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Row size
Posted by: Steve Fink
Date: June 16, 2009 06:55PM

I have a table containing 3 integer columns, and it seems too large -- according to show table status, it averages 74 bytes per row. I would expect 18 (6 bytes for overhead, plus 4 each for the 3 columns.)

The same table using the MyISAM engine is exactly 13 bytes per row, so my calculations aren't completely crazy.

mysql> show table status like 'raw_log' \G
*************************** 1. row ***************************
Name: raw_log
Engine: InnoDB
Version: 10
Row_format: Compact
Rows: 179204703
Avg_row_length: 74
Data_length: 13413384192
Max_data_length: 0
Index_length: 3901751296
Data_free: 0
Auto_increment: NULL
Create_time: 2009-06-12 16:01:37
Update_time: NULL
Check_time: NULL
Collation: latin1_swedish_ci
Checksum: NULL
Create_options:
Comment: InnoDB free: 5120 kB; (`field_id`) REFER `adlog/fields`(`id`)

mysql> show create table raw_log \G
*************************** 1. row ***************************
Table: raw_log
Create Table: CREATE TABLE `raw_log` (
`field_id` int(4) NOT NULL,
`field_value_id` int(11) NOT NULL,
`line_id` int(11) NOT NULL,
PRIMARY KEY (`line_id`,`field_id`),
KEY `field_id` (`field_id`),
CONSTRAINT `raw_log_ibfk_2` FOREIGN KEY (`field_id`) REFERENCES `fields` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1

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