Re: slow query : very simple delete, 100% cpu, nearly no disk activity

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On Friday 11 September 2009 23:55:09 Merlin Moncure wrote:
> On Mon, Sep 7, 2009 at 5:05 AM, Vincent de Phily
> <vincent.dephily@xxxxxxxxxxxxxxxxx> wrote: 
> >                                     Table "public.message"
> >  Column   |            Type             |                      Modifiers
> > -----------+-----------------------------+-------------------------------
> >----------------------- id        | integer                     | not null
> > default
> > nextval('message_id_seq'::regclass)
> >  unitid    | integer                     | not null
> >  userid    | integer                     |
> >  refid     | integer                     |
> >
> > Indexes:
> >    "message_pkey" PRIMARY KEY, btree (id)
> >    "message_unitid_fromto_status_idx" btree (unitid, fromto, status)
> >    "message_userid_idx" btree (userid)
> > Foreign-key constraints:
> >    "message_refid_fkey" FOREIGN KEY (refid) REFERENCES message(id) ON
> > UPDATE CASCADE ON DELETE CASCADE
> >    "message_unitid_fkey" FOREIGN KEY (unitid) REFERENCES units(id) ON
> > UPDATE CASCADE ON DELETE CASCADE
> >    "message_userid_fkey" FOREIGN KEY (userid) REFERENCES users(id) ON
> > UPDATE CASCADE ON DELETE CASCADE
>
> where is the index on refid?

It's
"message_pkey" PRIMARY KEY, btree (id)
because
(refid) REFERENCES message(id)


-- 
Vincent de Phily
Mobile Devices
+33 (0) 666 301 306
+33 (0) 142 119 325

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