000
WORLD_INNODB	COUNTRY	SurfaceArea	0.40	17075400.00	0.0000	4.0000	1.0042
WORLD_INNODB	COUNTRY	Population	0	1277558000	0.0000	4.0000	1.0575
WORLD_INNODB	COUNTRY	Capital	1	4074	0.0293	4.0000	1.0000
WORLD_INNODB	CITY	ID	1	4079	0.0000	4.0000	1.0000
WORLD_INNODB	CITY	Name	A Coruña (La Coruña)	Ürgenc	0.0000	8.6416	1.0195
WORLD_INNODB	CITY	Country	ABW	ZWE	0.0000	3.0000	17.5819
WORLD_INNODB	CITY	Population	42	10500000	0.0000	4.0000	1.0467
WORLD_INNODB	COUNTRYLANGUAGE	Country	ABW	ZWE	0.0000	3.0000	4.2232
WORLD_INNODB	COUNTRYLANGUAGE	Language	Abhyasi	[South]Mande	0.0000	7.1778	2.1532
WORLD_INNODB	COUNTRYLANGUAGE	Percentage	0.0	99.9	0.0000	4.0000	2.7640
SELECT UPPER(db_name), UPPER(table_name),
index_name, prefix_arity, avg_frequency
FROM mysql.index_stat;
UPPER(db_name)	UPPER(table_name)	index_name	prefix_arity	avg_frequency
WORLD_INNODB	COUNTRY	PRIMARY	1	1.0000
WORLD_INNODB	COUNTRY	Name	1	1.0000
WORLD_INNODB	CITY	PRIMARY	1	1.0000
WORLD_INNODB	CITY	Population	1	1.0467
WORLD_INNODB	CITY	Country	1	17.5819
WORLD_INNODB	COUNTRYLANGUAGE	PRIMARY	1	4.2232
WORLD_INNODB	COUNTRYLANGUAGE	PRIMARY	2	1.0000
WORLD_INNODB	COUNTRYLANGUAGE	Percentage	1	2.7640
DROP DATABASE world_innodb;
SELECT UPPER(db_name), UPPER(table_name), cardinality
FROM mysql.table_stat;
UPPER(db_name)	UPPER(table_name)	cardinality
SELECT UPPER(db_name), UPPER(table_name), 
column_name, min_value, max_value, nulls_ratio, avg_length, avg_frequency
FROM mysql.column_stat;
UPPER(db_name)	UPPER(table_name)	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency
SELECT UPPER(db_name), UPPER(table_name),
index_name, prefix_arity, avg_frequency
FROM mysql.index_stat;
UPPER(db_name)	UPPER(table_name)	index_name	prefix_arity	avg_frequency
DELETE FROM mysql.table_stat;
DELETE FROM mysql.column_stat;
DELETE FROM mysql.index_stat;
set use_stat_tables=@save_use_stat_tables;