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Rows if size is measurable in GB, and file size if TB or greater
Yes, if you have more variables (Columns) per row then it will occupy more data and hence the file size will grow. It honestly depends on the use case of the data as others have mentioned, maybe it’s the norm to say the data size (in computational size) in one industry where In another the norm is to say the data size in number of rows or data points
Better to use number of transactions (e.g. 500M sales transactions)
I see. Then either approach works. “50M oil rig sensor records per day” or “30GB worth of sensor data per day”.
I'd use number of rows/transactions. File size is very dependent on many factors like data structure and fields present that could be irrelevant for your work.