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 = 'SAUDI ARABIA' and n2.n_name = 'INDONESIA') or (n1.n_name = 'INDONESIA' and n2.n_name = 'SAUDI ARABIA') ) 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=2378306.08..2380226.48 rows=59089 width=64) (actual time=106234.224..106268.919 rows=4 loops=1) Buffers: shared hit=715328 read=727379 written=14474 -> Sort (cost=2378306.08..2378453.81 rows=59089 width=64) (actual time=106220.937..106233.737 rows=58319 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: 9738kB Buffers: shared hit=715328 read=727379 written=14474 -> Hash Join (cost=902655.97..2373623.10 rows=59089 width=64) (actual time=46963.451..105765.358 rows=58319 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=715320 read=727379 written=14474 -> Hash Join (cost=897976.97..2338513.25 rows=1477226 width=72) (actual time=46838.056..101753.352 rows=1454646 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=713138 read=727379 written=14474 -> Bitmap Heap Scan on lineitem (cost=389519.94..1745983.56 rows=18480108 width=20) (actual time=17063.517..48496.360 rows=18246498 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=398429 read=727026 written=14474 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..384899.91 rows=18480108 width=0) (actual time=16369.119..16369.119 rows=18466690 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 written=2 -> Hash (cost=493274.29..493274.29 rows=1214620 width=60) (actual time=29773.465..29773.465 rows=1199456 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107764kB Buffers: shared hit=314709 read=353 -> Hash Join (cost=15638.06..493274.29 rows=1214620 width=60) (actual time=588.519..28111.707 rows=1199456 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=314709 read=353 -> Seq Scan on orders (cost=0.00..408509.11 rows=15194911 width=8) (actual time=0.660..4858.183 rows=15015000 loops=1) Buffers: shared hit=256541 read=19 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=587.705..587.705 rows=120039 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10785kB Buffers: shared hit=58168 read=334 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=27.355..501.055 rows=120039 loops=1) Buffers: shared hit=58168 read=334 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.171..0.437 rows=2 loops=1) Join Filter: (((n1.n_name = 'SAUDI ARABIA'::bpchar) AND (n2.n_name = 'INDONESIA'::bpchar)) OR ((n1.n_name = 'INDONESIA'::bpchar) AND (n2.n_name = 'SAUDI ARABIA'::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=0.027..0.052 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=0.004..0.008 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=30.080..230.334 rows=60020 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=20.722..20.722 rows=60020 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=124.539..124.539 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..80.811 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 106310.019 ms (53 rows) COMMIT; COMMIT