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 = 'MOZAMBIQUE' and n2.n_name = 'EGYPT') or (n1.n_name = 'EGYPT' and n2.n_name = 'MOZAMBIQUE') ) 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=2371874.85..2373787.02 rows=58836 width=64) (actual time=85823.065..85847.695 rows=4 loops=1) Buffers: shared hit=1016723 read=422043 written=284 -> Sort (cost=2371874.85..2372021.94 rows=58836 width=64) (actual time=85814.347..85818.658 rows=57648 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: 9643kB Buffers: shared hit=1016723 read=422043 written=284 -> Hash Join (cost=900632.74..2367213.74 rows=58836 width=64) (actual time=43596.188..85459.955 rows=57648 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1016715 read=422043 written=284 -> Hash Join (cost=895953.74..2332195.86 rows=1472817 width=72) (actual time=43517.323..82050.351 rows=1459650 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1014533 read=422043 written=284 -> Bitmap Heap Scan on lineitem (cost=388954.64..1741374.99 rows=18424957 width=20) (actual time=14141.416..30420.573 rows=18246199 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=708937 read=413312 written=280 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..384348.40 rows=18424957 width=0) (actual time=13450.224..13450.224 rows=18410988 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=5 read=49810 written=10 -> Hash (cost=491861.27..491861.27 rows=1211027 width=60) (actual time=29374.958..29374.958 rows=1198756 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107701kB Buffers: shared hit=305596 read=8731 written=4 -> Hash Join (cost=15638.06..491861.27 rows=1211027 width=60) (actual time=548.086..28440.556 rows=1198756 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=305596 read=8731 written=4 -> Seq Scan on orders (cost=0.00..407300.59 rows=15149959 width=8) (actual time=0.013..5006.256 rows=15015000 loops=1) Buffers: shared hit=247401 read=8400 written=1 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=547.919..547.919 rows=119765 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10761kB Buffers: shared hit=58195 read=331 written=3 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=19.473..468.508 rows=119765 loops=1) Buffers: shared hit=58195 read=331 written=3 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.120..0.440 rows=2 loops=1) Join Filter: (((n1.n_name = 'MOZAMBIQUE'::bpchar) AND (n2.n_name = 'EGYPT'::bpchar)) OR ((n1.n_name = 'EGYPT'::bpchar) AND (n2.n_name = 'MOZAMBIQUE'::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..0.039 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=0.005..0.009 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=24.073..215.253 rows=59882 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58192 read=331 written=3 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=16.098..16.098 rows=59882 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=3 read=331 written=3 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=75.914..75.914 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=0.009..49.069 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 85877.349 ms (53 rows) COMMIT; COMMIT