Re: [GENERAL] Why so long?

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От Jeff Janes
Тема Re: [GENERAL] Why so long?
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Msg-id CAMkU=1xdO_wJK0YQCouxdoRZBSrzjZmw76_u158e6H=C1HSS6g@mail.gmail.com
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Ответ на [GENERAL] Why so long?  (Steve Clark <steve.clark@netwolves.com>)
Ответы Re: [GENERAL] Why so long?
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On Wed, Apr 19, 2017 at 8:24 AM, Steve Clark <steve.clark@netwolves.com> wrote:
Hello,

I am confused. I have a table that has an incrementing primary key id.

When I select max(id) from table is returns almost instantly but
when I select min(id) from table it takes longer than I want to wait.

Shouldn't postgresql be able to quickly find the minimum id value in the index?

Not if the low end of the index is stuffed full of obsolete entries, which haven't been cleaned up because it is not being vacuumed often enough.

Do you have autovacuum on?  Have you manually vacuumed the table recently?

Cheers,

Jeff

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