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CREATE PROCEDURE populate_t1(load_even INT)
BEGIN
DECLARE i int DEFAULT 1;
START TRANSACTION;
WHILE (i <= 10000) DO
IF i%2 = 0 AND load_even = 1 THEN
INSERT INTO t1 VALUES (i, i, CONCAT('a', i));
END IF;
IF i%2 != 0 AND load_even != 1 THEN
INSERT INTO t1 VALUES (i, i, CONCAT('a', i));
END IF;
SET i = i + 1;
END WHILE;
COMMIT;
END|
SELECT @@innodb_fill_factor;
@@innodb_fill_factor
100
CREATE TABLE t1(
class INT,
id INT,
title VARCHAR(100)
) ENGINE=InnoDB ROW_FORMAT=REDUNDANT;
SELECT COUNT(*) FROM t1;
COUNT(*)
5000
/* Create index. */
CREATE INDEX idx_id ON t1(id);
CREATE INDEX idx_title ON t1(title);
/* Check table. */
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
/* Select by index. */
EXPLAIN SELECT * FROM t1 WHERE id = 10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref idx_id idx_id 5 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`class` AS `class`,`test`.`t1`.`id` AS `id`,`test`.`t1`.`title` AS `title` from `test`.`t1` where (`test`.`t1`.`id` = 10)
EXPLAIN SELECT * FROM t1 WHERE title = 'a10';
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref idx_title idx_title 103 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`class` AS `class`,`test`.`t1`.`id` AS `id`,`test`.`t1`.`title` AS `title` from `test`.`t1` where (`test`.`t1`.`title` = 'a10')
SELECT * FROM t1 WHERE id = 10;
class id title
10 10 a10
SELECT * FROM t1 WHERE title = 'a10';
class id title
10 10 a10
SELECT * FROM t1 WHERE id = 5000;
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE title = 'a5000';
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE id = 10000;
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE title = 'a10000';
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE id = 10010;
class id title
SELECT * FROM t1 WHERE title = 'a10010';
class id title
/*Insert/Update/Delete. */
DELETE FROM t1 WHERE id < 4010 AND id > 3990;
INSERT INTO t1 VALUES(4000, 4000, 'b4000');
UPDATE t1 SET title = CONCAT('b', id) WHERE id < 3010 AND id > 2990;
SELECT * FROM t1 WHERE id = 3000;
class id title
3000 3000 b3000
SELECT * FROM t1 WHERE title = 'a3000';
class id title
SELECT * FROM t1 WHERE title = 'b3000';
class id title
3000 3000 b3000
SELECT * FROM t1 WHERE id = 4000;
class id title
4000 4000 b4000
SELECT * FROM t1 WHERE title = 'a4000';
class id title
SELECT * FROM t1 WHERE title = 'b4000';
class id title
4000 4000 b4000
SELECT * FROM t1 WHERE id = 4001;
class id title
SELECT * FROM t1 WHERE title = 'a4001';
class id title
SELECT COUNT(*) FROM t1;
COUNT(*)
9992
/* Add column. */
ALTER TABLE t1 ADD COLUMN content TEXT;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT * FROM t1 WHERE id = 10;
class id title content
10 10 a10 NULL
SELECT * FROM t1 WHERE title = 'a10';
class id title content
10 10 a10 NULL
SELECT * FROM t1 WHERE id = 5000;
class id title content
5000 5000 a5000 NULL
SELECT * FROM t1 WHERE title = 'a5000';
class id title content
5000 5000 a5000 NULL
SELECT * FROM t1 WHERE id = 10000;
class id title content
10000 10000 a10000 NULL
SELECT * FROM t1 WHERE title = 'a10000';
class id title content
10000 10000 a10000 NULL
SELECT * FROM t1 WHERE id = 10010;
class id title content
SELECT * FROM t1 WHERE title = 'a10010';
class id title content
/* Drop column. */
ALTER TABLE t1 DROP COLUMN content;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT * FROM t1 WHERE id = 10;
class id title
10 10 a10
SELECT * FROM t1 WHERE title = 'a10';
class id title
10 10 a10
SELECT * FROM t1 WHERE id = 5000;
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE title = 'a5000';
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE id = 10000;
