Re: pg_clog questions

["Gourish Singbal" <gourish@xxxxxxxxx>]

 

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@xxxxxxxxx> 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@xxxxxxxxxxxxxxxxx > 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/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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--
Best,
 

Gourish Singbal

-- 
Best,
Gourish Singbal