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 = 'VIETNAM' and n2.n_name = 'ALGERIA') or (n1.n_name = 'ALGERIA' and n2.n_name = 'VIETNAM') ) 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=2363371.75..2365276.38 rows=58604 width=64) (actual time=80255.129..80281.527 rows=4 loops=1) Buffers: shared hit=1154147 read=279273 written=187 -> Sort (cost=2363371.75..2363518.26 rows=58604 width=64) (actual time=80245.852..80254.243 rows=57472 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: 9619kB Buffers: shared hit=1154147 read=279273 written=187 -> Hash Join (cost=897939.42..2358730.69 rows=58604 width=64) (actual time=44103.994..79981.690 rows=57472 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1154139 read=279273 written=187 -> Hash Join (cost=893260.42..2323832.57 rows=1467003 width=72) (actual time=43980.966..76889.570 rows=1459746 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1151957 read=279273 written=187 -> Bitmap Heap Scan on lineitem (cost=388209.07..1735290.36 rows=18352219 width=20) (actual time=15562.997..29516.451 rows=18247594 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=850800 read=267215 written=183 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383621.02 rows=18352219 width=0) (actual time=14764.844..14764.844 rows=18338343 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 -> Hash (cost=489973.51..489973.51 rows=1206227 width=60) (actual time=28417.018..28417.018 rows=1199748 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107790kB Buffers: shared hit=301157 read=12058 written=4 -> Hash Join (cost=15638.06..489973.51 rows=1206227 width=60) (actual time=403.916..26732.177 rows=1199748 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=301157 read=12058 written=4 -> Seq Scan on orders (cost=0.00..405686.04 rows=15089904 width=8) (actual time=0.018..5141.126 rows=15015000 loops=1) Buffers: shared hit=243061 read=11726 written=4 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=403.778..403.778 rows=119913 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10774kB Buffers: shared hit=58096 read=332 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=19.304..358.272 rows=119913 loops=1) Buffers: shared hit=58096 read=332 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.085..0.347 rows=2 loops=1) Join Filter: (((n1.n_name = 'VIETNAM'::bpchar) AND (n2.n_name = 'ALGERIA'::bpchar)) OR ((n1.n_name = 'ALGERIA'::bpchar) AND (n2.n_name = 'VIETNAM'::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=0.020..0.045 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..0.010 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=18.685..166.185 rows=59956 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58093 read=332 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=12.573..12.573 rows=59956 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=332 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=122.262..122.262 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=0.021..76.711 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 80312.815 ms (53 rows) COMMIT; COMMIT