Re: [GENERAL] xmin increasing within a transaction block?

Hi,

On 2017-11-06 10:36:06 +0100, Luca Ferrari wrote:
> Hi all,
> I suspect this has a trivial explaination, but this is what I'm experiencing:
> 
> > CREATE TABLE foo( i int );
> > BEGIN;
> * > INSERT INTO foo(i) VALUES( 1 );
> * > INSERT INTO foo(i) VALUES( 2 );
> * > SELECT xmin, cmin, xmax, cmax, i FROM foo;
>  xmin | cmin | xmax | cmax | i
> ------+------+------+------+---
>  2466 |    0 |    0 |    0 | 1
>  2467 |    1 |    0 |    1 | 2
> (2 rows)
> 
> * > SELECT txid_current();
>  txid_current
> --------------
>          2465
> (1 row)
> 
> 
> Why is xmin greater than the current transaction id (and most notably
> not "fixed")?
> What am I missing here?
> I'm running 9.6.5.

That doesn't look like plain postgres behaviour to me. Any chance you're
using a pooler in statement mode in front of postgres?

Greetings,

Andres Freund


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