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 = 'CANADA' and n2.n_name = 'EGYPT') or (n1.n_name = 'EGYPT' and n2.n_name = 'CANADA') ) 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=2357526.75..2359426.21 rows=58445 width=64) (actual time=90006.915..90035.167 rows=4 loops=1) Buffers: shared hit=788247 read=642618 written=2081 -> Sort (cost=2357526.75..2357672.86 rows=58445 width=64) (actual time=89996.652..90003.798 rows=58476 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: 9760kB Buffers: shared hit=788247 read=642618 written=2081 -> Hash Join (cost=895800.40..2352899.43 rows=58445 width=64) (actual time=46720.338..89631.247 rows=58476 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=788239 read=642618 written=2081 -> Hash Join (cost=891121.40..2318121.45 rows=1461115 width=72) (actual time=46586.356..85968.204 rows=1450106 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=786057 read=642618 written=2081 -> Bitmap Heap Scan on lineitem (cost=387042.02..1730886.34 rows=18278555 width=20) (actual time=16576.289..36847.513 rows=18229496 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=482135 read=633756 written=1885 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382472.38 rows=18278555 width=0) (actual time=15836.811..15836.811 rows=18310609 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=5436 read=44379 written=1754 -> Hash (cost=489031.49..489031.49 rows=1203831 width=60) (actual time=30009.147..30009.147 rows=1194890 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107354kB Buffers: shared hit=303922 read=8862 written=196 -> Hash Join (cost=15638.06..489031.49 rows=1203831 width=60) (actual time=800.392..29122.979 rows=1194890 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=303922 read=8862 written=196 -> Seq Scan on orders (cost=0.00..404880.36 rows=15059936 width=8) (actual time=0.019..5364.464 rows=15000000 loops=1) Buffers: shared hit=245586 read=8695 written=176 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=800.198..800.198 rows=119818 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10765kB Buffers: shared hit=58336 read=167 written=20 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=22.066..703.903 rows=119818 loops=1) Buffers: shared hit=58336 read=167 written=20 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.166..0.502 rows=2 loops=1) Join Filter: (((n1.n_name = 'CANADA'::bpchar) AND (n2.n_name = 'EGYPT'::bpchar)) OR ((n1.n_name = 'EGYPT'::bpchar) AND (n2.n_name = 'CANADA'::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=0.028..0.055 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=0.043..0.046 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=23.993..329.077 rows=59909 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58333 read=167 written=20 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=17.378..17.378 rows=59909 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=169 read=165 written=20 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=132.775..132.775 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..86.802 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 90060.350 ms (53 rows) COMMIT; COMMIT