https://discourse.devontechnologies.com/t/how-many-records-fit-into-a-database/52192/3
For my mac with 8G of RAM, 200,000,000 words seems like an appropriate limit for a database.
Because I have a large number of books PDF, reaching this amount seems to be a predictable thing 
Maybe the best way to solve it is to upgrade my Mac？Or do you have a better suggestion? 