Re: Ideas to deal with table corruption

On Jan 6, 2018, at 12:11 PM, Corey Taylor <corey(dot)taylor(dot)fl(at)gmail(dot)com> wrote:
> 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."

One should also remember that the foreign key itself should usually be indexed, lest a delete on the referenced table require a table scan on the referencing table.

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Scott Ribe
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