Michael Fuhr <[EMAIL PROTECTED]> writes:
> Further investigation shows that what really seems to be happening
> in 8.3devel is that the statistics for shared tables are reset every
> 15 seconds when autovacuum is enabled, which it is by default.  I
> don't observe this phenomenon when autovacuum is disabled.

OK, so it's just that pgstat_vacuum_tabstat() gets run by autovacuum.
So either form of Alvaro's patch should fix it.

                        regards, tom lane

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