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0001 
0002 1. Dynamic (non-buffered cursors) in PostgreSQL
0003 To avoid big memory consuming, we will need to use backend-side (native) cursors
0004 with "DECLARE CURSOR" statement. Otherwise KDbCursor needs to be buffered.
0005 
0006 https://archives.postgresql.org/pgsql-interfaces/2000-09/msg00082.php
0007