[D] What databases would you use for large amounts of csv data?

What databases for quick query and storage on large datasets?

I have a 5 million row csv file that is about 1 gb of text. I also have 4 other csv files about the same size that I need to eventually combine together. However, the csv files I read into pandas are slow to read in and process. What are some database options that you would use for machine learning projects on this dataset?

I basically have 20 million rows …

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