select only 2-level domains.

select url from d_directories_backlinks where directory_id in (select entry_id from d_directories where lang='ja') and length(split_part(replace(get_host(url),'www.',''),'.',3))=0;

pg_autovacuum usage

this is how i use autovacuum.
pg_autovacuum -v 3 -V 0.001 -a 2 -A 0.01 -U user password -d 3 -s 100

usage: pg_autovacuum
[-D] Daemonize (Detach from tty and run in the background)
[-d] debug (debug level=0,1,2,3; default=0)
[-s] sleep base value (default=300)
[-S] sleep scaling factor (default=2.000000)
[-v] vacuum base threshold (default=1000)
[-V] vacuum scaling factor (default=2.000000)
[-a] analyze base threshold (default=500)
[-A] analyze scaling factor (default=1.000000)
[-L] logfile (default=none)
[-c] vacuum_cost_delay (default=none)
[-C] vacuum_cost_page_hit (default=none)
[-m] vacuum_cost_page_miss (default=none)
[-n] vacuum_cost_page_dirty (default=none)
[-l] vacuum_cost_limit (default=none)
[-U] username (libpq default)
[-P] password (libpq default)
[-H] host (libpq default)
[-p] port (libpq default)

remove accents from strings using postgresql

function remove_accents(&$str)
{
return svq("select convert(TO_ASCII(convert('".pg_escape_string($str)."','UNICODE','LATIN 1'),'LATIN 1'),'LATIN 1','UNICODE');");
}

pure ftp with postgres

in the conf file words User, Password, Dir must be enclosed in "" coz its special words

starting:
pure-ftpd-postgresql -l pgsql:/etc/pure-ftpd/db/postgresql.conf -A &