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE title = 'a10000';
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE id = 10010;
class id title
SELECT * FROM t1 WHERE title = 'a10010';
class id title
DROP TABLE t1;
CREATE TABLE t1(
a INT PRIMARY KEY,
b TEXT,
c TEXT) ENGINE=InnoDB ROW_FORMAT=REDUNDANT;
ALTER TABLE t1 ADD INDEX `idx` (a,b(5));
SELECT CHAR_LENGTH(b) FROM t1 WHERE a=4975;
CHAR_LENGTH(b)
10000
SELECT b=REPEAT(CONCAT('a',4975),2000) FROM t1 WHERE a=4975 AND b like 'a4975%';
b=REPEAT(CONCAT('a',4975),2000)
1
UPDATE t1 SET b = REPEAT(CONCAT('b',4975),2000) WHERE a=4975 AND b like 'a4975%';
SELECT b=REPEAT(CONCAT('a',4975),2000) FROM t1 WHERE a=4975 AND b like 'a4975%';
b=REPEAT(CONCAT('a',4975),2000)
SELECT b=REPEAT(CONCAT('b',4975),2000) FROM t1 WHERE a=4975 AND b like 'b4975%';
b=REPEAT(CONCAT('b',4975),2000)
1
DELETE FROM t1 WHERE a=4975 AND b like 'b4975%';
SELECT b=REPEAT(CONCAT('b',4975),2000) FROM t1 WHERE a=4975 AND b like 'b4975%';
b=REPEAT(CONCAT('b',4975),2000)
ALTER TABLE t1 DROP COLUMN c;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT CHAR_LENGTH(b) FROM t1 WHERE a=4975;
CHAR_LENGTH(b)
DROP TABLE t1;
DROP PROCEDURE populate_t1;
CREATE PROCEDURE populate_t1(load_even INT)
BEGIN
DECLARE i int DEFAULT 1;
START TRANSACTION;
WHILE (i <= 10000) DO
IF i%2 = 0 AND load_even = 1 THEN
INSERT INTO t1 VALUES (i, i, CONCAT('a', i));
END IF;
IF i%2 != 0 AND load_even != 1 THEN
INSERT INTO t1 VALUES (i, i, CONCAT('a', i));
END IF;
SET i = i + 1;
END WHILE;
COMMIT;
END|
SELECT @@innodb_fill_factor;
@@innodb_fill_factor
100
CREATE TABLE t1(
class INT,
id INT,
title VARCHAR(100)
) ENGINE=InnoDB ROW_FORMAT=COMPACT;
SELECT COUNT(*) FROM t1;
COUNT(*)
5000
/* Create index. */
CREATE INDEX idx_id ON t1(id);
CREATE INDEX idx_title ON t1(title);
/* Check table. */
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
/* Select by index. */
EXPLAIN SELECT * FROM t1 WHERE id = 10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref idx_id idx_id 5 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`class` AS `class`,`test`.`t1`.`id` AS `id`,`test`.`t1`.`title` AS `title` from `test`.`t1` where (`test`.`t1`.`id` = 10)
EXPLAIN SELECT * FROM t1 WHERE title = 'a10';
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref idx_title idx_title 103 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`class` AS `class`,`test`.`t1`.`id` AS `id`,`test`.`t1`.`title` AS `title` from `test`.`t1` where (`test`.`t1`.`title` = 'a10')
SELECT * FROM t1 WHERE id = 10;
class id title
10 10 a10
SELECT * FROM t1 WHERE title = 'a10';
class id title
10 10 a10
SELECT * FROM t1 WHERE id = 5000;
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE title = 'a5000';
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE id = 10000;
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE title = 'a10000';
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE id = 10010;
class id title
SELECT * FROM t1 WHERE title = 'a10010';
class id title
/*Insert/Update/Delete. */
DELETE FROM t1 WHERE id < 4010 AND id > 3990;
INSERT INTO t1 VALUES(4000, 4000, 'b4000');
UPDATE t1 SET title = CONCAT('b', id) WHERE id < 3010 AND id > 2990;
SELECT * FROM t1 WHERE id = 3000;
class id title
3000 3000 b3000
SELECT * FROM t1 WHERE title = 'a3000';
class id title
SELECT * FROM t1 WHERE title = 'b3000';
class id title
3000 3000 b3000
SELECT * FROM t1 WHERE id = 4000;
class id title
4000 4000 b4000
SELECT * FROM t1 WHERE title = 'a4000';
class id title
SELECT * FROM t1 WHERE title = 'b4000';
class id title
4000 4000 b4000
SELECT * FROM t1 WHERE id = 4001;
class id title
