Please stop posting the same error over and over again - WE GET THE POINT. Furthermore, please read replies posted.

im very sorry bout this sir,but i dont know what should i do to make my forum normal again.
until now my host support never solved my problem.im stressfull about this.

It sounds like your host is offering a lot of help, but the problem appears to be in your software. Maybe a corrupt modification.

You can try disabling all your mods and adding them back one by one.

But, like Dismounted just said, there's no point in asking for help here if you're going to ignore the replies. You've been given three suggestions now and you need to try all of them and report back.

If you're not familiar with vbulletin I believe paid help is available somewhere around here.

okay no problem,i can pay for this but it must make my vbulletin normal again and not have an issue like this.
but my support host say i must upgrade the RAM.
before this my ram is 2GB.i take dedicated server.

--------------- Added [DATE]1214028670[/DATE] at [TIME]1214028670[/TIME] ---------------

in my plugin/product i just install simple mod :
Cyb - Advanced Forum Statistics
Cyb - Login To User Account
elmati - ADS inside postbit
Enhanced Image Captcha
Force Users to Read a Thread : Disable
Full Quick Reply
Invitation System
Members Who Registered Today
nCode Image Resizer
Personal Notepad
Post Thank You Hack
Quick Register
Tag Cloud - Forum Home
Usergroup Legend - J2Gaming.com
vB Ad Management
vB Ad Management English language
vB.Sponsors
vbBux / vbPlaza : Disable
vBCode table
Watermark Attachments
Welcome Headers

Again, please read replies and run the top command.

okay,my support say :

Please post my.cnf from /etc.

Okay this is my.cnf :

[mysqld]
max_connections = 650
safe-show-database
skip-locking
key_buffer = 128M
max_allowed_packet = 1M
table_cache = 256
sort_buffer_size = 2M
read_buffer_size = 2M
read_rnd_buffer_size = 2M
myisam_sort_buffer_size = 64M
thread_cache_size = 8
query_cache_size= 64M
thread_concurrency = 8
wait_timeout = 30

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash

[isamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

[myisamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

log-slow-queries = /var/log/mysql-slow.log
long_query_time = 3

Try increasing max_connections.

how i can set for max_connection?
do u have suggestion sir?

--------------- Added [DATE]1214151094[/DATE] at [TIME]1214151094[/TIME] ---------------

btw my support say :

now im using dedicated server for 2GB ram.
but my host told me to upgrade my ram in to 4GB ram.
but the problem is that my members was online each day it is just for 5k uniq visitors.
is 2gb is not enough?