Forum Masses of Database Errors with 4.0.3

[محروم.كوم]

For some reason I have started getting masses of database errors, often within minutes of each other. I would appreciate any help you may have. Many thanks.

Type 1:

Code:
mysql_connect() [function.mysql-connect]: Can't connect to MySQL server on 'mysql01.myhostcp.com' (4)
/var/www/vhosts/MYDOMAIN.com/httpdocs/forums/includes/class_core.php on line 312
Type 2:

Code:

Invalid SQL:

SELECT post.dateline, post.pagetext AS message, post.allowsmilie, post.postid,
thread.threadid, thread.title, thread.prefixid, post.attach,
forum.forumid,
user.*
,avatar.avatarpath, NOT ISNULL(customavatar.userid) AS hascustomavatar, customavatar.dateline AS avatardateline,customavatar.width AS avwidth,customavatar.height AS avheight
FROM vb_post AS post
JOIN vb_thread AS thread ON (thread.threadid = post.threadid)

JOIN vb_forum AS forum ON(forum.forumid = thread.forumid)
LEFT JOIN vb_user AS user ON (post.userid = user.userid)
LEFT JOIN vb_avatar AS avatar ON(avatar.avatarid = user.avatarid) LEFT JOIN vb_customavatar AS customavatar ON(customavatar.userid = user.userid)
WHERE 1=1
AND thread.forumid IN(5)
AND thread.visible = 1
AND post.visible = 1
AND thread.open 10
AND post.dateline > 1268810660


ORDER BY post.dateline DESC
LIMIT 0,5;

MySQL Error : Can't create/write to file '/tmp/#sql_742e_0.MYD' (Errcode: 24)
Error Number : 1 __DEFINE_LIKE_SHARE__