Re: Curious about dead rows. - Mailing list pgsql-performance

Jean-David Beyer <jeandavid8@verizon.net> writes:
> I am doing lots of INSERTs on a table that starts out empty (I did a
> TRUNCATE on it). I am not, AFAIK, doing DELETEs or UPDATEs. Autovacuum is
> on. I moved logging up to debug2 level to see what was going on, and I get
> things like this:

>  "vl_as": scanned 3000 of 5296 pages, containing 232944 live rows and 1033
> dead rows; 3000 rows in sample, 411224 estimated total rows

> A little later, it says:

> "vl_as": scanned 3000 of 6916 pages, containing 233507 live rows and 493
> dead rows; 3000 rows in sample, 538311 estimated total rows

Well, *something* is doing deletes or updates in that table.  Better
look a bit harder at your application ...

            regards, tom lane