Re: First draft of the PG 15 release notes

On Thu, May 12, 2022 at 11:12:54AM -0300, Euler Taveira wrote:
OB> On Thu, May 12, 2022, at 11:03 AM, Bruce Momjian wrote:
> 
>     I looked at that but thought that everyone would already assume we
>     skipped replication of empty transactions, and I didn't see much impact
>     for the user, so I didn't include it.
> 
> It certainly has an impact on heavy workloads that replicate tables with few
> modifications. It receives a high traffic of 'begin' and 'commit' messages that
> the previous Postgres versions have to handle (discard). I would classify it as
> a performance improvement for logical replication. Don't have a strong opinion
> if it should be mentioned or not.

Oh, so your point is that a transaction that only has SELECT would
previously send an empty transaction?  I thought this was only for apps
that create literal empty transactions, which seem rare.

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EDB                                      https://enterprisedb.com

  Indecision is a decision.  Inaction is an action.  Mark Batterson