Re: [BUGS] Concurrent ALTER SEQUENCE RESTART Regression

On 2017-04-26 22:07:03 -0400, Peter Eisentraut wrote:
> On 4/26/17 21:12, Andres Freund wrote:
> > I think it's unacceptable to regress with an error message here.  I've
> > seen sequence DDL being used while concurrent DML was onging in a number
> > of production use cases, and just starting to error out instead of
> > properly blocking doesn't seem acceptable to me.
> 
> It's not clear to me what the use case is here that we are optimizing
> for.  The best solution would depend on that.  Running concurrent ALTER
> SEQUENCE in a tight loop is probably not it. ;-)

Oh, and there's absolutely no need for a loop or anything:

A: CREATE SEQUENCE someseq
A: BEGIN;
A: ALTER SEQUENCE someseq RESTART ;
B: ALTER SEQUENCE someseq RESTART ;
A: COMMIT;
B: ERROR:  XX000: tuple concurrently updated

- Andres


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