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ITAGAKI Takahiro wrote:
> Here is a patch discussed in
> http://archives.postgresql.org/pgsql-hackers/2007-02/msg00010.php
>
> Concurrent vacuum will save n_dead_tuples value at the beginning.
> Stats collector will be subtract the value from n_dead_tuples
> instead of setting it to zero. The statistics accuracy of n_dead_tuples
> will be better, especially just after finish of a vacuum.
>
> The behavior in VACUUM FULL is not changed because concurrent updates
> are not allowed during VACUUM FULL.
>
> Comments welcome.
>
> Regards,
> ---
> ITAGAKI Takahiro
> NTT Open Source Software Center
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