如何从文件中导入大量数据到应用程序中的sqlite(实时)

I have a big list of words (over 2 millions) in CSV file (size about 35MB). I wanted to import the CSV file into sqlite3 with index (primiary key). So I've imported it using sqlite command line tool. The DB has been created and size of the .sqlite file has grown to over 120MB! (50% because of primary key index)I have a big list of words (over 2 millions) in