From: | Thiemo Kellner <thiemo(at)gelassene-pferde(dot)biz> |
---|---|
To: | PostgreSQL General <pgsql-general(at)lists(dot)postgresql(dot)org> |
Subject: | Re: Is there something wrong with my test case? |
Date: | 2019-01-07 12:06:44 |
Message-ID: | 20190107120644.Horde.l9BLrQ2kzVh6KFqM5N7vij8@webmail.gelassene-pferde.biz |
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Lists: | pgsql-general |
Hi Fabio
Quoting Fabio Pardi <f(dot)pardi(at)portavita(dot)eu>:
> The cost is not a range. The 2 numbers you see are:
>
>
> *
> Estimated start-up cost. This is the time expended before the
> output phase can begin, e.g., time to do the sorting in a sort node.
>
> * Estimated total cost. This is stated on the assumption that
> the plan node is run to completion, i.e., all available rows are
> retrieved. In practice a node's parent node might stop short of
> reading all available rows (see the LIMIT example below).
>
> As you can read here:
>
> https://www.postgresql.org/docs/current/using-explain.html
Thanks for pointing this out. I was mislead than be the form those two
different things are displayed.
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