BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select supp_nation, cust_nation, l_year, sum(volume) as revenue from ( select n1.n_name as supp_nation, n2.n_name as cust_nation, extract(year from l_shipdate) as l_year, l_extendedprice * (1 - l_discount) as volume from supplier, lineitem, orders, customer, nation n1, nation n2 where s_suppkey = l_suppkey and o_orderkey = l_orderkey and c_custkey = o_custkey and s_nationkey = n1.n_nationkey and c_nationkey = n2.n_nationkey and ( (n1.n_name = 'JORDAN' and n2.n_name = 'KENYA') or (n1.n_name = 'KENYA' and n2.n_name = 'JORDAN') ) and l_shipdate between date '1995-01-01' and date '1996-12-31' ) as shipping group by supp_nation, cust_nation, l_year order by supp_nation, cust_nation, l_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- GroupAggregate (cost=2359668.83..2361570.18 rows=58503 width=64) (actual time=94210.624..94239.502 rows=4 loops=1) Buffers: shared hit=722280 read=709813 dirtied=1060 written=19744 -> Sort (cost=2359668.83..2359815.09 rows=58503 width=64) (actual time=94200.722..94207.230 rows=58623 loops=1) Sort Key: n1.n_name, n2.n_name, (date_part('year'::text, (lineitem.l_shipdate)::timestamp without time zone)) Sort Method: quicksort Memory: 9780kB Buffers: shared hit=722280 read=709813 dirtied=1060 written=19744 -> Hash Join (cost=896474.49..2355036.50 rows=58503 width=64) (actual time=43790.736..93834.697 rows=58623 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=722272 read=709813 dirtied=1060 written=19744 -> Hash Join (cost=891795.49..2320228.32 rows=1462582 width=72) (actual time=43637.909..89730.246 rows=1457473 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=720090 read=709813 dirtied=1060 written=19744 -> Bitmap Heap Scan on lineitem (cost=387230.13..1732423.73 rows=18296907 width=20) (actual time=15705.001..38291.722 rows=18247443 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=440521 read=676439 dirtied=1060 written=19744 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382655.90 rows=18296907 width=0) (actual time=15010.200..15010.200 rows=18320255 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=2 read=49813 written=22 -> Hash (cost=489502.50..489502.50 rows=1205029 width=60) (actual time=27932.006..27932.006 rows=1199667 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107783kB Buffers: shared hit=279569 read=33374 -> Hash Join (cost=15638.06..489502.50 rows=1205029 width=60) (actual time=571.037..26964.963 rows=1199667 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=279569 read=33374 -> Seq Scan on orders (cost=0.00..405283.20 rows=15074920 width=8) (actual time=0.013..5072.963 rows=15015000 loops=1) Buffers: shared hit=221579 read=32955 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=570.892..570.892 rows=119385 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10726kB Buffers: shared hit=57990 read=419 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=25.735..487.351 rows=119385 loops=1) Buffers: shared hit=57990 read=419 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.171..0.373 rows=2 loops=1) Join Filter: (((n1.n_name = 'JORDAN'::bpchar) AND (n2.n_name = 'KENYA'::bpchar)) OR ((n1.n_name = 'KENYA'::bpchar) AND (n2.n_name = 'JORDAN'::bpchar))) Rows Removed by Join Filter: 623 Buffers: shared hit=3 -> Index Scan using pk_nation on nation n1 (cost=0.00..12.63 rows=25 width=30) (actual time=0.020..0.043 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.003 rows=25 loops=25) Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.005..0.008 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=26.846..221.532 rows=59692 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=57987 read=419 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=18.460..18.460 rows=59692 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=3 read=330 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=151.746..151.746 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=2179 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.017..96.235 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 94276.991 ms (53 rows) COMMIT; COMMIT