| From: | "Dean Gibson (DB Administrator)" <postgresql(at)ultimeth(dot)com> |
|---|---|
| To: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Foreign keys |
| Date: | 2013-12-18 19:59:50 |
| Message-ID: | 52B1FEB6.7000608@ultimeth.com |
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| Thread: | |
| Lists: | pgsql-general |
On 2013-12-18 10:41, Kevin Grittner wrote:
> Dean Gibson (DB Administrator) <postgresql(at)ultimeth(dot)com> wrote:
>
>> ... that clearly spends some time building a separate index.
> No it doesn't. If you are observing activity at that time, it is probably from validating that the constraint is initially valid.
Ah ha! That's what's consuming the time! Thanks!
>
>> 5. If I need the separate index on Y, should it be built before or after the FOREIGN KEY constraint?
> In some cases it may allow faster initial validation of the constraint; if I wanted the index I would probably build it before adding the constraint.
Again, that's what I needed to know! Thanks again!
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