SELECT * FROM t1 WHERE title = 'a4001';
class id title
SELECT COUNT(*) FROM t1;
COUNT(*)
9992
/* Add column. */
ALTER TABLE t1 ADD COLUMN content TEXT;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT * FROM t1 WHERE id = 10;
class id title content
10 10 a10 NULL
SELECT * FROM t1 WHERE title = 'a10';
class id title content
10 10 a10 NULL
SELECT * FROM t1 WHERE id = 5000;
class id title content
5000 5000 a5000 NULL
SELECT * FROM t1 WHERE title = 'a5000';
class id title content
5000 5000 a5000 NULL
SELECT * FROM t1 WHERE id = 10000;
class id title content
10000 10000 a10000 NULL
SELECT * FROM t1 WHERE title = 'a10000';
class id title content
10000 10000 a10000 NULL
SELECT * FROM t1 WHERE id = 10010;
class id title content
SELECT * FROM t1 WHERE title = 'a10010';
class id title content
/* Drop column. */
ALTER TABLE t1 DROP COLUMN content;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT * FROM t1 WHERE id = 10;
class id title
10 10 a10
SELECT * FROM t1 WHERE title = 'a10';
class id title
10 10 a10
SELECT * FROM t1 WHERE id = 5000;
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE title = 'a5000';
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE id = 10000;
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE title = 'a10000';
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE id = 10010;
class id title
SELECT * FROM t1 WHERE title = 'a10010';
class id title
DROP TABLE t1;
CREATE TABLE t1(
a INT PRIMARY KEY,
b TEXT,
c TEXT) ENGINE=InnoDB ROW_FORMAT=COMPACT;
ALTER TABLE t1 ADD INDEX `idx` (a,b(5));
SELECT CHAR_LENGTH(b) FROM t1 WHERE a=4975;
CHAR_LENGTH(b)
10000
SELECT b=REPEAT(CONCAT('a',4975),2000) FROM t1 WHERE a=4975 AND b like 'a4975%';
b=REPEAT(CONCAT('a',4975),2000)
1
UPDATE t1 SET b = REPEAT(CONCAT('b',4975),2000) WHERE a=4975 AND b like 'a4975%';
SELECT b=REPEAT(CONCAT('a',4975),2000) FROM t1 WHERE a=4975 AND b like 'a4975%';
b=REPEAT(CONCAT('a',4975),2000)
SELECT b=REPEAT(CONCAT('b',4975),2000) FROM t1 WHERE a=4975 AND b like 'b4975%';
b=REPEAT(CONCAT('b',4975),2000)
1
DELETE FROM t1 WHERE a=4975 AND b like 'b4975%';
SELECT b=REPEAT(CONCAT('b',4975),2000) FROM t1 WHERE a=4975 AND b like 'b4975%';
b=REPEAT(CONCAT('b',4975),2000)
ALTER TABLE t1 DROP COLUMN c;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT CHAR_LENGTH(b) FROM t1 WHERE a=4975;
CHAR_LENGTH(b)
DROP TABLE t1;
DROP PROCEDURE populate_t1;
CREATE PROCEDURE populate_t1(load_even INT)
BEGIN
DECLARE i int DEFAULT 1;
START TRANSACTION;
WHILE (i <= 10000) DO
IF i%2 = 0 AND load_even = 1 THEN
INSERT INTO t1 VALUES (i, i, CONCAT('a', i));
END IF;
IF i%2 != 0 AND load_even != 1 THEN
INSERT INTO t1 VALUES (i, i, CONCAT('a', i));
END IF;
SET i = i + 1;
END WHILE;
COMMIT;
END|
SELECT @@innodb_fill_factor;
@@innodb_fill_factor
100
CREATE TABLE t1(
class INT,
id INT,
title VARCHAR(100)
) ENGINE=InnoDB ROW_FORMAT=DYNAMIC;
SELECT COUNT(*) FROM t1;
COUNT(*)
5000
/* Create index. */
CREATE INDEX idx_id ON t1(id);
CREATE INDEX idx_title ON t1(title);
/* Check table. */
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
/* Select by index. */
EXPLAIN SELECT * FROM t1 WHERE id = 10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref idx_id idx_id 5 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`class` AS `class`,`test`.`t1`.`id` AS `id`,`test`.`t1`.`title` AS `title` from `test`.`t1` where (`test`.`t1`.`id` = 10)
EXPLAIN SELECT * FROM t1 WHERE title = 'a10';
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref idx_title idx_title 103 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`class` AS `class`,`test`.`t1`.`id` AS `id`,`test`.`t1`.`title` AS `title` from `test`.`t1` where (`test`.`t1`.`title` = 'a10')
