wordpress DB connection error

[skyxing]

Hello @[skyxing],

You can be running out of RAM making MySQL crash and causing the DB Connection Error.

What are your VPS Specs?

Please post more information regarding your MySQL, verify if the MySQL Server is not crashing and post the crash logs if it is crashing.

Regarding WordPress, if your theme is requesting 256mb of memory... it can be easily the cause of running out of RAM (you say you have more WP sites).

Also, check this thread: http://forums.sentora.org/showthread.php...ight=mysql

Thank you for your kind reply,
May I receive your another kindness?

I checked my resources by htop(knew owing to another kind guide) as follows. 



Also it seems my VPS(2CPU, 1GB ram) has no swap memory. is it right? or good?
sorry I am also a novice in Server Management...

I think... I have a problem(my web sites are very slow after installing more than 8 wordpress sites in one VPS(1GB ram)... 

And i don't know wy there are so many mySQLs over than the number of wordpress sites...