You should never have to reinstall addons locally if you are pulling files/DB from production properly. If you are having this problem, the issue is most likely related to how you are doing the migration.

I'd suggest your errors are caused by your exported SQL not including DROP TABLE and you aren't manually dropping the tables in the DB before your import. 



To test my theory, delete all tables in your local DB and then do the import... Same errors?

If no errors, then you'll need to manually drop tables before importing or get your import to include the DROP TABLE syntax.

Errors when importing a MySQL database
Considering I have a website and I have millions of direct views (entering directly by URL,  not by any other URL) and that there is no links to this site anywhere else (or that this views don't generate any external link to the site), will these visits increase my positioning in search engines such as Google?

Are search engines capable of measuring direct visits rather than links from other pages?
