Wordpress error_log - What does it mean

Can someone please tell me what this means and how to fix it (it repeats many times a day)
Thanks!

[05-Feb-2012 23:00:23] WordPress database error Duplicate column name 'is_featured' for query ALTER TABLE wp_price ADD `is_featured` TINYINT( 4 ) NOT NULL DEFAULT '0' made by require, require_once, require_once, require_once, include
[05-Feb-2012 23:00:23] WordPress database error Duplicate column name 'title_desc' for query ALTER TABLE wp_price ADD `title_desc` TEXT NOT NULL made by require, require_once, require_once, require_once, include
[05-Feb-2012 23:00:23] WordPress database error Duplicate column name 'cat' for query ALTER TABLE wp_price ADD `cat` varchar( 255 ) NOT NULL made by require, require_once, require_once, require_once, include
[05-Feb-2012 23:02:24] WordPress database error Duplicate column name 'is_featured' for query ALTER TABLE wp_price ADD `is_featured` TINYINT( 4 ) NOT NULL DEFAULT '0' made by require, require_once, require_once, require_once, include
[05-Feb-2012 23:02:24] WordPress database error Duplicate column name 'title_desc' for query ALTER TABLE wp_price ADD `title_desc` TEXT NOT NULL made by require, require_once, require_once, require_once, include
[05-Feb-2012 23:02:24] WordPress database error Duplicate column name 'cat' for query ALTER TABLE wp_price ADD `cat` varchar( 255 ) NOT NULL made by require, require_once, require_once, require_once, include

 

i think u data base mysql going down sometimes

 

Looks like it's coming from some kind of shopping cart or members plugin.

 

Have you already run table optimize and repair?