| From: | Thom Brown <thom(at)linux(dot)com> |
|---|---|
| To: | Kevin Grittner <kgrittn(at)gmail(dot)com> |
| Cc: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Steve Singer <steve(at)ssinger(dot)info>, Kevin Grittner <kgrittn(at)ymail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: snapshot too old, configured by time |
| Date: | 2016-03-21 19:21:56 |
| Message-ID: | CAA-aLv5r3QXCU44qLt88cTcnGOqGxPTsLBM7S-pndkQ3RmG=yA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 17 March 2016 at 21:15, Kevin Grittner <kgrittn(at)gmail(dot)com> wrote:
> New patch just to merge in recent commits -- it was starting to
> show some bit-rot. Tests folded in with main patch.
In session 1, I've run:
# begin transaction isolation level repeatable read ;
BEGIN
*# declare stuff scroll cursor for select * from test where num between 5 and 9;
DECLARE CURSOR
*# fetch forward 5 from stuff;
id | num | thing
-----+-----+------------------------------------
2 | 8 | hellofji djf odsjfiojdsif ojdsiof
3 | 7 | hellofji djf odsjfiojdsif ojdsiof
112 | 9 | hellofji djf odsjfiojdsif ojdsiof
115 | 6 | hellofji djf odsjfiojdsif ojdsiof
119 | 8 | hellofji djf odsjfiojdsif ojdsiof
(5 rows)
In session 2, over a min later:
# update test set num = 12 where num between 5 and 9 and id between 120 and 250;
ERROR: snapshot too old
Then back to session 1:
*# fetch forward 5 from stuff;
ERROR: snapshot too old
Should session 2 be getting that error?
Thom
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