Re: How to find transaction ID

> From: Glyn Astill <glynastill(at)yahoo(dot)co(dot)uk>
> To: "ascot(dot)moss(at)gmail(dot)com" <ascot(dot)moss(at)gmail(dot)com>; PostgreSQL general <pgsql-general(at)postgresql(dot)org>
> Cc:
> Sent: Thursday, 8 August 2013, 15:20
> Subject: Re: [GENERAL] How to find transaction ID
>
>
>
>> From: "ascot(dot)moss(at)gmail(dot)com" <ascot(dot)moss(at)gmail(dot)com>
>> To: PostgreSQL general <pgsql-general(at)postgresql(dot)org>
>> Cc: ascot(dot)moss(at)gmail(dot)com
>> Sent: Thursday, 8 August 2013, 14:52
>> Subject: [GENERAL] How to find transaction ID
>>
>> Hi,
>>
>> I am trying some restore tools,  can you advise how to find the latest
>> transaction ID in PostgreSQL and the transaction ID at a particular
>> "Point-In-Time"?
>>
>
> Hmm, it's not clear entirely what you want.  Afaik "select
> txid_current()" should get you the current transaction id. The column xmin
> for a row from any table will get you the inserting transaction id, and xmax
> will get you the deleting (or attempted delete) transaction id.
>
> See http://www.postgresql.org/docs/9.0/static/functions-info.html
>

I guess I shouldn't have said that about xmin and xmax; you can't rely on those columns in various circumstances i.e. after a vacuum.