Re: [ADMIN] vacuum verbose relations reporting

Jeff Frost wrote:

Alvaro Herrera wrote:

Jeff Frost wrote:    

Tom, is there an easy (or hard) way to count relations from all DBs by  using the system catalogs?     

 Just do a count(*) from pg_class where relkind in ('r', 't', 'i'), and sum across all databases (you need to connect to each one).  (Actually you only need to count indexes that are btrees, if you need such a distinction.  Other indexes do not use the FSM as far as I know).   

Perfect, so here's a little script that does the trick then:

#!/bin/sh

PSQL=/usr/bin/psql
DATABASES=$($PSQL -lt |  awk {'print $1'} | grep -v template0 )
RELATIONS=0

for DB in $DATABASES; do
    RELATIONS=$(($RELATIONS + $($PSQL --tuples-only --command "select count(*) from pg_class where relkind IN ('r', 't', 'i');" $DB) ))
done

echo $RELATIONS

I guess this isn't entirely accurate, as the above script returns 35883, but vacuum verbose returns:

INFO:  free space map contains 111435 pages in 10005 relations

If I take out the toast tables and indexes, I get a result much closer to what vacuum verbose returns: 10626  which might just be because the vacuum verbose ran a few hours ago.

So, the question is, do the FSM settings take into account toast tables and indexes as Alvaro suggested and vacuum verbose isn't properly reporting on it?

--  Jeff Frost, Owner 	<jeff@frostconsultingllc.com> Frost Consulting, LLC 	http://www.frostconsultingllc.com/ Phone: 916-647-6411	FAX: 916-405-4032