| From: | Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at> |
|---|---|
| To: | Raj Gandhi <raj01gandhi(at)gmail(dot)com>, pgsql-admin(at)postgresql(dot)org |
| Subject: | Re: LIMIT OFFSET with DB view vs plain SQL |
| Date: | 2019-03-29 13:53:10 |
| Message-ID: | 1bbde4f2929ef4f5cf145ccffaca3d3f6e27a7bd.camel@cybertec.at |
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| Lists: | pgsql-admin pgsql-performance |
Raj Gandhi wrote:
> I’m using LIMIT offset with DB view. Looks like query planner is applying the LIMIT for DB view at the end after processing all rows.
> When running same SQL that was used to create the DB view, LIMIT is applied earlier so the query is much faster.
>
> Explain plan using DB view
> https://explain.depesz.com/s/gzjQ
>
> Explain plan using raw SQL
> https://explain.depesz.com/s/KgwO
>
> In both tests LIMIT was 100 with offset = 0.
> Is there any way to force DB view to apply limit earlier?
Please show
- the view definition
- the query on the view
- the query without the view
Yours,
Laurenz Albe
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