Re: pg_dump fails when a table is in ACCESS SHARE MODE

Hello Rene,

Since I am using pg_wal_replay_pause before my pg_dump, it doesn't throw any error. Instead, it waits for the resource to release the lock so that it can proceed with taking the dump. the hot_standby_feedback is set to on

on my replica and primary.

Thanks,

Viral Shah

Data Analyst, Nodal Exchange LLC
viralshah009@gmail.com | (240) 645 7548

On Tue, Feb 25, 2020 at 10:36 AM Rene Romero Benavides <rene.romero.b@gmail.com> wrote:

On Tue, Feb 25, 2020 at 9:11 AM Viral Shah <viralshah009@gmail.com> wrote:

Hello All,

I am facing some problems while taking logical backup of my database using pg_dump. We have set up our infrastructure such that the logical backups are taken on our DR. Our intention here is to avoid substantial load on our primary server. We also pause and play wal files using pg_wal_replay_pause and pg_wal_replay_resume before and after pg_dump. However, at the time of pausing the wal replay, if there is a table under ACCESS SHARE MODE, the pg_dump cannot complete the backup. 

Can anyone suggest any better solution to take a logical backup using pg_dump where the table lock doesn't result in failure of the logical backup?

PS: we are using PostgreSQL 10.12

Thanks, 

Viral Shah

Data Analyst, Nodal Exchange LLC
viralshah009@gmail.com | (240) 645 7548

Hi Viral, what's the error pg_dump is throwing at you ? what's the current setting of standby_feedback in your replica? 

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