| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Dinko Papak <rimokatolik(at)outlook(dot)com> |
| Cc: | "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Are indices used for creating check constraints? |
| Date: | 2018-10-22 18:12:18 |
| Message-ID: | 83722.1540231938@sss.pgh.pa.us |
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| Lists: | pgsql-general |
Dinko Papak <rimokatolik(at)outlook(dot)com> writes:
> Here are 3 interesting (to me) numbers:
> 1. creating index on expression (func(timestamp)) takes 5 seconds
> 2. creating check constraint on the same expression takes 10 seconds
> 3. adding partition table based on the same expression without check expression takes 20 seconds (this has been resolved by answer from David Rowley)
Hmm ...
> Is it possible to use indices to create check expressions?
No.
> Why is 2. twice as long as 1.?
Good question. Could you provide a concrete test case?
regards, tom lane
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