| From: | Guillaume Lelarge <guillaume(at)lelarge(dot)info> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Cc: | Alexander Farber <alexander(dot)farber(at)gmail(dot)com>, pgsql-general <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Deleting takes days, should I add some index? |
| Date: | 2020-11-27 15:14:53 |
| Message-ID: | CAECtzeX8THbt4xQ1KaPS8-PmacanWBb_==6msk95KLuynCk2-g@mail.gmail.com |
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| Lists: | pgsql-general |
Le ven. 27 nov. 2020 à 16:05, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> a
écrit :
> On 2020-Nov-27, Alexander Farber wrote:
>
> > Referenced by:
> > TABLE "words_chat" CONSTRAINT "words_chat_gid_fkey" FOREIGN KEY (gid)
> > REFERENCES words_games(gid) ON DELETE CASCADE
> > TABLE "words_moves" CONSTRAINT "words_moves_gid_fkey" FOREIGN KEY
> (gid)
> > REFERENCES words_games(gid) ON DELETE CASCADE
> > TABLE "words_scores" CONSTRAINT "words_scores_gid_fkey" FOREIGN KEY
> > (gid) REFERENCES words_games(gid) ON DELETE CASCADE
>
> Make sure you have indexes on the gid columns of these tables. Delete
> needs to scan them in order to find the rows that are cascaded to.
>
>
An index on words_games(finished) and words_moves(played) would help too.
--
Guillaume.
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