Re: Postgresql 9.5 committing and log sequence number

Poul Kristensen wrote:
> How come that repeating
> SELECT txid_current();
> 
> makes 1 added to xid
> shown by
> select * from pg_last_committed_xact();
> 
> 
> repeating
> 
> select * from pg_last_committed_xact();
> 
> does not add 1 for each repeat of
> select * from pg_last_committed_xact();

The documentation says about txid_current():

  get current transaction ID, assigning a new one if the current transaction
  does not have one

Since the query runs in ist own transaction, each invocation
will assign a new transaction ID.

Yours,
Laurenz Albe