SELECT * FROM t1 WHERE id = 10;
class id title
10 10 a10
SELECT * FROM t1 WHERE title = 'a10';
class id title
10 10 a10
SELECT * FROM t1 WHERE id = 5000;
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE title = 'a5000';
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE id = 10000;
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE title = 'a10000';
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE id = 10010;
class id title
SELECT * FROM t1 WHERE title = 'a10010';
class id title
/*Insert/Update/Delete. */
DELETE FROM t1 WHERE id < 4010 AND id > 3990;
INSERT INTO t1 VALUES(4000, 4000, 'b4000');
UPDATE t1 SET title = CONCAT('b', id) WHERE id < 3010 AND id > 2990;
SELECT * FROM t1 WHERE id = 3000;
class id title
3000 3000 b3000
SELECT * FROM t1 WHERE title = 'a3000';
class id title
SELECT * FROM t1 WHERE title = 'b3000';
class id title
3000 3000 b3000
SELECT * FROM t1 WHERE id = 4000;
class id title
4000 4000 b4000
SELECT * FROM t1 WHERE title = 'a4000';
class id title
SELECT * FROM t1 WHERE title = 'b4000';
class id title
4000 4000 b4000
SELECT * FROM t1 WHERE id = 4001;
class id title
SELECT * FROM t1 WHERE title = 'a4001';
class id title
SELECT COUNT(*) FROM t1;
COUNT(*)
9992
/* Add column. */
ALTER TABLE t1 ADD COLUMN content TEXT;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT * FROM t1 WHERE id = 10;
class id title content
10 10 a10 NULL
SELECT * FROM t1 WHERE title = 'a10';
class id title content
10 10 a10 NULL
SELECT * FROM t1 WHERE id = 5000;
class id title content
5000 5000 a5000 NULL
SELECT * FROM t1 WHERE title = 'a5000';
class id title content
5000 5000 a5000 NULL
SELECT * FROM t1 WHERE id = 10000;
class id title content
10000 10000 a10000 NULL
SELECT * FROM t1 WHERE title = 'a10000';
class id title content
10000 10000 a10000 NULL
SELECT * FROM t1 WHERE id = 10010;
class id title content
SELECT * FROM t1 WHERE title = 'a10010';
class id title content
/* Drop column. */
ALTER TABLE t1 DROP COLUMN content;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT * FROM t1 WHERE id = 10;
class id title
10 10 a10
SELECT * FROM t1 WHERE title = 'a10';
class id title
10 10 a10
SELECT * FROM t1 WHERE id = 5000;
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE title = 'a5000';
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE id = 10000;
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE title = 'a10000';
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE id = 10010;
class id title
SELECT * FROM t1 WHERE title = 'a10010';
class id title
DROP TABLE t1;
CREATE TABLE t1(
a INT PRIMARY KEY,
b TEXT,
c TEXT) ENGINE=InnoDB ROW_FORMAT=DYNAMIC;
ALTER TABLE t1 ADD INDEX `idx` (a,b(5));
SELECT CHAR_LENGTH(b) FROM t1 WHERE a=4975;
CHAR_LENGTH(b)
10000
SELECT b=REPEAT(CONCAT('a',4975),2000) FROM t1 WHERE a=4975 AND b like 'a4975%';
b=REPEAT(CONCAT('a',4975),2000)
1
UPDATE t1 SET b = REPEAT(CONCAT('b',4975),2000) WHERE a=4975 AND b like 'a4975%';
SELECT b=REPEAT(CONCAT('a',4975),2000) FROM t1 WHERE a=4975 AND b like 'a4975%';
b=REPEAT(CONCAT('a',4975),2000)
SELECT b=REPEAT(CONCAT('b',4975),2000) FROM t1 WHERE a=4975 AND b like 'b4975%';
b=REPEAT(CONCAT('b',4975),2000)
1
DELETE FROM t1 WHERE a=4975 AND b like 'b4975%';
SELECT b=REPEAT(CONCAT('b',4975),2000) FROM t1 WHERE a=4975 AND b like 'b4975%';
b=REPEAT(CONCAT('b',4975),2000)
ALTER TABLE t1 DROP COLUMN c;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT CHAR_LENGTH(b) FROM t1 WHERE a=4975;
CHAR_LENGTH(b)
DROP TABLE t1;
DROP PROCEDURE populate_t1;
CREATE PROCEDURE populate_t1(load_even INT)
BEGIN
DECLARE i int DEFAULT 1;
START TRANSACTION;
