On Wed, Apr 20, 2022 at 04:40:44PM -0700, David G. Johnston wrote: > Hackers, > > The new cumulative stats subsystem no longer has a "lost under heavy load" > problem so that parenthetical should go (or at least be modified). > > These stats can be reset so some discussion about how the system uses them > given that possibility seems like it would be good to add here. I'm not sure > what that should look like though. > > diff --git a/doc/src/sgml/maintenance.sgml b/doc/src/sgml/maintenance.sgml > index 04a04e0e5f..360807c8f9 100644 > --- a/doc/src/sgml/maintenance.sgml > +++ b/doc/src/sgml/maintenance.sgml > @@ -652,9 +652,8 @@ vacuum insert threshold = vacuum base insert threshold + > vacuum insert scale fac > tuples to be frozen by earlier vacuums. The number of obsolete tuples > and > the number of inserted tuples are obtained from the cumulative statistics > system; > it is a semi-accurate count updated by each <command>UPDATE</command>, > - <command>DELETE</command> and <command>INSERT</command> operation. (It > is > - only semi-accurate because some information might be lost under heavy > - load.) If the <structfield>relfrozenxid</structfield> value of the table > + <command>DELETE</command> and <command>INSERT</command> operation. > + If the <structfield>relfrozenxid</structfield> value of the table > is more than <varname>vacuum_freeze_table_age</varname> transactions old, > an aggressive vacuum is performed to freeze old tuples and advance > <structfield>relfrozenxid</structfield>; otherwise, only pages that have > been modified
Yes, I agree and plan to apply this patch soon. -- Bruce Momjian <br...@momjian.us> https://momjian.us EDB https://enterprisedb.com Indecision is a decision. Inaction is an action. Mark Batterson
