Maximilian Atlantis

That would mean nothing is wrong that you can improve. You would need to upgrade your hosting if you are running into size limits.

Or you need to start deleting a bunch of content. Personally I would switch to a different hosting provider that provides such restrictive database limits.  Thats an artificial limit designed to make you upgrade to a higher package IMO. 

Also, considering the database's size, I would never recommend doing the "optimization" from phpMyAdmin. I'd rather do it from SSH to avoid timeouts.
As opentype already mentioned, it's probably time to change hosting. Your site is not a good fit for that limit.

Even if you were able to optimize the data in one way or another, you are only pushing the problem away some months into the future, when the space is used up again. A 2GB limit is just too small for a successful Invision Community installation. 

Here is the provider answer
This is an update about your database issue.
B quota showing in our system is accurate based on the quota checked in the MySQL server. PHPMyAdmin delivers wrong values for database size if used with innodb tables. PHPMyAdmin ignores data_free for innodb tables, even though innodb is the only storage engine which delivers realistic values for this value . The phpmyadmin developers consider that everybody uses innodb with file_per_table = 0 . If this would be the case all innodb files would be located within the ibdata1 file and no space could be reclaimed. In this case it would kind of make sense to report 0 as value for data_free. To fix this issue, database table needs to be optimize. 

And you check through phpMyAdmin which of the tables in your database actually has a large size.
There is such a column - size, in the list of tables, just scroll and you will find which table has a strangely large size. This will direct help reasoning to you in the direction of solving the issue

A database backup size may also be added if your hosting account creates one

Unfortunately this is a question for your hosting provider. IPS can’t control what they report or how they report it. 

It’s possible the database needs optimized or repaired, but again that’s something they would have to assist with. 

Also… if they can’t figure it out… IPS cloud offerings don’t have those restrictions. There is no database limits or even limits on page views anymore. 

That’s an issue with a 3rd party app! Disable all your 3rd party apps and plugins to resolve the issue. Then make sure that you have the recent version installed

Glad to hear your issue is resolved.