Re: pg_clog questions

Wanted to know when is the feature of automatically removing the unwanted
pg_clog files going to be implemented in postgresql ...

http://www.postgresql.org/docs/7.4/interactive/wal-benefits-later.html

this link is not present in 8.1.4 docs ...

Thanks for all the help

On 5/26/06, Gourish Singbal <gourish(at)gmail(dot)com> wrote:
>
>
> Ok After reading this mail i too went to check out pg_clog and noticed
> that there were 368 file dating back to the day we had installed postgresql
> and occuping 92 MB od space.
>
> So i decided to vacuum the postgres and template1 databases since the
> other databases are database - wide vacuumed daily.
>
> vacuuming postgres database did not do any good so went to template1 . On
> completion found that the files had reduced to 109 number and size of
> pg_clog was 27 MB now.
>
> But still these were too many files hence decide to peform vacuum freeze
> on template1 and postgres databases. on finishing .. checked the pg_clog dir
> and found that there was just one file there
>
> drwx------ 10 postgres wheel 632 2006-05-25 23:15 ..
> drwx------ 2 postgres wheel 72 2006-05-25 23:20 .
> -rw------- 1 postgres wheel 172032 2006-05-25 23:35 016C
>
> and if i am not mistaken this is the only file that the postgres is using
> at this time.
>
> also age went down to
> postgres=# SELECT datname, age(datfrozenxid) FROM pg_database;
> datname | age
> ---------------------+------------
> postgres | 73
> template1 | 128
> template0 | 382360894
> ...etc
>
> thanks for the info in the email thread.
>
>
> On 5/26/06, Alvaro Herrera <alvherre(at)commandprompt(dot)com> wrote:
> >
> > Benjamin Krajmalnik wrote:
> > > I just ran both VACUUM ANALYZE and VACUUM on all of the databases (the
> > > project database and the database created for the default user).
> > > All of the commit logs are still there.
> >
> > Did you vacuum the template1 (and possibly postgres) databases as well?
> >
> > > Do they get cleared only by VACUUM FULL?
> >
> > No, VACUUM suffices.
> >
> > > On another subject, is there a query I can run to find out who the
> > owner
> > > of a filenode is?
> >
> > Sure -- pg_class.relowner from pg_class where relfilenode = ' ... '
> >
> > --
> > Alvaro Herrera
> > http://www.CommandPrompt.com/ <http://www.commandprompt.com/>
> > PostgreSQL Replication, Consulting, Custom Development, 24x7 support
> >
> > ---------------------------(end of broadcast)---------------------------
> >
> > TIP 9: In versions below 8.0, the planner will ignore your desire to
> > choose an index scan if your joining column's datatypes do not
> > match
> >
>
>
>
> --
> Best,
>
> Gourish Singbal
>

--
Best,
Gourish Singbal