Re: Index only scan sometimes switches to sequential scan for small amount of rows

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От Feike Steenbergen
Тема Re: Index only scan sometimes switches to sequential scan for small amount of rows
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Msg-id CAK_s-G1fH2Rv8K7i6vKRj1=xr6s3E1bJvFT7RcgEMz5BBAtgDw@mail.gmail.com
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Ответ на Re: Index only scan sometimes switches to sequential scan for small amount of rows  (Jeff Janes <jeff.janes@gmail.com>)
Список pgsql-performance
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On 25 March 2015 at 22:45, Jeff Janes <jeff.janes@gmail.com> wrote:

> How can the avg_width be 4 when the vast majority of entries are 7
> characters long?

The datatype is an enum, as I understand it, an enum type always
occupies 4 bytes

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