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 = 'IRAQ') or (n1.n_name = 'IRAQ' 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=2363951.31..2365855.91 rows=58603 width=64) (actual time=125925.552..125958.234 rows=4 loops=1) Buffers: shared hit=1045788 read=388913 written=905 -> Sort (cost=2363951.31..2364097.82 rows=58603 width=64) (actual time=125914.118..125924.066 rows=59234 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: 9866kB Buffers: shared hit=1045788 read=388913 written=905 -> Hash Join (cost=897845.17..2359310.33 rows=58603 width=64) (actual time=63844.551..125626.266 rows=59234 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1045780 read=388913 written=905 -> Hash Join (cost=893166.17..2324441.27 rows=1465551 width=72) (actual time=63658.181..121821.354 rows=1470726 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1043598 read=388913 written=905 -> Bitmap Heap Scan on lineitem (cost=387626.92..1735493.79 rows=18334058 width=20) (actual time=18728.858..51642.870 rows=18247310 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=751012 read=368058 written=319 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383043.41 rows=18334058 width=0) (actual time=17937.271..17937.271 rows=18356292 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=1 read=49814 -> Hash (cost=490446.39..490446.39 rows=1207429 width=60) (actual time=44928.328..44928.328 rows=1208037 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108535kB Buffers: shared hit=292586 read=20855 written=586 -> Hash Join (cost=15638.06..490446.39 rows=1207429 width=60) (actual time=627.051..43784.318 rows=1208037 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=292586 read=20855 written=586 -> Seq Scan on orders (cost=0.00..406090.48 rows=15104948 width=8) (actual time=0.016..10959.341 rows=15015000 loops=1) Buffers: shared hit=234520 read=20521 written=586 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=626.867..626.867 rows=120121 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10793kB Buffers: shared hit=58066 read=334 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=21.552..565.250 rows=120121 loops=1) Buffers: shared hit=58066 read=334 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.161..0.334 rows=2 loops=1) Join Filter: (((n1.n_name = 'CHINA'::bpchar) AND (n2.n_name = 'IRAQ'::bpchar)) OR ((n1.n_name = 'IRAQ'::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=0.014..0.031 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..0.011 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=21.515..268.035 rows=60060 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58063 read=334 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=14.254..14.254 rows=60060 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=334 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=185.919..185.919 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=0.016..137.791 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 125991.111 ms (53 rows) COMMIT; COMMIT