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 = 'KENYA' and n2.n_name = 'MOROCCO') or (n1.n_name = 'MOROCCO' and n2.n_name = 'KENYA') ) 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=2355409.21..2357306.79 rows=58387 width=64) (actual time=93698.833..93729.355 rows=4 loops=1) Buffers: shared hit=1050545 read=378953 dirtied=1059 written=446 -> Sort (cost=2355409.21..2355555.18 rows=58387 width=64) (actual time=93688.328..93697.449 rows=58351 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: 9742kB Buffers: shared hit=1050545 read=378953 dirtied=1059 written=446 -> Hash Join (cost=895129.10..2350786.90 rows=58387 width=64) (actual time=45908.720..93381.904 rows=58351 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1050537 read=378953 dirtied=1059 written=446 -> Hash Join (cost=890450.10..2316038.72 rows=1459669 width=72) (actual time=45812.838..89459.319 rows=1454447 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1048355 read=378953 dirtied=1059 written=446 -> Bitmap Heap Scan on lineitem (cost=386856.71..1729371.85 rows=18260476 width=20) (actual time=15285.564..35017.763 rows=18248203 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=792584 read=322254 dirtied=1059 written=446 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382291.59 rows=18260476 width=0) (actual time=14635.649..14635.649 rows=18284460 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=2 read=49813 -> Hash (cost=488560.48..488560.48 rows=1202633 width=60) (actual time=30526.446..30526.446 rows=1194762 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107342kB Buffers: shared hit=255771 read=56699 -> Hash Join (cost=15638.06..488560.48 rows=1202633 width=60) (actual time=1115.867..29045.699 rows=1194762 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=255771 read=56699 -> Seq Scan on orders (cost=0.00..404477.52 rows=15044952 width=8) (actual time=0.012..5381.052 rows=15015000 loops=1) Buffers: shared hit=231917 read=22111 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1115.727..1115.727 rows=119310 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10720kB Buffers: shared hit=23854 read=34588 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=19.923..1034.628 rows=119310 loops=1) Buffers: shared hit=23854 read=34588 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.193..0.391 rows=2 loops=1) Join Filter: (((n1.n_name = 'KENYA'::bpchar) AND (n2.n_name = 'MOROCCO'::bpchar)) OR ((n1.n_name = 'MOROCCO'::bpchar) AND (n2.n_name = 'KENYA'::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=0.022..0.043 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.004 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=25.067..497.479 rows=59655 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23851 read=34588 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=17.396..17.396 rows=59655 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=94.950..94.950 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=0.010..63.967 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 93763.222 ms (53 rows) COMMIT; COMMIT