Re: Vacuum on the database versus individual tables.

2009/6/25 Grzegorz Jaśkiewicz <gryzman(at)gmail(dot)com>:
> 2009/6/25 Hartman, Matthew <Matthew(dot)Hartman(at)krcc(dot)on(dot)ca>:
>> Windows XP, PostgreSQL 8.3.5, using pgAdmin III 1.8.4. It's the typical "Running vacuum on this table is recommended" dialog box.
>
> Well, it really has nothing to do with postgresql it self. Either it
> is a bug or property of PgAdmin, but I don't know.
> Either someone who knows more about pgadmin is going to respond here,
> or you have to ask on pgadmin list.

pgAdmin will advise vacuuming a table if there is a significant
discrepancy between the number of rows in the table and the value in
pg_class.reltuples. i forget the exact algorithm off-hand, but it
takes the size of the table into account, and is looking for a %age
difference between the value, not a set number of rows.

--
Dave Page
EnterpriseDB UK: http://www.enterprisedb.com