Re: What's the best practice to compare the transaction with the checkpoint?

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