Andrey Chursin <andll@xxxxxxxxxxx> writes: > I need to create cursor, open it, fetch records one-by-one and > aggregate. Then on some condition I stop fetching and return > aggregated value. In fact in most cases my procedure scans a little > part of table. > But does postgres understand such usage of index and cursors? Not unless you tell it. You may need to reduce the value of cursor_tuple_fraction to inform the planner that you're only expecting to fetch a small part of the cursor's theoretical output. regards, tom lane -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
