By large datasets I mean a database of which one of the tables contain more
than 42 million records.

Using SQLFORM.grid on such a dataset is very slow because the process wants
to count the total number of records.

I am using Postgresql.  I can get an estimated size of the table by
replacing count(*) with

# SELECT reltuples::integer FROM pg_class WHERE oid = 'isi.ritem'::regclass;
 reltuples
-----------
  42183232
(1 row)

And I get the result in a fraction of a second. When working on such a
scale the exact number of rows (count is also not always accurate on an
active database) is not a necessity.

Is there a way I can replace the count(*) in the grid with the query
illustrated above?

Regards
Johann
-- 
Because experiencing your loyal love is better than life itself,
my lips will praise you.  (Psalm 63:3)

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