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 = 'BRAZIL' and n2.n_name = 'MOZAMBIQUE') or (n1.n_name = 'MOZAMBIQUE' and n2.n_name = 'BRAZIL') ) 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=2371506.00..2373414.34 rows=58718 width=64) (actual time=81531.959..81557.438 rows=4 loops=1) Buffers: shared hit=290962 read=1148999 written=140 -> Sort (cost=2371506.00..2371652.80 rows=58718 width=64) (actual time=81522.328..81529.198 rows=57964 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: 9688kB Buffers: shared hit=290962 read=1148999 written=140 -> Hash Join (cost=900059.19..2366855.09 rows=58718 width=64) (actual time=42960.531..81219.419 rows=57964 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=290954 read=1148999 written=140 -> Hash Join (cost=895380.19..2331903.78 rows=1469577 width=72) (actual time=42881.029..78298.362 rows=1459411 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=288772 read=1148999 written=140 -> Bitmap Heap Scan on lineitem (cost=387895.10..1740781.36 rows=18384417 width=20) (actual time=13548.470..29819.136 rows=18228283 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=45380 read=1077938 written=129 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383299.00 rows=18384417 width=0) (actual time=12929.261..12929.261 rows=18429779 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 written=129 -> Hash (cost=492332.28..492332.28 rows=1212225 width=60) (actual time=29331.660..29331.660 rows=1199137 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107735kB Buffers: shared hit=243392 read=71061 written=11 -> Hash Join (cost=15638.06..492332.28 rows=1212225 width=60) (actual time=465.810..28535.755 rows=1199137 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=243392 read=71061 written=11 -> Seq Scan on orders (cost=0.00..407703.43 rows=15164943 width=8) (actual time=0.018..4171.015 rows=15000000 loops=1) Buffers: shared hit=185159 read=70895 written=11 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=465.669..465.669 rows=119748 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10759kB Buffers: shared hit=58233 read=166 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=17.053..396.163 rows=119748 loops=1) Buffers: shared hit=58233 read=166 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.125..0.373 rows=2 loops=1) Join Filter: (((n1.n_name = 'BRAZIL'::bpchar) AND (n2.n_name = 'MOZAMBIQUE'::bpchar)) OR ((n1.n_name = 'MOZAMBIQUE'::bpchar) AND (n2.n_name = 'BRAZIL'::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=0.033..0.054 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=0.006..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=19.617..181.182 rows=59874 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58230 read=166 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=12.913..12.913 rows=59874 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=168 read=166 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=77.475..77.475 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..49.826 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 81583.545 ms (53 rows) COMMIT; COMMIT