Forum SQL - database error

[محروم.كوم]

Hi,
if anyone can hint me what kind of question is sql?

Code:
SELECT thread.threadid, thread.title, thread.prefixid, post.attach, thread.postusername, thread.dateline, podcastitem.*, forum.forumid, post.pagetext AS message, post.allowsmilie, post.postid FROM forum_thread AS thread INNER JOIN forum_forum AS forum ON(forum.forumid = thread.forumid) LEFT JOIN forum_post AS post ON (post.postid = thread.firstpostid) LEFT JOIN forum_podcastitem AS podcastitem ON (podcastitem.postid = thread.firstpostid) WHERE 1=1 AND thread.forumid IN(1,2,18,68,70,69,74,72,73,24,71,23,27,38,42,31,6 2,78,52,63,53,54,55,61,79,60,65,58,59,64,50,56,57, 43,4,29,5,30,6,21,22,26,28,39,51,7,47,48,8,9,11,3, 35,36,37,32,33,40,19,75,34,76,25,44,41,45) AND thread.visible = 1 AND post.visible = 1 AND open 10 AND thread.dateline > -24646346544 ORDER BY thread.dateline DESC LIMIT 15:
Such queries to the database are hundreds and they cause overloading the database - which leads to a Database error message. I do not know where to find the cause - unfortunately I do not know why/where this query is generated? Scheduled tasks? search? - Any tips please ... __DEFINE_LIKE_SHARE__