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 = 'EGYPT' and n2.n_name = 'ETHIOPIA') or (n1.n_name = 'ETHIOPIA' and n2.n_name = 'EGYPT') ) 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=2363905.79..2365810.91 rows=58619 width=64) (actual time=99367.217..99396.863 rows=4 loops=1) Buffers: shared hit=373510 read=1061427 written=1337 -> Sort (cost=2363905.79..2364052.34 rows=58619 width=64) (actual time=99357.177..99365.993 rows=58346 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: 9741kB Buffers: shared hit=373510 read=1061427 written=1337 -> Hash Join (cost=897819.00..2359263.44 rows=58619 width=64) (actual time=50955.527..98981.112 rows=58346 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=373502 read=1061427 written=1337 -> Hash Join (cost=893140.00..2324395.71 rows=1465472 width=72) (actual time=50805.502..95233.836 rows=1466241 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=371342 read=1061405 written=1337 -> Bitmap Heap Scan on lineitem (cost=387600.76..1735452.75 rows=18333066 width=20) (actual time=16457.439..39510.253 rows=18247310 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=82316 read=1036754 written=635 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383017.49 rows=18333066 width=0) (actual time=15842.715..15842.715 rows=18356292 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=3 read=49812 written=5 -> Hash (cost=490446.39..490446.39 rows=1207429 width=60) (actual time=34347.344..34347.344 rows=1206196 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108370kB Buffers: shared hit=289026 read=24651 written=702 -> Hash Join (cost=15638.06..490446.39 rows=1207429 width=60) (actual time=624.126..33354.669 rows=1206196 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=289026 read=24651 written=702 -> Seq Scan on orders (cost=0.00..406090.48 rows=15104948 width=8) (actual time=0.012..6069.232 rows=15015000 loops=1) Buffers: shared hit=230779 read=24262 written=702 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=623.957..623.957 rows=120440 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10821kB Buffers: shared hit=58247 read=389 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=20.593..526.352 rows=120440 loops=1) Buffers: shared hit=58247 read=389 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.109..0.439 rows=2 loops=1) Join Filter: (((n1.n_name = 'EGYPT'::bpchar) AND (n2.n_name = 'ETHIOPIA'::bpchar)) OR ((n1.n_name = 'ETHIOPIA'::bpchar) AND (n2.n_name = 'EGYPT'::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=0.022..0.045 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.004 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=31.962..242.346 rows=60220 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58244 read=389 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=21.615..21.615 rows=60220 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=3 read=333 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=148.813..148.813 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=2157 read=22 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.015..98.484 rows=100000 loops=1) Buffers: shared hit=2157 read=22 Total runtime: 99427.949 ms (53 rows) COMMIT; COMMIT