Improve "select count(*)" query - takes more than 30 mins for some large tables

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To: Pgsql-admin <pgsql-admin@xxxxxxxxxxxxxxxxxxxx>
Subject: Improve "select count(*)" query - takes more than 30 mins for some large tables
From: Raj kumar <rajkumar820999@xxxxxxxxx>
Date: Mon, 11 Jul 2022 12:46:23 +0530
Cc: Raj kumar <rajkumar820999@xxxxxxxxx>

Hi,

How can I improve "select count(*)" for larger tables? I'm doing a db migration and need to validate the data count.
"select count(*) " queries are taking more than 30 minutes for some tables which is more than the downtime we have.

Will work_mem increase help? or how can i speed up this row count?

Thanks,

Raj

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- Re: Improve "select count(*)" query - takes more than 30 mins for some large tables
  - From: Florents Tselai

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