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I try to find the best scenario to update or insert 1 million contacts in my postgres database.

My actual scenario is:

  • read contacts 1000 per 1000 and try to insert multiple rows with one request
  • if my request fails, I go line per line to insert or update my 1000 contacts

It takes 7 minutes for 50K lines.

What is the best scenario to perform my update or insert?

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    This question is very similar to this one. – Twinkles Dec 9 '13 at 14:47
  • I used this question for my insert, my problem is when I have to update line per line – Guillaume Vincent Dec 9 '13 at 14:50
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    This related answer on SO should be of help. – Erwin Brandstetter Dec 10 '13 at 16:44
  • Is your problem ease of processing for correctness? Or performance? – Colin 't Hart Feb 7 '14 at 17:15
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    My problem was a performance problem, for now I looking for a good upsert method. Right now, I'm making an update and an insert for 1000 lines per lines. My CPU for my postgres method is around 75% CPU. – Guillaume Vincent Feb 7 '14 at 17:29
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I would do it like this:

Load all data into an empty staging table and use SQL to identify and correct problematic records before moving the data into your database.

  • This assumes the OP's problem is how to process for correctness. If the OP's problem is performance then this doesn't help at all. – Colin 't Hart Feb 7 '14 at 17:16

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