It looks to me like 1 bit for deleted, and 1 bit for each column to
store NULL.
1 byte for 1-7 fields.
2 bytes for 8-15 fields.
Stefan Hinz wrote:
>Keith,
>
>thanks once again! Well, anyone here from the MySQL developer team? Or
>any other guru who can explain why 10 = 11?
>
>Here's the problem once again:
>
>mysql> DESCRIBE myrowisam;
>+-------+----------+------+-----+---------+-------+
>| Field | Type | Null | Key | Default | Extra |
>+-------+----------+------+-----+---------+-------+
>| col | char(10) | YES | MUL | NULL | |
>+-------+----------+------+-----+---------+-------+
>mysql> SHOW TABLE STATUS LIKE 'myrowisam';
>+-----------+--------+------------+------+----------------+
>| Name | Type | Row_format | Rows | Avg_row_length |
>+-----------+--------+------------+------+----------------+
>| myrowisam | MyISAM | Fixed | 109 | 11 |
>+-----------+--------+------------+------+----------------+
>
>Regards,
>--
> Stefan Hinz <hinz@stripped>
> Geschäftsführer / CEO iConnect GmbH <http://iConnect.de>
> Heesestr. 6, 12169 Berlin (Germany)
> Tel: +49 30 7970948-0 Fax: +49 30 7970948-3
>
>----- Original Message -----
>From: "Keith C. Ivey" <keith@stripped>
>To: <mysql@stripped>
>Cc: "Stefan Hinz" <hinz@stripped>
>Sent: Thursday, January 16, 2003 5:05 PM
>Subject: Re: Avg_row_length
>
>
>
>
>>On 16 Jan 2003, at 0:37, Stefan Hinz wrote:
>>
>>
>>
>>>>There's a formula to calculate the row length for dynamic MyISAM
>>>>tables here:
>>>> http://www.mysql.com/doc/en/Dynamic_format.html
>>>>
>>>>
>>>Thanks for the hint, but this doesn't explain fixed length row
>>>calculations where char(10) will give an average row length of 11
>>>(bytes), or does it?
>>>
>>>
>>You're right, it doesn't. I forgot that you were talking about fixed-
>>length records. I'm afraid I don't have anything else to add then,
>>since I know nothing about the storage format other than what I've
>>seen in the documentation.
>>
>>[Filter fodder: SQL]
>>
>>--
>>Keith C. Ivey <keith@stripped>
>>Tobacco Documents Online
>>http://tobaccodocuments.org
>>Phone 202-667-6653
>>
>>
>
>
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