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 = 'MOZAMBIQUE' and n2.n_name = 'CHINA') or (n1.n_name = 'CHINA' and n2.n_name = 'MOZAMBIQUE') ) 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=2362118.87..2364015.99 rows=58373 width=64) (actual time=144492.245..144522.724 rows=4 loops=1) Buffers: shared hit=1175006 read=261032 dirtied=66 written=866 -> Sort (cost=2362118.87..2362264.80 rows=58373 width=64) (actual time=144481.765..144490.239 rows=57890 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: 9677kB Buffers: shared hit=1175006 read=261032 dirtied=66 written=866 -> Hash Join (cost=896554.88..2357497.76 rows=58373 width=64) (actual time=69510.479..144111.060 rows=57890 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1174998 read=261032 dirtied=66 written=866 -> Hash Join (cost=891875.88..2322751.65 rows=1459576 width=72) (actual time=69339.802..139960.088 rows=1463502 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1172816 read=261032 dirtied=66 written=866 -> Bitmap Heap Scan on lineitem (cost=385848.73..1733656.33 rows=18259307 width=20) (actual time=21201.286..69153.122 rows=18247062 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=887591 read=232538 dirtied=66 written=820 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..381283.90 rows=18259307 width=0) (actual time=20449.243..20449.243 rows=18374583 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=490919.26..490919.26 rows=1208632 width=60) (actual time=48137.328..48137.328 rows=1202205 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108011kB Buffers: shared hit=285225 read=28494 written=46 -> Hash Join (cost=15638.06..490919.26 rows=1208632 width=60) (actual time=3035.216..47136.152 rows=1202205 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=285225 read=28494 written=46 -> Seq Scan on orders (cost=0.00..406494.91 rows=15119991 width=8) (actual time=0.023..10657.610 rows=15015000 loops=1) Buffers: shared hit=253455 read=1840 written=19 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=3035.002..3035.002 rows=119861 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10769kB Buffers: shared hit=31770 read=26654 written=27 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=50.910..2922.293 rows=119861 loops=1) Buffers: shared hit=31770 read=26654 written=27 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.231..0.406 rows=2 loops=1) Join Filter: (((n1.n_name = 'MOZAMBIQUE'::bpchar) AND (n2.n_name = 'CHINA'::bpchar)) OR ((n1.n_name = 'CHINA'::bpchar) AND (n2.n_name = 'MOZAMBIQUE'::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=0.023..0.048 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=0.007..0.010 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=45.190..1434.601 rows=59930 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=31767 read=26654 written=27 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=34.506..34.506 rows=59930 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=333 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=169.127..169.127 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..122.945 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 144551.953 ms (53 rows) COMMIT; COMMIT