Assumption: this data you are de-duping is downloaded fresh, daily from TwitFace.

The idea of loading 180 million records into a db on disk in order to de-dup it is ridiculous if you are in any way concerned with speed.

The following shows a 10-line perl script de-duping a 200-million line, 2.8 GB file of 12-digit numbers in a little over 2 1/2 minutes, using less than 30 MB of ram to do so:

C:\test>dir 1054929.dat
20/09/2013  04:22     2,800,000,000 1054929.dat

C:\test>wc -l 1054929.dat
200000000 1054929.dat

C:\test>head 1054929.dat
100112321443
100135127486
100110839892
100098464584
100098900542
100048844759
100090430059
100018238859
100132791659
100027638968

C:\test>1054929 1054929.dat | wc -l
1379647642.87527
1379647855.6311
113526721

[download]

That's processing the 12-digit numbers at a rate of just under 1 million per second.

You cannot even load the data into the DB at 1/100th of that rate; never mind get the de-duped back out.

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: DBI::SQLite slowness by BrowserUk
in thread DBI::SQLite slowness by Endless

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