| From: | Joshua Bay <joshuabay93(at)gmail(dot)com> |
|---|---|
| To: | Craig Ringer <craig(at)2ndquadrant(dot)com> |
| Cc: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Fabrízio Mello <fabriziomello(at)gmail(dot)com> |
| Subject: | Re: Way to access LSN (for each transaction) by directly talking to postgres? |
| Date: | 2016-08-03 17:35:52 |
| Message-ID: | CABb-U3axvtZKEKr1VT-CTDwFton8jLPEQvydWN4vL-ZODp4g8w@mail.gmail.com |
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| Lists: | pgsql-hackers |
Thanks for responses!
The problem I wanted to solve was to find the (global) order of commits
across the postgres cluster. So, my attempt was to use the LSN.
On Wed, Aug 3, 2016 at 9:47 AM, Craig Ringer <craig(at)2ndquadrant(dot)com> wrote:
>
>
> On 3 August 2016 at 11:37, Joshua Bay <joshuabay93(at)gmail(dot)com> wrote:
>
>> Hi,
>>
>> Could you please let me know if there is a way to get LSN of each
>> transaction by directly communicating with Postgres server and NOT by
>> accessing logs.
>>
>
>
> To what end? What problem are you trying to solve?
>
> What LSN, exactly? The LSN of the first write and xid allocation? The LSN
> of the commit record? What if it's a complex commit like with prepared
> xacts?
>
>
> --
> Craig Ringer http://www.2ndQuadrant.com/
> PostgreSQL Development, 24x7 Support, Training & Services
>
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