| From: | Michael Lewis <mlewis(at)entrata(dot)com> |
|---|---|
| To: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
| Cc: | postgann2020 s <postgann2020(at)gmail(dot)com>, pgsql-general <pgsql-general(at)postgresql(dot)org>, Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com> |
| Subject: | Re: Suggestion to improve query performance of data validation in proc. |
| Date: | 2020-05-22 14:26:05 |
| Message-ID: | CAHOFxGpchYLK0H0kNFQT1pfqk3oyMhEWNCaPsne5nzXLi4QJCQ@mail.gmail.com |
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| Lists: | pgsql-admin pgsql-general pgsql-performance |
On Fri, May 22, 2020 at 2:09 AM David G. Johnston <
david(dot)g(dot)johnston(at)gmail(dot)com> wrote:
> On Friday, May 22, 2020, postgann2020 s <postgann2020(at)gmail(dot)com> wrote:
>
>
>>
>> We are looking for a better query than "*SELECT 1 FROM
>> schema.table_name WHERE column1=structure_id1*" this query for data
>> validation.
>>
>
If many rows match potentially, then wrapping the query with select
exists(old_query) would allow the execution to bail asap.
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