Domain change

Hello

I moved a site from a hosting company to another and the domain name also changed. Some things were still redirecting to the old site when I moved it, so I looked in the database and there were several records and settings (especially cache records) that had the old domain hard coded in the database. I did a find and replace and then I was no longer able to log as admin. I had to unistall and reinstall again, but I still have the problem.

a) What is the best way to globally change all settings of the plugin in the database so that they are domain independent or the new domain can be replaced.

b) Can the cache be disabled and how?

Thanks!