| From: | Corey Taylor <corey(dot)taylor(dot)fl(at)gmail(dot)com> |
|---|---|
| To: | Melvin Davidson <melvin6925(at)gmail(dot)com> |
| Cc: | Peter Geoghegan <pg(at)bowt(dot)ie>, Luis Marin <luismarinaray(at)gmail(dot)com>, pgsql-admin(at)postgresql(dot)org, pgsql-general General <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Ideas to deal with table corruption |
| Date: | 2018-01-06 19:11:44 |
| Message-ID: | CADBz387cdv6JgKt7PqJa=6Lf7dVepq+DMpi5=m_tijJHS=RNmA@mail.gmail.com |
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| Lists: | pgsql-admin pgsql-general |
On Sat, Jan 6, 2018 at 12:30 PM, Melvin Davidson <melvin6925(at)gmail(dot)com>
wrote:
>
> *Don't forget to create indexes on the FK's in the table they reference!*
>
>
> *Also, it would be nice to know the PostgreSQL version and O/S.*
>
Is it possible for an index to not exist on those columns?
https://www.postgresql.org/docs/current/static/ddl-constraints.html#DDL-CONSTRAINTS-FK
"A foreign key must reference columns that either are a primary key or form
a unique constraint. This means that the referenced columns always have an
index (the one underlying the primary key or unique constraint); so checks
on whether a referencing row has a match will be efficient."
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