From: | Jialun Zhang <reatank(at)gmail(dot)com> |
---|---|
To: | Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at> |
Cc: | pgsql-novice(at)lists(dot)postgresql(dot)org |
Subject: | Re: What's the best practice to compare the transaction with the checkpoint? |
Date: | 2020-07-06 14:09:35 |
Message-ID: | CAMFL+JjnQE8NWP1vMxfzJXFyjCP-9yvA6ku6FkJAjTpRkOoyTg@mail.gmail.com |
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Lists: | pgsql-novice |
Thanks! But what I actually mean is how to do this in the backend source
code. I think I could find a way to do this SELECT in backend.
Thank you,
Jialun Zhang
Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at> 于2020年7月6日周一 上午4:09写道:
> On Sat, 2020-07-04 at 12:19 -0400, Jialun Zhang wrote:
> > I am trying to add code to determine whether the transaction is
> checkpointed or not.
> > So I think I need to compare the transaction ID with the checkpoint's
> and determine
> > whether it is older or not. Could anyone tell me what's the best
> practice of doing
> > this in Postgres? Is it done somewhere in the existing code?
>
> You could use
>
> SELECT next_xid FROM pg_control_checkpoint();
>
> to get information about the last checkpoint.
>
> I refrain from asking what the point of the exercise is...
>
> Yours,
> Laurenz Albe
> --
> Cybertec | https://www.cybertec-postgresql.com
>
>
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