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RhodiumToad's profile
RhodiumToad
RhodiumToad
RhodiumToad
@RhodiumToad

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RhodiumToad

@RhodiumToad

Find me on IRC: #postgresql or #freebsd on http://freenode.net . (he/him)

Joined February 2019

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    1. Lætitia‏ @l_avrot 19 Sep 2019
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      Lætitia Retweeted Lukas Eder

      Please #PostgreSQL hackers, we'd like to understand the significant performance difference between count(*) and count(1).https://twitter.com/lukaseder/status/1174621016187973632 …

      Lætitia added,

      Lukas Eder @lukaseder
      Replying to @l_avrot @pg_xocolatl and 6 others
      Well, I'd love to hear why it's so significant. Am I doing something substantially wrong in my benchmark? Can you folks reproduce it? Code here: https://gist.github.com/lukaseder/2611212b23ba40d5f828c69b79214a0e …
      1 reply 2 retweets 4 likes
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    2. Lukas Eder‏ @lukaseder 19 Sep 2019
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      Replying to @l_avrot

      Could you reproduce it?

      1 reply 0 retweets 0 likes
    3. Lætitia‏ @l_avrot 19 Sep 2019
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      Replying to @lukaseder

      Hi Lukas, I'm running a Postgres 13 on MacOS (without any tuning) and wasn't able to reproduce it. It seems statement 1 performs slightly better, but the difference is so tiny, it could be just luck... @pg_xocolatl @RhodiumToad : What do you think ?pic.twitter.com/KWFAOTxPsV

      2 replies 0 retweets 1 like
    4. Lukas Eder‏ @lukaseder 19 Sep 2019
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      Replying to @l_avrot @pg_xocolatl @RhodiumToad

      Very interesting. That looks like the result I would have expected: The differences are negligible / irrelevant.

      1 reply 0 retweets 1 like
    5. Daniel Westermann‏ @westermanndanie 19 Sep 2019
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      Replying to @lukaseder @l_avrot and

      https://www.postgresql.org/message-id/flat/df354b76-a645-73fc-9645-4508e5291d71%40gmx.net …

      2 replies 0 retweets 0 likes
    6. Lukas Eder‏ @lukaseder 19 Sep 2019
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      Replying to @westermanndanie @l_avrot and

      Does it help if we say MySQL got this right? 😜pic.twitter.com/SJI40eBI1Z

      1 reply 0 retweets 0 likes
    7. Daniel Westermann‏ @westermanndanie 19 Sep 2019
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      Replying to @lukaseder @l_avrot and

      Just out of interest: Why does the test case use PL/pgSQL instead of plain SQL? I can not see any big difference in plain SQL

      1 reply 0 retweets 0 likes
    8. Lukas Eder‏ @lukaseder 19 Sep 2019
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      Replying to @westermanndanie @l_avrot and

      How would you run the statement 5x100x with plain SQL?

      1 reply 0 retweets 0 likes
      RhodiumToad‏ @RhodiumToad 19 Sep 2019
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      Replying to @lukaseder @westermanndanie and

      Just count a billion rows: select count(*) from generate_series(1,1000) i, generate_series(1,1000) j, generate_series(1,1000) k; (be careful about using large generated series because those can spill to disk and introduce other overheads - better to crossjoin)

      6:30 PM - 19 Sep 2019
      1 reply 0 retweets 0 likes
        1. Lukas Eder‏ @lukaseder 19 Sep 2019
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          Replying to @RhodiumToad @westermanndanie and

          I would still want to make repeated measurements to get averaging effects though. I'm planning to actually include the average execution time and standard deviation in my benchmark.

          0 replies 0 retweets 0 likes
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