Keith, > 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? Regards, -- Stefan Hinz <[EMAIL PROTECTED]> 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" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Cc: "Stefan Hinz" <[EMAIL PROTECTED]> Sent: Wednesday, January 15, 2003 4:39 PM Subject: Re: Avg_row_length > On 15 Jan 2003, at 13:03, Stefan Hinz wrote: > > > > I believe there is an extra byte for the 'null' flag; if you declare > > > this column to be NOT NULL, I'll bet the avg length will be 10. > > > > nice bet, but you lose <g>: > > In addition to the bitmap for which columns have null values (if > there are any columns that can be null), there's a similar bitmap to > show which columns have zero values (or the empty string, for string > columns). That normally saves space because no additional storage is > used if the column is zero. > > There's a formula to calculate the row length for dynamic MyISAM > tables here: > > http://www.mysql.com/doc/en/Dynamic_format.html > > -- > Keith C. Ivey <[EMAIL PROTECTED]> > Tobacco Documents Online > http://tobaccodocuments.org > Phone 202-667-6653 --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
