| From: | Abhijit Menon-Sen <ams(at)2ndquadrant(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: a fast bloat measurement tool |
| Date: | 2014-04-03 04:33:20 |
| Message-ID: | 20140403043320.GB20877@toroid.org |
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| Thread: | |
| Lists: | pgsql-hackers |
At 2014-04-02 20:10:54 -0400, robertmhaas(at)gmail(dot)com wrote:
>
> I think it might underestimate free space relative to tuples because
> the free space map isn't guaranteed to be completely correct. But I
> guess you knew that already...
Yes, and tuple_len is already a slight overestimate (because it counts
the line pointer array as live tuple space for skipped pages). But for
the speedup it provides, I believe the result is still useful.
I'll mention the potential for free-space inaccuracy in the README.
-- Abhijit
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