This script can generate dummy CSV file.

generate-dummy-csv.sh

#!/bin/bash
echo `date`" start"

for i in `seq 0 7000000`
do
	year=$((RANDOM%8+2012))
	month=$((RANDOM%12+1))
	day=$((RANDOM%29+1))
	hour=$((RANDOM%24))
	min=$((RANDOM%60))
	sec=$((RANDOM%60))
	ms=$((RANDOM%1000))
	date="$(printf "%04d" ${year})-$(printf "%02d" ${month})-$(printf "%02d" ${day}) $(printf "%02d" ${hour}):$(printf "%02d" ${min}):$(printf "%02d" ${sec}).$(printf "%03d" ${ms})"
  	echo "$i,$date,dummy" >> ./temp.txt
done

echo `date`" end"