On 08/28/2015 10:12 AM, Dominik Czarnota wrote:
> Oh... I have copied stacktrace generated from Python script which
> connects to the db using psycopg2 driver, so that's where this
> misleading psycopg2 error came from...
>
> About the list origin - I have to calculate a lot of stuff for each
> stock on stock exchange market. Each calculation requires quotes from
> the database - so to reduce io and not to fetch them everytime from
> Python, I've created a plpythonu function that calculates everything for
> each stock.
> As the results also have to stay in the database, I need to use the
> fastest possible method to insert a lot of data.
This means moving the results to another table?
Have you looked at plpy.cursor here:
http://www.postgresql.org/docs/9.4/interactive/plpython-database.html
>
> Another problem for those calculations would be parallelizing them
> somehow (I hope postgres clustering will do the work), but that's
> totally unrelated to the problem we are discussing now.
>
>
--
Adrian Klaver
adrian.klaver@aklaver.com