Re: What's the best practice to compare the transaction with the checkpoint?
| От | Jialun Zhang |
|---|---|
| Тема | Re: What's the best practice to compare the transaction with the checkpoint? |
| Дата | |
| Msg-id | CAMFL+JjnQE8NWP1vMxfzJXFyjCP-9yvA6ku6FkJAjTpRkOoyTg@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: What's the best practice to compare the transaction with the checkpoint? (Laurenz Albe <laurenz.albe@cybertec.at>) |
| Ответы |
Re: What's the best practice to compare the transaction with the checkpoint?
|
| Список | 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.albe@cybertec.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
В списке pgsql-novice по дате отправления: