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 = 'CHINA' and n2.n_name = 'SAUDI ARABIA') or (n1.n_name = 'SAUDI ARABIA' and n2.n_name = 'CHINA') ) 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=2367878.19..2369780.81 rows=58542 width=64) (actual time=148373.330..148399.112 rows=4 loops=1) Buffers: shared hit=1133013 read=306565 written=2571 -> Sort (cost=2367878.19..2368024.55 rows=58542 width=64) (actual time=148364.585..148369.001 rows=58410 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: 9750kB Buffers: shared hit=1133013 read=306565 written=2571 -> Hash Join (cost=898068.82..2363242.49 rows=58542 width=64) (actual time=66619.663..147990.389 rows=58410 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1133005 read=306565 written=2571 -> Hash Join (cost=893389.82..2328409.30 rows=1463803 width=72) (actual time=66471.190..144052.239 rows=1456237 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1130823 read=306565 written=2571 -> Bitmap Heap Scan on lineitem (cost=386390.72..1738101.48 rows=18312184 width=20) (actual time=19678.841..72765.327 rows=18227889 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=822401 read=300825 written=2568 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..381812.67 rows=18312184 width=0) (actual time=18715.669..18715.669 rows=18429686 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=2040 read=47775 written=2514 -> Hash (cost=491861.27..491861.27 rows=1211027 width=60) (actual time=46791.148..46791.148 rows=1197775 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107613kB Buffers: shared hit=308422 read=5740 written=3 -> Hash Join (cost=15638.06..491861.27 rows=1211027 width=60) (actual time=1670.102..45767.890 rows=1197775 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=308422 read=5740 written=3 -> Seq Scan on orders (cost=0.00..407300.59 rows=15149959 width=8) (actual time=0.021..10722.550 rows=15000000 loops=1) Buffers: shared hit=250425 read=5376 written=2 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1669.895..1669.895 rows=119868 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10770kB Buffers: shared hit=57997 read=364 written=1 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=43.286..1566.531 rows=119868 loops=1) Buffers: shared hit=57997 read=364 written=1 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.376..0.526 rows=2 loops=1) Join Filter: (((n1.n_name = 'CHINA'::bpchar) AND (n2.n_name = 'SAUDI ARABIA'::bpchar)) OR ((n1.n_name = 'SAUDI ARABIA'::bpchar) AND (n2.n_name = 'CHINA'::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=0.018..0.046 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.002..0.006 rows=25 loops=25) Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.040..0.042 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=45.691..758.857 rows=59934 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=57994 read=364 written=1 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=36.588..36.588 rows=59934 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=333 written=1 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=145.961..145.961 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=0.011..96.851 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 148431.601 ms (53 rows) COMMIT; COMMIT