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140 lines
3.5 KiB
Plaintext
140 lines
3.5 KiB
Plaintext
CREATE PROCEDURE populate_t1()
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BEGIN
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DECLARE i int DEFAULT 1;
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START TRANSACTION;
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WHILE (i <= 1000) DO
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INSERT INTO t1 VALUES (i, i, CONCAT('a', i));
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SET i = i + 1;
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END WHILE;
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COMMIT;
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END|
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SELECT @@innodb_fill_factor;
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@@innodb_fill_factor
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100
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CREATE TABLE t1(
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class INT,
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id INT,
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title VARCHAR(100)
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) ENGINE=InnoDB ROW_FORMAT=COMPACT;
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SELECT COUNT(*) FROM t1;
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COUNT(*)
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1000
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/* Create index. */
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CREATE INDEX idx_id ON t1(id);
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CREATE INDEX idx_title ON t1(title);
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/* Check table. */
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CHECK TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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/* Select by index. */
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EXPLAIN SELECT * FROM t1 WHERE id = 10;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref idx_id idx_id 5 const 1
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EXPLAIN SELECT * FROM t1 WHERE title = 'a10';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref idx_title idx_title 103 const 1 Using index condition
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SELECT * FROM t1 WHERE id = 10;
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class id title
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10 10 a10
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SELECT * FROM t1 WHERE title = 'a10';
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class id title
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10 10 a10
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SELECT * FROM t1 WHERE id = 500;
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class id title
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500 500 a500
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SELECT * FROM t1 WHERE title = 'a500';
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class id title
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500 500 a500
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SELECT * FROM t1 WHERE id = 1000;
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class id title
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1000 1000 a1000
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SELECT * FROM t1 WHERE title = 'a1000';
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class id title
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1000 1000 a1000
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SELECT * FROM t1 WHERE id = 1010;
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class id title
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SELECT * FROM t1 WHERE title = 'a1010';
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class id title
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DROP TABLE t1;
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CREATE TABLE t1(
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a INT PRIMARY KEY,
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b TEXT,
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c TEXT) ENGINE=InnoDB ROW_FORMAT=COMPACT;
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INSERT INTO t1 VALUES
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(1, REPEAT('a',10000), 'a'),
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(2, REPEAT('b',20000), 'b'),
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(3, REPEAT('c',40000), 'c'),
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(4, REPEAT('d',60000), 'd');
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ALTER TABLE t1 DROP COLUMN c;
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CHECK TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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SELECT CHAR_LENGTH(b) FROM t1 WHERE a=4975;
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CHAR_LENGTH(b)
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DROP TABLE t1;
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SET GLOBAL innodb_file_per_table=default;
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SET GLOBAL innodb_file_per_table=1;
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CREATE TABLE t1(
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class INT,
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id INT,
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title VARCHAR(100)
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) ENGINE=InnoDB ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=4;
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SELECT COUNT(*) FROM t1;
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COUNT(*)
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1000
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/* Create index. */
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CREATE INDEX idx_id ON t1(id);
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CREATE INDEX idx_title ON t1(title);
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/* Check table. */
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CHECK TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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/* Select by index. */
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EXPLAIN SELECT * FROM t1 WHERE id = 10;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref idx_id idx_id 5 const 1
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EXPLAIN SELECT * FROM t1 WHERE title = 'a10';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref idx_title idx_title 103 const 1 Using index condition
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SELECT * FROM t1 WHERE id = 10;
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class id title
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10 10 a10
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SELECT * FROM t1 WHERE title = 'a10';
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class id title
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10 10 a10
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SELECT * FROM t1 WHERE id = 500;
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class id title
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500 500 a500
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SELECT * FROM t1 WHERE title = 'a500';
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class id title
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500 500 a500
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SELECT * FROM t1 WHERE id = 1000;
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class id title
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1000 1000 a1000
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SELECT * FROM t1 WHERE title = 'a1000';
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class id title
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1000 1000 a1000
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SELECT * FROM t1 WHERE id = 1010;
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class id title
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SELECT * FROM t1 WHERE title = 'a1010';
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class id title
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DROP TABLE t1;
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CREATE TABLE t1(
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a INT PRIMARY KEY,
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b TEXT,
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c TEXT) ENGINE=InnoDB ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=4;
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INSERT INTO t1 VALUES
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(1, REPEAT('a',10000), 'a'),
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(2, REPEAT('b',20000), 'b'),
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(3, REPEAT('c',40000), 'c'),
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(4, REPEAT('d',60000), 'd');
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ALTER TABLE t1 DROP COLUMN c;
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CHECK TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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SELECT CHAR_LENGTH(b) FROM t1 WHERE a=4975;
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CHAR_LENGTH(b)
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DROP TABLE t1;
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SET GLOBAL innodb_file_per_table=default;
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DROP PROCEDURE populate_t1;
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