问题 I am relatively new in the "large data process" in r here, hope to look for some advise about how to deal with 50 GB csv file. The current problem is following: Table is looked like: ID,Address,City,States,... (50 more fields of characteristics of a house) 1,1,1st street,Chicago,IL,... # the first 1 is caused by write.csv, they created an index raw in the file I would like to find all rows that is belonging San Francisco, CA. It supposed to be an easy problem, but the csv is too large. I know