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 = 'JORDAN' and n2.n_name = 'MOROCCO') or (n1.n_name = 'MOROCCO' and n2.n_name = 'JORDAN') ) 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=2347255.78..2349139.77 rows=57969 width=64) (actual time=160687.228..160713.141 rows=4 loops=1) Buffers: shared hit=653735 read=773185 written=4108 -> Sort (cost=2347255.78..2347400.70 rows=57969 width=64) (actual time=160677.950..160682.676 rows=57378 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: 9605kB Buffers: shared hit=653735 read=773185 written=4108 -> Hash Join (cost=891852.03..2342669.56 rows=57969 width=64) (actual time=81070.144..160325.404 rows=57378 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=653727 read=773185 written=4108 -> Hash Join (cost=887173.03..2308131.83 rows=1449460 width=72) (actual time=80921.362..156369.756 rows=1454129 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=651618 read=773112 written=4108 -> Bitmap Heap Scan on lineitem (cost=384551.59..1723017.94 rows=18132757 width=20) (actual time=17316.893..68089.655 rows=18230193 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=563580 read=549131 written=1238 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..380018.40 rows=18132757 width=0) (actual time=16658.154..16658.154 rows=18251029 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=18133 read=31682 written=1217 -> Hash (cost=487618.47..487618.47 rows=1200238 width=60) (actual time=63603.169..63603.169 rows=1197476 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107586kB Buffers: shared hit=88038 read=223981 written=2870 -> Hash Join (cost=15638.06..487618.47 rows=1200238 width=60) (actual time=1485.059..59713.640 rows=1197476 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=88038 read=223981 written=2870 -> Seq Scan on orders (cost=0.00..403671.84 rows=15014984 width=8) (actual time=0.014..23458.813 rows=15000000 loops=1) Buffers: shared hit=29873 read=223649 written=2852 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1484.874..1484.874 rows=119743 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10759kB Buffers: shared hit=58165 read=332 written=18 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=48.841..1389.196 rows=119743 loops=1) Buffers: shared hit=58165 read=332 written=18 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.180..0.420 rows=2 loops=1) Join Filter: (((n1.n_name = 'JORDAN'::bpchar) AND (n2.n_name = 'MOROCCO'::bpchar)) OR ((n1.n_name = 'MOROCCO'::bpchar) AND (n2.n_name = 'JORDAN'::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=0.012..0.034 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=42.934..672.449 rows=59872 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58162 read=332 written=18 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=31.951..31.951 rows=59872 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=3 read=332 written=18 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=148.521..148.521 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=2106 read=73 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.008..105.902 rows=100000 loops=1) Buffers: shared hit=2106 read=73 Total runtime: 160742.883 ms (53 rows) COMMIT; COMMIT