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 = 'KENYA' and n2.n_name = 'JORDAN') or (n1.n_name = 'JORDAN' and n2.n_name = 'KENYA') ) 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=2359109.69..2361010.52 rows=58487 width=64) (actual time=84133.334..84166.558 rows=4 loops=1) Buffers: shared hit=612439 read=818332 written=7709 -> Sort (cost=2359109.69..2359255.91 rows=58487 width=64) (actual time=84122.724..84133.277 rows=58577 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: 9774kB Buffers: shared hit=612439 read=818332 written=7709 -> Hash Join (cost=896593.27..2354478.74 rows=58487 width=64) (actual time=44653.167..83855.779 rows=58577 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=612431 read=818332 written=7709 -> Hash Join (cost=891914.27..2319640.73 rows=1464085 width=72) (actual time=44526.738..80402.787 rows=1456064 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=610249 read=818332 written=7709 -> Bitmap Heap Scan on lineitem (cost=387834.89..1732236.58 rows=18315713 width=20) (actual time=14121.636..31766.916 rows=18229496 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=352808 read=763083 written=1270 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383255.96 rows=18315713 width=0) (actual time=13353.824..13353.824 rows=18310449 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=6479 read=43336 written=1236 -> Hash (cost=489031.49..489031.49 rows=1203831 width=60) (actual time=30404.435..30404.435 rows=1198434 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107672kB Buffers: shared hit=257441 read=55249 written=6439 -> Hash Join (cost=15638.06..489031.49 rows=1203831 width=60) (actual time=1120.794..29655.962 rows=1198434 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=257441 read=55249 written=6439 -> Seq Scan on orders (cost=0.00..404880.36 rows=15059936 width=8) (actual time=0.016..5043.381 rows=15000000 loops=1) Buffers: shared hit=233597 read=20684 written=570 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1120.651..1120.651 rows=119385 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10726kB Buffers: shared hit=23844 read=34565 written=5869 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=19.360..968.474 rows=119385 loops=1) Buffers: shared hit=23844 read=34565 written=5869 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.218..0.430 rows=2 loops=1) Join Filter: (((n1.n_name = 'KENYA'::bpchar) AND (n2.n_name = 'JORDAN'::bpchar)) OR ((n1.n_name = 'JORDAN'::bpchar) AND (n2.n_name = 'KENYA'::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=0.050..0.070 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.000..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..0.009 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=25.486..463.460 rows=59692 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23841 read=34565 written=5869 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=17.381..17.381 rows=59692 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=331 written=42 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=125.653..125.653 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=0.015..81.667 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 84199.002 ms (53 rows) COMMIT; COMMIT