WHILE (i <= 10000) DO
IF i%2 = 0 AND load_even = 1 THEN
INSERT INTO t1 VALUES (i, i, CONCAT('a', i));
END IF;
IF i%2 != 0 AND load_even != 1 THEN
INSERT INTO t1 VALUES (i, i, CONCAT('a', i));
END IF;
SET i = i + 1;
END WHILE;
COMMIT;
END|
SELECT @@innodb_fill_factor;
@@innodb_fill_factor
100
SET GLOBAL innodb_file_per_table=1;
CREATE TABLE t1(
class INT,
id INT,
title VARCHAR(100)
) ENGINE=InnoDB ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=4;
SELECT COUNT(*) FROM t1;
COUNT(*)
5000
/* Create index. */
CREATE INDEX idx_id ON t1(id);
CREATE INDEX idx_title ON t1(title);
/* Check table. */
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
/* Select by index. */
EXPLAIN SELECT * FROM t1 WHERE id = 10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref idx_id idx_id 5 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`class` AS `class`,`test`.`t1`.`id` AS `id`,`test`.`t1`.`title` AS `title` from `test`.`t1` where (`test`.`t1`.`id` = 10)
EXPLAIN SELECT * FROM t1 WHERE title = 'a10';
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref idx_title idx_title 103 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`class` AS `class`,`test`.`t1`.`id` AS `id`,`test`.`t1`.`title` AS `title` from `test`.`t1` where (`test`.`t1`.`title` = 'a10')
SELECT * FROM t1 WHERE id = 10;
class id title
10 10 a10
SELECT * FROM t1 WHERE title = 'a10';
class id title
10 10 a10
SELECT * FROM t1 WHERE id = 5000;
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE title = 'a5000';
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE id = 10000;
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE title = 'a10000';
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE id = 10010;
class id title
SELECT * FROM t1 WHERE title = 'a10010';
class id title
/*Insert/Update/Delete. */
DELETE FROM t1 WHERE id < 4010 AND id > 3990;
INSERT INTO t1 VALUES(4000, 4000, 'b4000');
UPDATE t1 SET title = CONCAT('b', id) WHERE id < 3010 AND id > 2990;
SELECT * FROM t1 WHERE id = 3000;
class id title
3000 3000 b3000
SELECT * FROM t1 WHERE title = 'a3000';
class id title
SELECT * FROM t1 WHERE title = 'b3000';
class id title
3000 3000 b3000
SELECT * FROM t1 WHERE id = 4000;
class id title
4000 4000 b4000
SELECT * FROM t1 WHERE title = 'a4000';
class id title
SELECT * FROM t1 WHERE title = 'b4000';
class id title
4000 4000 b4000
SELECT * FROM t1 WHERE id = 4001;
class id title
SELECT * FROM t1 WHERE title = 'a4001';
class id title
SELECT COUNT(*) FROM t1;
COUNT(*)
9992
/* Add column. */
ALTER TABLE t1 ADD COLUMN content TEXT;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT * FROM t1 WHERE id = 10;
class id title content
10 10 a10 NULL
SELECT * FROM t1 WHERE title = 'a10';
class id title content
10 10 a10 NULL
SELECT * FROM t1 WHERE id = 5000;
class id title content
5000 5000 a5000 NULL
SELECT * FROM t1 WHERE title = 'a5000';
class id title content
5000 5000 a5000 NULL
SELECT * FROM t1 WHERE id = 10000;
class id title content
10000 10000 a10000 NULL
SELECT * FROM t1 WHERE title = 'a10000';
class id title content
10000 10000 a10000 NULL
SELECT * FROM t1 WHERE id = 10010;
class id title content
SELECT * FROM t1 WHERE title = 'a10010';
class id title content
/* Drop column. */
ALTER TABLE t1 DROP COLUMN content;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT * FROM t1 WHERE id = 10;
class id title
10 10 a10
SELECT * FROM t1 WHERE title = 'a10';
class id title
10 10 a10
SELECT * FROM t1 WHERE id = 5000;
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE title = 'a5000';
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE id = 10000;
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE title = 'a10000';
