RE: why select count(*) consumes wal logs

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От Kumar, Virendra
Тема RE: why select count(*) consumes wal logs
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Msg-id b679068d5f1b4d0e99463cf646121059@USFKL11XG20CN01.mercer.com
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Ответ на Re: why select count(*) consumes wal logs  (Ron <ronljohnsonjr@gmail.com>)
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I concord.

Why VACUUM when there is no update or deletes.

 

Regards,

Virendra

 

From: Ron [mailto:ronljohnsonjr@gmail.com]
Sent: Tuesday, November 06, 2018 12:20 PM
To: pgsql-general@lists.postgresql.org
Subject: Re: why select count(*) consumes wal logs

 

On 11/06/2018 11:12 AM, Michael Nolan wrote:

On Tue, Nov 6, 2018 at 11:08 AM Ravi Krishna <srkrishna1@aol.com> wrote:

PG 10.5

I loaded 133 million rows to a wide table (more than 100 cols) via COPY.

 

It's always a good idea after doing a large scale data load to do a vacuum analyze on the table (or the entire database.)

 


I understand the need to ANALYZE (populate the histograms needed by the dynamic optimizer), but why VACUUM (which is recommended after updates and deletes).

Thanks

--
Angular momentum makes the world go 'round.




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