hello. i tested how are distributed values xmin,xmax on pages. in my tables . typically there are no more than 80 records on pages. maybe its possible to compress xmin & xmax values to 1 byte/per record (+table of transactions per page)? its reduce the space when more than 1 record is from the same transaction. Testing query: SELECT (string_to_array(ctid::text,','))[1] as page ,count(*) as records ,array_upper(array_agg(distinct (xmin::text)),1) as trans FROM only "Rejestr stacji do naprawy" group by (string_to_array(ctid::text,','))[1] order by 3 desc ------------ pasman -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
