On July 23, 2018 1:33:11 PM PDT, Alvaro Herrera <alvherre@xxxxxxxxxxxxxxx> wrote: >On 2018-Jul-23, Andres Freund wrote: > >> Hi, >> >> On 2018-07-23 21:03:32 +0300, Mariel Cherkassky wrote: >> > Today I faced a situation where I saw a postgresql 9.2 database >that had >> > duplicated rows in pg_autid. I saw 6 roles while 3 of them were >duplicated >> > (3 uniques rolenames in total). I checked and the oid of the >duplicates >> > were the same oid as the originals. The solution was running vacuum >on the >> > table but I wanted to understand how this situation was created ? >Why even >> > with unique index on the rolname I saw duplicated values for >rolname ? >> >> That suggests some form of corruption. Which version of 9.2 did this >> occur on? Did you have any OS level crashes? Ran with fsync=off? > >I have vague memories of seeing this recently. Can you please show It's at least one of the potential effects of the out-of-date shared relcache bug I recently fixed (but wasn't backpatched to 9.2, as it's unsupported). Andres -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
