Re: speed up full table scan using psql

On 5/31/23 13:57, Lian Jiang wrote:
> The command is: psql $db_url -c "copy (select row_to_json(x_tmp_uniq) 
> from public.mytable x_tmp_uniq) to stdout"
> postgres version:  14.7
> Does this mean COPY and java CopyManager may not help since my psql 
> command already uses copy?
> 
> Regarding pg_dump, it does not support json format which means extra 
> work is needed to convert the supported format to jsonl (or parquet) so 
> that they can be imported into snowflake. Still exploring but want to 
> call it out early. Maybe 'custom' format can be parquet?

Oops I read this:

'...Using spark to read the postgres table...'

and missed that you are trying to load into Snowflake.

It seems Snowflake supports CSV as well:

https://docs.snowflake.com/en/user-guide/data-load-prepare

So the previous advice should still hold.


> 
> 
> Thanks
> Lian

-- 
Adrian Klaver
adrian.klaver@aklaver.com