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE id = 10010;
class id title
SELECT * FROM t1 WHERE title = 'a10010';
class id title
DROP TABLE t1;
CREATE TABLE t1(
a INT PRIMARY KEY,
b BLOB,
c TEXT) ENGINE=InnoDB ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=4;
ALTER TABLE t1 ADD INDEX `idx` (a,b(5));
SELECT CHAR_LENGTH(b) FROM t1 WHERE a=4975;
CHAR_LENGTH(b)
10000
SELECT b=REPEAT(CONCAT('a',4975),2000) FROM t1 WHERE a=4975 AND b like 'a4975%';
b=REPEAT(CONCAT('a',4975),2000)
1
UPDATE t1 SET b = REPEAT(CONCAT('b',4975),2000) WHERE a=4975 AND b like 'a4975%';
SELECT b=REPEAT(CONCAT('a',4975),2000) FROM t1 WHERE a=4975 AND b like 'a4975%';
b=REPEAT(CONCAT('a',4975),2000)
SELECT b=REPEAT(CONCAT('b',4975),2000) FROM t1 WHERE a=4975 AND b like 'b4975%';
b=REPEAT(CONCAT('b',4975),2000)
1
DELETE FROM t1 WHERE a=4975 AND b like 'b4975%';
SELECT b=REPEAT(CONCAT('b',4975),2000) FROM t1 WHERE a=4975 AND b like 'b4975%';
b=REPEAT(CONCAT('b',4975),2000)
ALTER TABLE t1 DROP COLUMN c;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT CHAR_LENGTH(b) FROM t1 WHERE a=4975;
CHAR_LENGTH(b)
DROP TABLE t1;
SET GLOBAL innodb_file_per_table=default;
DROP PROCEDURE populate_t1;
SET GLOBAL innodb_fill_factor=10;
CREATE PROCEDURE populate_t1(load_even INT)
BEGIN
DECLARE i int DEFAULT 1;
START TRANSACTION;
WHILE (i <= 10000) DO
IF i%2 = 0 AND load_even = 1 THEN
INSERT INTO t1 VALUES (i, i, CONCAT('a', i));
END IF;
IF i%2 != 0 AND load_even != 1 THEN
INSERT INTO t1 VALUES (i, i, CONCAT('a', i));
END IF;
SET i = i + 1;
END WHILE;
COMMIT;
END|
SELECT @@innodb_fill_factor;
@@innodb_fill_factor
10
CREATE TABLE t1(
class INT,
id INT,
title VARCHAR(100)
) ENGINE=InnoDB ROW_FORMAT=COMPACT;
SELECT COUNT(*) FROM t1;
COUNT(*)
5000
/* Create index. */
CREATE INDEX idx_id ON t1(id);
CREATE INDEX idx_title ON t1(title);
/* Check table. */
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
/* Select by index. */
EXPLAIN SELECT * FROM t1 WHERE id = 10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref idx_id idx_id 5 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`class` AS `class`,`test`.`t1`.`id` AS `id`,`test`.`t1`.`title` AS `title` from `test`.`t1` where (`test`.`t1`.`id` = 10)
EXPLAIN SELECT * FROM t1 WHERE title = 'a10';
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref idx_title idx_title 103 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`class` AS `class`,`test`.`t1`.`id` AS `id`,`test`.`t1`.`title` AS `title` from `test`.`t1` where (`test`.`t1`.`title` = 'a10')
SELECT * FROM t1 WHERE id = 10;
class id title
10 10 a10
SELECT * FROM t1 WHERE title = 'a10';
class id title
10 10 a10
SELECT * FROM t1 WHERE id = 5000;
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE title = 'a5000';
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE id = 10000;
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE title = 'a10000';
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE id = 10010;
class id title
SELECT * FROM t1 WHERE title = 'a10010';
class id title
/*Insert/Update/Delete. */
DELETE FROM t1 WHERE id < 4010 AND id > 3990;
INSERT INTO t1 VALUES(4000, 4000, 'b4000');
UPDATE t1 SET title = CONCAT('b', id) WHERE id < 3010 AND id > 2990;
SELECT * FROM t1 WHERE id = 3000;
class id title
3000 3000 b3000
SELECT * FROM t1 WHERE title = 'a3000';
class id title
SELECT * FROM t1 WHERE title = 'b3000';
class id title
3000 3000 b3000
SELECT * FROM t1 WHERE id = 4000;
class id title
4000 4000 b4000
SELECT * FROM t1 WHERE title = 'a4000';
class id title
SELECT * FROM t1 WHERE title = 'b4000';
class id title
4000 4000 b4000
SELECT * FROM t1 WHERE id = 4001;
