SQL server overload

Hello!!

I have a problem with WordPress since two or three months ago. I’ve also seen is an usual problem, but I couldn’t find how to fix it.

I have a SQL server overload. When I enter in my site, I receive the next message: Error establishing a database connection. If I try to enter in myPHPadmin, I have problems to connect, when I’m lucky and I can write query: ‘show full processlist’, I see there are a big queue of queries.

For example :
Id User Host db Command Time State Info
16 dbo********* localhost db********* Query 24 Waiting for table SELECT ?wp_posts.* FROM wp_posts ?WHERE 1=1 ?AND w…
17 dbo********* localhost db********* Query 24 Waiting for table SELECT ?wp_posts.* FROM wp_posts ?WHERE 1=1 ?AND w…
18 dbo********* localhost db********* Query 24 Waiting for table SELECT ?wp_posts.* FROM wp_posts ?WHERE 1=1 ?AND w…
19 dbo********* localhost db********* Query 24 Waiting for table SELECT post_modified_gmt FROM wp_posts WHERE post_…
20 dbo********* localhost db********* Query 24 Waiting for table SELECT ?wp_posts.* FROM wp_posts ?WHERE 1=1 ?AND w…
23 dbo********* localhost db********* *0513*** Query 24 Waiting for table SELECT ?wp_posts.* FROM wp_posts ?WHERE 1=1 ?AND w…
26 dbo********* localhost db********* Query 24 Waiting for table SELECT ?wp_posts.* FROM wp_posts ?WHERE 1=1 ?AND w…
27 dbo********* localhost db********* Query 24 Waiting for table SELECT post_modified_gmt FROM wp_posts WHERE post_…
28 dbo********* localhost db********* Query 24 Waiting for table SELECT ?wp_posts.* FROM wp_posts ?WHERE 1=1 ?AND Y…
29 dbo********* localhost db********* Query 23 Waiting for table SELECT ?wp_posts.* FROM wp_posts ?WHERE 1=1 ?AND Y…

I’ve read that problem is due to a low memory of my hosting. I’ve contacted him (1and1), and they said they can’t do anything. I have a dedicated server, so it has no sense.

I’ve tried deactivating plugins, but it didn’t work.

What can I do?

I hope u can help me.

Thanks you very much.