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 = 'IRAQ' and n2.n_name = 'EGYPT') or (n1.n_name = 'EGYPT' and n2.n_name = 'IRAQ') ) 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=2374148.41..2376058.67 rows=58777 width=64) (actual time=90586.601..90618.124 rows=4 loops=1) Buffers: shared hit=655606 read=787101 written=11559 -> Sort (cost=2374148.41..2374295.36 rows=58777 width=64) (actual time=90575.461..90585.055 rows=59327 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: 9879kB Buffers: shared hit=655606 read=787101 written=11559 -> Hash Join (cost=900595.06..2369492.40 rows=58777 width=64) (actual time=40954.318..90198.531 rows=59327 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=655598 read=787101 written=11559 -> Hash Join (cost=895916.06..2334543.35 rows=1469420 width=72) (actual time=40833.913..86847.213 rows=1466684 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=653416 read=787101 written=11559 -> Bitmap Heap Scan on lineitem (cost=387459.02..1742457.89 rows=18382458 width=20) (actual time=13703.647..39004.746 rows=18246498 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=339869 read=785586 written=11559 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382863.41 rows=18382458 width=0) (actual time=13117.320..13117.320 rows=18466690 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 -> Hash (cost=493274.29..493274.29 rows=1214620 width=60) (actual time=27129.296..27129.296 rows=1204505 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108218kB Buffers: shared hit=313547 read=1515 -> Hash Join (cost=15638.06..493274.29 rows=1214620 width=60) (actual time=445.892..26285.941 rows=1204505 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=313547 read=1515 -> Seq Scan on orders (cost=0.00..408509.11 rows=15194911 width=8) (actual time=0.017..4481.920 rows=15015000 loops=1) Buffers: shared hit=255379 read=1181 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=445.728..445.728 rows=120025 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10784kB Buffers: shared hit=58168 read=334 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=21.691..386.876 rows=120025 loops=1) Buffers: shared hit=58168 read=334 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.099..0.350 rows=2 loops=1) Join Filter: (((n1.n_name = 'IRAQ'::bpchar) AND (n2.n_name = 'EGYPT'::bpchar)) OR ((n1.n_name = 'EGYPT'::bpchar) AND (n2.n_name = 'IRAQ'::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=0.010..0.027 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=0.004..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=26.038..177.964 rows=60012 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58165 read=334 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=17.426..17.426 rows=60012 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=119.147..119.147 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=0.042..73.479 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 90640.015 ms (53 rows) COMMIT; COMMIT