class id title
SELECT * FROM t1 WHERE title = 'a4001';
class id title
SELECT COUNT(*) FROM t1;
COUNT(*)
9992
/* Add column. */
ALTER TABLE t1 ADD COLUMN content TEXT;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT * FROM t1 WHERE id = 10;
class id title content
10 10 a10 NULL
SELECT * FROM t1 WHERE title = 'a10';
class id title content
10 10 a10 NULL
SELECT * FROM t1 WHERE id = 5000;
class id title content
5000 5000 a5000 NULL
SELECT * FROM t1 WHERE title = 'a5000';
class id title content
5000 5000 a5000 NULL
SELECT * FROM t1 WHERE id = 10000;
class id title content
10000 10000 a10000 NULL
SELECT * FROM t1 WHERE title = 'a10000';
class id title content
10000 10000 a10000 NULL
SELECT * FROM t1 WHERE id = 10010;
class id title content
SELECT * FROM t1 WHERE title = 'a10010';
class id title content
/* Drop column. */
ALTER TABLE t1 DROP COLUMN content;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT * FROM t1 WHERE id = 10;
class id title
10 10 a10
SELECT * FROM t1 WHERE title = 'a10';
class id title
10 10 a10
SELECT * FROM t1 WHERE id = 5000;
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE title = 'a5000';
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE id = 10000;
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE title = 'a10000';
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE id = 10010;
class id title
SELECT * FROM t1 WHERE title = 'a10010';
class id title
DROP TABLE t1;
CREATE TABLE t1(
a INT PRIMARY KEY,
b TEXT,
c TEXT) ENGINE=InnoDB ROW_FORMAT=COMPACT;
ALTER TABLE t1 ADD INDEX `idx` (a,b(5));
SELECT CHAR_LENGTH(b) FROM t1 WHERE a=4975;
CHAR_LENGTH(b)
10000
SELECT b=REPEAT(CONCAT('a',4975),2000) FROM t1 WHERE a=4975 AND b like 'a4975%';
b=REPEAT(CONCAT('a',4975),2000)
1
UPDATE t1 SET b = REPEAT(CONCAT('b',4975),2000) WHERE a=4975 AND b like 'a4975%';
SELECT b=REPEAT(CONCAT('a',4975),2000) FROM t1 WHERE a=4975 AND b like 'a4975%';
b=REPEAT(CONCAT('a',4975),2000)
SELECT b=REPEAT(CONCAT('b',4975),2000) FROM t1 WHERE a=4975 AND b like 'b4975%';
b=REPEAT(CONCAT('b',4975),2000)
1
DELETE FROM t1 WHERE a=4975 AND b like 'b4975%';
SELECT b=REPEAT(CONCAT('b',4975),2000) FROM t1 WHERE a=4975 AND b like 'b4975%';
b=REPEAT(CONCAT('b',4975),2000)
ALTER TABLE t1 DROP COLUMN c;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT CHAR_LENGTH(b) FROM t1 WHERE a=4975;
CHAR_LENGTH(b)
DROP TABLE t1;
DROP PROCEDURE populate_t1;
SET GLOBAL innodb_fill_factor=50;
CREATE PROCEDURE populate_t1(load_even INT)
BEGIN
DECLARE i int DEFAULT 1;
START TRANSACTION;
WHILE (i <= 10000) DO
IF i%2 = 0 AND load_even = 1 THEN
INSERT INTO t1 VALUES (i, i, CONCAT('a', i));
END IF;
IF i%2 != 0 AND load_even != 1 THEN
INSERT INTO t1 VALUES (i, i, CONCAT('a', i));
END IF;
SET i = i + 1;
END WHILE;
COMMIT;
END|
SELECT @@innodb_fill_factor;
@@innodb_fill_factor
50
CREATE TABLE t1(
class INT,
id INT,
title VARCHAR(100)
) ENGINE=InnoDB ROW_FORMAT=COMPACT;
SELECT COUNT(*) FROM t1;
COUNT(*)
5000
/* Create index. */
CREATE INDEX idx_id ON t1(id);
CREATE INDEX idx_title ON t1(title);
/* Check table. */
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
/* Select by index. */
EXPLAIN SELECT * FROM t1 WHERE id = 10;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref idx_id idx_id 5 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`class` AS `class`,`test`.`t1`.`id` AS `id`,`test`.`t1`.`title` AS `title` from `test`.`t1` where (`test`.`t1`.`id` = 10)
EXPLAIN SELECT * FROM t1 WHERE title = 'a10';
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref idx_title idx_title 103 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`class` AS `class`,`test`.`t1`.`id` AS `id`,`test`.`t1`.`title` AS `title` from `test`.`t1` where (`test`.`t1`.`title` = 'a10')
