With phpmyadmin it is actually pretty simple:
FIRST: make a backup of your database.
The go into phpmyadmin, select your wordpress database, and click the sql tab, and enter the following query:
SELECT *FROM wp_comments WHERE comment_approved =”0″
that should select all 282125 records. If you get that number, then do the following query:
delete from wp_comments WHERE comment_approved =”0″
That should delete all pending comments.
You may want to run a repair on your db files after that big delete, just in case. You can do this by using phpmyadmin, select the table with overhead bytes then repair it.
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To close all comments for all articles in sql use statement : UPDATE *wp_posts SET comment_status=”closed”