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START TRANSACTION
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DROP DATABASE IF EXISTS `base`
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CREATE DATABASE IF NOT EXISTS `base`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
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DROP TABLE IF EXISTS `t1sensor`
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CREATE TABLE `t1sensor`
( `SensorID` TINYINT UNSIGNED NOT NULL,
`DateTime` DATETIME NOT NULL,
`Value` FLOAT NOT NULL,
PRIMARY KEY(`SensorID`,`DateTime`),
index `idx1` (`DateTime`)
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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INSERT INTO `t1sensor` (`DateTime`,`SensorID`,`Value`) values
('2023-01-01 00:00:01', 1, 17.2),('2023-01-01 00:00:02', 2, 15.5),('2023-01-01 00:00:03', 2, 34.7),('2023-01-01 00:00:05', 2, 38.2)
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select * from `t1sensor`
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+----------+---------------------+-------+
| SensorID | DateTime | Value |
+----------+---------------------+-------+
| 1 | 2023-01-01 00:00:01 | 17.2 |
| 2 | 2023-01-01 00:00:02 | 15.5 |
| 2 | 2023-01-01 00:00:03 | 34.7 |
| 2 | 2023-01-01 00:00:05 | 38.2 |
+----------+---------------------+-------+
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DROP TABLE IF EXISTS `t2sensor`
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CREATE TABLE `t2sensor`
( `SensorID` SMALLINT UNSIGNED NOT NULL,
`DateTime` DATETIME NOT NULL,
`Value` FLOAT NOT NULL,
PRIMARY KEY(`SensorID`,`DateTime`),
index `idx2` (`DateTime`)
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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INSERT INTO `t2sensor` (`DateTime`,`SensorID`,`Value`) values
('2023-01-01 00:00:01', 1, 17.2),('2023-01-01 00:00:02', 2, 15.5),('2023-01-01 00:00:03', 2, 34.7),('2023-01-01 00:00:05', 2, 38.2)
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select * from `t2sensor`
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+----------+---------------------+-------+
| SensorID | DateTime | Value |
+----------+---------------------+-------+
| 1 | 2023-01-01 00:00:01 | 17.2 |
| 2 | 2023-01-01 00:00:02 | 15.5 |
| 2 | 2023-01-01 00:00:03 | 34.7 |
| 2 | 2023-01-01 00:00:05 | 38.2 |
+----------+---------------------+-------+
--------------
select table_name AS `table`,
ROUND(((DATA_LENGTH ) / 1024), 2) AS `Data Size (KB)`,
ROUND(((INDEX_LENGTH ) / 1024), 2) AS `Index Size (KB)`,
ROUND(((DATA_LENGTH + INDEX_LENGTH) / 1024), 2) AS `Total Size (KB)`
from information_schema.tables
where TABLE_SCHEMA = 'base'
order by (DATA_LENGTH + INDEX_LENGTH) desc
--------------
+----------+----------------+-----------------+-----------------+
| table | Data Size (KB) | Index Size (KB) | Total Size (KB) |
+----------+----------------+-----------------+-----------------+
| t1sensor | 8.00 | 8.00 | 16.00 |
| t2sensor | 8.00 | 8.00 | 16.00 |
+----------+----------------+-----------------+-----------------+
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explain select * from t1sensor where `SensorID` = 2
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+----+-------------+----------+------------+------+---------------+---------+---------+-------+------+----------+-------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+----------+------------+------+---------------+---------+---------+-------+------+----------+-------+
| 1 | SIMPLE | t1sensor | NULL | ref | PRIMARY | PRIMARY | 1 | const | 3 | 100.00 | NULL |
+----+-------------+----------+------------+------+---------------+---------+---------+-------+------+----------+-------+
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explain select * from t2sensor where `SensorID` = 2
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+----+-------------+----------+------------+------+---------------+---------+---------+-------+------+----------+-------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+----------+------------+------+---------------+---------+---------+-------+------+----------+-------+
| 1 | SIMPLE | t2sensor | NULL | ref | PRIMARY | PRIMARY | 2 | const | 3 | 100.00 | NULL |
+----+-------------+----------+------------+------+---------------+---------+---------+-------+------+----------+-------+
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explain select * from t1sensor where `DateTime` between'2023-01-01 00:00:00' and '2023-01-01 23:59:59'
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+----+-------------+----------+------------+-------+---------------+------+---------+------+------+----------+-----------------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+----------+------------+-------+---------------+------+---------+------+------+----------+-----------------------+
| 1 | SIMPLE | t1sensor | NULL | range | idx1 | idx1 | 5 | NULL | 4 | 100.00 | Using index condition |
+----+-------------+----------+------------+-------+---------------+------+---------+------+------+----------+-----------------------+
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explain select * from t2sensor where `DateTime` between'2023-01-01 00:00:00' and '2023-01-01 23:59:59'
--------------
+----+-------------+----------+------------+-------+---------------+------+---------+------+------+----------+-----------------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+----------+------------+-------+---------------+------+---------+------+------+----------+-----------------------+
| 1 | SIMPLE | t2sensor | NULL | range | idx2 | idx2 | 5 | NULL | 4 | 100.00 | Using index condition |
+----+-------------+----------+------------+-------+---------------+------+---------+------+------+----------+-----------------------+
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explain select * from t1sensor where `DateTime` = '2023-01-01 00:00:02'
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+----+-------------+----------+------------+------+---------------+------+---------+-------+------+----------+-------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+----------+------------+------+---------------+------+---------+-------+------+----------+-------+
| 1 | SIMPLE | t1sensor | NULL | ref | idx1 | idx1 | 5 | const | 1 | 100.00 | NULL |
+----+-------------+----------+------------+------+---------------+------+---------+-------+------+----------+-------+
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explain select * from t2sensor where `DateTime` = '2023-01-01 00:00:02'
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+----+-------------+----------+------------+------+---------------+------+---------+-------+------+----------+-------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+----------+------------+------+---------------+------+---------+-------+------+----------+-------+
| 1 | SIMPLE | t2sensor | NULL | ref | idx2 | idx2 | 5 | const | 1 | 100.00 | NULL |
+----+-------------+----------+------------+------+---------------+------+---------+-------+------+----------+-------+
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COMMIT
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