SELECT * FROM t1 WHERE id = 10;
class id title
10 10 a10
SELECT * FROM t1 WHERE title = 'a10';
class id title
10 10 a10
SELECT * FROM t1 WHERE id = 5000;
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE title = 'a5000';
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE id = 10000;
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE title = 'a10000';
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE id = 10010;
class id title
SELECT * FROM t1 WHERE title = 'a10010';
class id title
/*Insert/Update/Delete. */
DELETE FROM t1 WHERE id < 4010 AND id > 3990;
INSERT INTO t1 VALUES(4000, 4000, 'b4000');
UPDATE t1 SET title = CONCAT('b', id) WHERE id < 3010 AND id > 2990;
SELECT * FROM t1 WHERE id = 3000;
class id title
3000 3000 b3000
SELECT * FROM t1 WHERE title = 'a3000';
class id title
SELECT * FROM t1 WHERE title = 'b3000';
class id title
3000 3000 b3000
SELECT * FROM t1 WHERE id = 4000;
class id title
4000 4000 b4000
SELECT * FROM t1 WHERE title = 'a4000';
class id title
SELECT * FROM t1 WHERE title = 'b4000';
class id title
4000 4000 b4000
SELECT * FROM t1 WHERE id = 4001;
class id title
SELECT * FROM t1 WHERE title = 'a4001';
class id title
SELECT COUNT(*) FROM t1;
COUNT(*)
9992
/* Add column. */
ALTER TABLE t1 ADD COLUMN content TEXT;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT * FROM t1 WHERE id = 10;
class id title content
10 10 a10 NULL
SELECT * FROM t1 WHERE title = 'a10';
class id title content
10 10 a10 NULL
SELECT * FROM t1 WHERE id = 5000;
class id title content
5000 5000 a5000 NULL
SELECT * FROM t1 WHERE title = 'a5000';
class id title content
5000 5000 a5000 NULL
SELECT * FROM t1 WHERE id = 10000;
class id title content
10000 10000 a10000 NULL
SELECT * FROM t1 WHERE title = 'a10000';
class id title content
10000 10000 a10000 NULL
SELECT * FROM t1 WHERE id = 10010;
class id title content
SELECT * FROM t1 WHERE title = 'a10010';
class id title content
/* Drop column. */
ALTER TABLE t1 DROP COLUMN content;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT * FROM t1 WHERE id = 10;
class id title
10 10 a10
SELECT * FROM t1 WHERE title = 'a10';
class id title
10 10 a10
SELECT * FROM t1 WHERE id = 5000;
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE title = 'a5000';
class id title
5000 5000 a5000
SELECT * FROM t1 WHERE id = 10000;
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE title = 'a10000';
class id title
10000 10000 a10000
SELECT * FROM t1 WHERE id = 10010;
class id title
SELECT * FROM t1 WHERE title = 'a10010';
class id title
DROP TABLE t1;
CREATE TABLE t1(
a INT PRIMARY KEY,
b TEXT,
c TEXT) ENGINE=InnoDB ROW_FORMAT=COMPACT;
ALTER TABLE t1 ADD INDEX `idx` (a,b(5));
SELECT CHAR_LENGTH(b) FROM t1 WHERE a=4975;
CHAR_LENGTH(b)
10000
SELECT b=REPEAT(CONCAT('a',4975),2000) FROM t1 WHERE a=4975 AND b like 'a4975%';
b=REPEAT(CONCAT('a',4975),2000)
1
UPDATE t1 SET b = REPEAT(CONCAT('b',4975),2000) WHERE a=4975 AND b like 'a4975%';
SELECT b=REPEAT(CONCAT('a',4975),2000) FROM t1 WHERE a=4975 AND b like 'a4975%';
b=REPEAT(CONCAT('a',4975),2000)
SELECT b=REPEAT(CONCAT('b',4975),2000) FROM t1 WHERE a=4975 AND b like 'b4975%';
b=REPEAT(CONCAT('b',4975),2000)
1
DELETE FROM t1 WHERE a=4975 AND b like 'b4975%';
SELECT b=REPEAT(CONCAT('b',4975),2000) FROM t1 WHERE a=4975 AND b like 'b4975%';
b=REPEAT(CONCAT('b',4975),2000)
ALTER TABLE t1 DROP COLUMN c;
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
SELECT CHAR_LENGTH(b) FROM t1 WHERE a=4975;
CHAR_LENGTH(b)
DROP TABLE t1;
DROP PROCEDURE populate_t1;
SET GLOBAL innodb_fill_factor=default;