Re: Logical Replication speed-up initial data

Hello,
in my experience, to speed up the initial load, I had to drop UKs and FKs.
Unfortunately, the initial load doesn't work in parallel and, for each
table, there is only one sync worker.

Regards

Stefano Amoroso

Il giorno mer 4 ago 2021 alle ore 17:24 Hüseyin Demir <
demirhuseyinn(dot)94(at)gmail(dot)com> ha scritto:

> Hello,
>
> I also faced a similar issue. Try removing the indexes on the destination
> first if possible. After that, you can add the indexes.
>
> Regards.
>
>
> Nikhil Shetty <nikhil(dot)dba04(at)gmail(dot)com>, 4 Ağu 2021 Çar, 18:07 tarihinde
> şunu yazdı:
>
>> Hi Team,
>>
>> We have a highly transactional system as the source of logical
>> replication and the database size is 500GB+. We are replicating all tables
>> from source using logical replication.
>>
>> For two tables the initial data load is very slow and it never completes
>> even after 24hrs+
>> Table size is under 100GB and index size is around 400GB.
>>
>> How can we increase the speed of the initial data load without dropping
>> the indexes on destination?
>>
>> We increased max_sync_workers_per_subscription to 3 but it didn't help
>> much for single tables
>>
>> Thanks,
>> Nikhil
>>
>
>
> --
> Hüseyin Demir
>
> Senior Database Platform Engineer
>
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>