Re: Issue with Restore dump with plpythonu, plpython3u installed on postgres16

On 9/4/24 03:48, Sam Son wrote:
> Hi Adrian, Muhammad,
>
> Thanks for the quick response.
>
> For new I cannot do changes in old version DB, since it is deployed
> remotely and i dont have any access. And it has to be done from multiple
> servers.
>
> As a work around I tried two solutions.

Both of which depend on the plpythonu functions running with plpython3u,
in other words that they are Python3 compatible. Have you verified that?

>
> *Solution 1:*
>
> After downloading and extracting the dump, convert the pgdump file to
> sql file which is editable.
>
> *    pg_restore -f out_dump.sql dump.pgdump*
>
> Replace all the plpythonu references with plputhon3u.
>
> Restore using the sql file.
>
> *    sudo -H -u postgres psql -p 5433 -d db_name <  out_dump.sql*

I would suggest working on the schema portion separate from the data:

pg_restore -s -f out_dump_schema.sql dump.pgdump*

Do your search and replace, restore to database and then:

pg_restore -a ... dump.pgdump*

Where -a is data only.

In fact if you have control of the pg_dump break it into two parts:

pg_dump -s ... --schema

pg_dump -a ... --data only

>
>
> *Solution 2:*
>
> After downloading and extracting the dump, get the list of items in dump
> (Schemas, tables, table data, Index, functions, etc).
>
> *    pg_restore -l dump.pgdump > dump.txt*
>
> Delete all the function references which have plpython3u.

I'm guessing you meant plpythonu above.

> *Question:*
>
> Our database size is 500GB,
>
> Do we see any performance impact using solution 1. Since solution 1 is
> using sql file load and solution 2 is using pg_restore directly.
>
> Kindly recommend what to choose, solution 1 or solution 2 or any other
> workaround to restore.

Personally I would go with solution 1 with the modifications I suggested.

>
>
> Thanks,
> Samson G
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com