Memory usage issue in WordPress 3.x

I had a similar issue on my WP site, I think it was actually a plugin causing a problem, quite possibly a caching one…

Couple of questions:

What is it you are trying to do when the error appears?

What plugins do you have active?

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)