Re: Storing large strings for future equality checks

A small application that I'm making requires me to store very long
strings (>1000 characters) in a database.

I will need to use these strings later to compare for equality to
incoming strings from another application. I will also want to add some
of the incoming strings to the storage, if they meet certain criteria.

For my application, I get a feeling that storing these strings in my
table will be a waste of space, and will impact performance due to
retrieval and storage times, as well as comparison times.

I considered using an SHA-512 hash of these strings and storing them in
the database. However, while these will save on storage space, it will
take time to do the hashing before comparing an incoming string. So I'm
still wasting time. (Collisions due to hashing will not be a problem,
since an occasional false positive will not be fatal for my application).

What would be the best approach?