mysql - Disk space difference about text and varchar -


this question has answer here:

there disk space difference these 2 fields: text , varchar ?

i need use field store url hosting support varchar 333 chars.

here table:

  create table if not exists `urls` (   `id` int unsigned not null auto_increment,   `n_id` int unsigned not null default '0',   `first_citizen_id` int unsigned not null default '0',   `title_citizen` varchar(128) not null,   `title_source` varchar(255) not null,   `link` varchar(333) not null default '',   `link_image` varchar(333) not null default '',   `created` timestamp not null default current_timestamp,   primary key (`id`),   unique key `link` (`link`) ) engine=myisam default charset=utf8 auto_increment=1 ;

from data type storage requirements chapter:

in following table, m represents declared column length in characters nonbinary string types , bytes binary string types. l represents actual length in bytes of given string value.

varchar(m), varbinary(m) l + 1 bytes if column values require 0 – 255 bytes, l + 2 bytes if values may require more 255 bytes

blob, text l + 2 bytes, l < 216

whatever, i'm pretty sure hosting service not limiting anything. have table lots of large columns , hit maximum row size.


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