It took 60 seconds to pass 10M (M=million) records.

Hm. 10e6 in a minute suggests a total time for 1e9 of well under 2 hours.

This post mentions a time of 5 hours. What changed?

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^5: selecting columns from a tab-separated-values file by BrowserUk
in thread selecting columns from a tab-separated-values file by ibm1620

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