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Editorial Team
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Asked: 2026-05-30T02:29:34+00:00

Using PostgreSQL (8.x), I need to skip a block of sequence numbers automatically ,

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Using PostgreSQL (8.x), I need to skip a block of sequence numbers automatically, e.g. after giving out 49999 I want the next id to be 70000 not 50000

What is the correct/safest way of doing this?

NB: I originally posted a very similar question How can I forward a primary key sequence in Django safely? but I have the feeling that this must be done at database level (concurrency issues)…

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1 Answer

  1. Editorial Team

    I believe I’ve found a way:

    • Don’t use SERIAL for the primary key, use DEFAULT my_next_id()
    • Follow the same logic as for “single level gapless sequence” – http://www.varlena.com/GeneralBits/130.php – my_next_id() does an update followed by a select
    • Instead of just increasing by 1, check if a boundary was crossed and if so, increase even further
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