Problems with large number of posts (Wordpress)

I have a Wordpress Blog with ~ 6K posts. In the past when I used a shared hosting, my hosting company said that I used too many CPU. They asked me optimized and indexed my database. I bought a clound hosting (512 MB memory) since few days.but some time when I connect to my blog, there is a error 'Error establishing a database connection", and I must restart mySQL. Did someone have the same issue ? Please help. Thank you

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Another option would be to optimize the my.cnf file so it uses less RAM, possibly limiting maximum concurrent connections and increasing some cache values.

thank you all !

It depends on the site’s load really. Try scaling up to 1GB and load-testing the website (I personally recommend to see if that’s enough. You should also optimize the my.cnf file as sb73542 mentioned.