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=2368271.97..2370183.98 rows=58831 width=64) (actual time=85726.188..85758.100 rows=4 loops=1) Buffers: shared hit=324475 read=1111180 written=2846 -> Sort (cost=2368271.97..2368419.05 rows=58831 width=64) (actual time=85715.975..85725.849 rows=58233 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: 9726kB Buffers: shared hit=324475 read=1111180 written=2846 -> Hash Join (cost=899486.61..2363611.29 rows=58831 width=64) (actual time=41864.672..85358.573 rows=58233 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=324467 read=1111180 written=2846 -> Hash Join (cost=894807.61..2328602.57 rows=1472363 width=72) (actual time=41743.361..82151.161 rows=1453607 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=322302 read=1111163 written=2844 -> Bitmap Heap Scan on lineitem (cost=389268.36..1739267.42 rows=18419271 width=20) (actual time=14604.960..33926.998 rows=18228771 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=26911 read=1093011 written=2748 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..384663.54 rows=18419271 width=0) (actual time=13972.081..13972.081 rows=18374452 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=4345 read=45470 written=2748 -> Hash (cost=490446.39..490446.39 rows=1207429 width=60) (actual time=27137.446..27137.446 rows=1198204 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107652kB Buffers: shared hit=295391 read=18152 written=96 -> Hash Join (cost=15638.06..490446.39 rows=1207429 width=60) (actual time=664.357..24434.075 rows=1198204 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=295391 read=18152 written=96 -> Seq Scan on orders (cost=0.00..406090.48 rows=15104948 width=8) (actual time=0.017..4412.986 rows=15000000 loops=1) Buffers: shared hit=246395 read=8646 written=1 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=664.210..664.210 rows=120039 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10785kB Buffers: shared hit=48996 read=9506 written=95 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=26.606..586.402 rows=120039 loops=1) Buffers: shared hit=48996 read=9506 written=95 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.163..0.346 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=0.023..0.041 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=0.007..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=24.184..273.576 rows=60020 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=48993 read=9506 written=95 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=14.464..14.464 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=120.485..120.485 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=2162 read=17 written=2 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.016..71.271 rows=100000 loops=1) Buffers: shared hit=2162 read=17 written=2 Total runtime: 85790.311 ms (53 rows) COMMIT; COMMIT