Sorry I still don't get it. A database that actually used all 64GB of MEMORY--not disk--would store billions of customer records, and yet this is a small business? What small business stores billions of records of anything?
Yes I have seen many extremely poorly designed schemas that did take up huge amounts of memory, but that is easily corrected before launch. Don't store everything as a string, that's one way. But there are more reasons such a schema needs to be fixed, other than the $ cost of memory.
These days, it's fairly common to store larger fields or even files in the database. SQL Server's FileTable and FileStream fields are designed for that exact use.
Plus, remember that one server can be used for multiple databases. In SQL Server, it's fairly common to see a single server housing the accounting software, the payroll software, the email auditing back end, VMware Virtual Center's databases, etc.
How do you figure you could store "billions" of customer records in a 64GB memory space? That's 68 billion bytes, and you lose a very significant portion of it to things that aren't base table storage. Never mind cached query plans.... how about indexes? If you consider a table containing a customer name, address, telephone number, and a couple of other basic pieces, you could be looking at a few kb for each record. That'll get you closer to a total potential storage of 20m records. Not billions.
Oh, and I have seen small businesses running SQL Standard with databases exceeding 500GB and individual tables with over 1.5 billion rows -- and the tables were designed efficiently! They couldn't afford Enterprise because of the tight profit margin nature of their line of work. What I'm saying is, don't discount the data needs of small business.
Telecom. We store tight, tiny columns. We've got 100s of GB of data. Many records are transactions that earned us nothing (call didn't connect, yet tried several attempts). We're not a large business by any measure.
Even smaller companies in other fields might want to store tons of rows. User action data, for instance. Living in the past and insisting 64GB of MEMORY is somehow huge is just being silly.
Yes I have seen many extremely poorly designed schemas that did take up huge amounts of memory, but that is easily corrected before launch. Don't store everything as a string, that's one way. But there are more reasons such a schema needs to be fixed, other than the $ cost of memory.