Re: [HACKERS] The number of bytes is stored in index_size of pgstatindex() ?

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От Peter Geoghegan
Тема Re: [HACKERS] The number of bytes is stored in index_size of pgstatindex() ?
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Msg-id CAM3SWZR5X+8QbUUh2xUuNJ8gPe7cm9Lr9CtEQafxkJoqQn-7+g@mail.gmail.com
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Ответ на Re: [HACKERS] The number of bytes is stored in index_size of pgstatindex() ?  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: [HACKERS] The number of bytes is stored in index_size of pgstatindex() ?
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On Thu, Feb 18, 2016 at 4:15 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Because they've been removed from the right-link/left-link chains.

That isn't the same thing as being inaccessible by scans, clearly
(just what you call the "leaf scan sequence"). Besides, half-dead
pages still have right-link/left-link chains, and there are usage
patterns where half-dead pages might accumulate.


--
Peter Geoghegan

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