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 = 'MOROCCO' and n2.n_name = 'MOZAMBIQUE') or (n1.n_name = 'MOZAMBIQUE' and n2.n_name = 'MOROCCO') ) 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=2376702.10..2378618.59 rows=58969 width=64) (actual time=89594.688..89625.501 rows=4 loops=1) Buffers: shared hit=782732 read=659961 written=10395 -> Sort (cost=2376702.10..2376849.52 rows=58969 width=64) (actual time=89584.124..89593.979 rows=57653 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: 9644kB Buffers: shared hit=782732 read=659961 written=10395 -> Hash Join (cost=901858.82..2372029.49 rows=58969 width=64) (actual time=42711.451..89235.952 rows=57653 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=782724 read=659961 written=10395 -> Hash Join (cost=897179.82..2336981.51 rows=1474222 width=72) (actual time=42561.512..85573.753 rows=1456169 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=780542 read=659961 written=10395 -> Bitmap Heap Scan on lineitem (cost=388722.78..1744622.76 rows=18442532 width=20) (actual time=15362.297..38627.903 rows=18246498 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=466332 read=659123 written=10365 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..384112.15 rows=18442532 width=0) (actual time=14694.111..14694.111 rows=18466690 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=493274.29..493274.29 rows=1214620 width=60) (actual time=27198.019..27198.019 rows=1195769 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107433kB Buffers: shared hit=314210 read=838 written=30 -> Hash Join (cost=15638.06..493274.29 rows=1214620 width=60) (actual time=431.461..26501.216 rows=1195769 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=314210 read=838 written=30 -> Seq Scan on orders (cost=0.00..408509.11 rows=15194911 width=8) (actual time=0.015..4767.851 rows=15015000 loops=1) Buffers: shared hit=256052 read=508 written=30 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=431.281..431.281 rows=119630 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10749kB Buffers: shared hit=58158 read=330 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=20.134..367.933 rows=119630 loops=1) Buffers: shared hit=58158 read=330 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.215..0.384 rows=2 loops=1) Join Filter: (((n1.n_name = 'MOROCCO'::bpchar) AND (n2.n_name = 'MOZAMBIQUE'::bpchar)) OR ((n1.n_name = 'MOZAMBIQUE'::bpchar) AND (n2.n_name = 'MOROCCO'::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..0.053 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..0.009 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=18.959..168.254 rows=59815 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58155 read=330 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=12.706..12.706 rows=59815 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=4 read=330 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=149.316..149.316 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=0.008..92.113 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 89648.811 ms (53 rows) COMMIT; COMMIT