On 29/07/15 21:13, CS DBA wrote:
> The documentation for pg_stat_activity lists this column:
>
> backend_xmin xid The current backend's xmin horizon.
>
> Can someone point me to a better understanding on "xmin horizon"?
https://momjian.us/main/writings/pgsql/mvcc.pdf
you can find this talk also on youtube. It's worth watching.
Torsten