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 = 'FRANCE' and n2.n_name = 'UNITED STATES') or (n1.n_name = 'UNITED STATES' and n2.n_name = 'FRANCE') ) 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=2359245.82..2361142.85 rows=58370 width=64) (actual time=87164.065..87189.575 rows=4 loops=1) Buffers: shared hit=1056267 read=377342 written=1649 -> Sort (cost=2359245.82..2359391.75 rows=58370 width=64) (actual time=87154.907..87160.554 rows=57792 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: 9664kB Buffers: shared hit=1056267 read=377342 written=1649 -> Hash Join (cost=895886.29..2354624.98 rows=58370 width=64) (actual time=45430.746..86812.368 rows=57792 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1056259 read=377342 written=1649 -> Hash Join (cost=891207.29..2319885.27 rows=1459258 width=72) (actual time=45349.766..83327.816 rows=1464918 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1054077 read=377342 written=1649 -> Bitmap Heap Scan on lineitem (cost=386155.94..1731783.86 rows=18255328 width=20) (actual time=16282.341..32382.284 rows=18247594 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=747607 read=370408 written=1644 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..381592.11 rows=18255328 width=0) (actual time=15659.915..15659.915 rows=18338343 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 -> Hash (cost=489973.51..489973.51 rows=1206227 width=60) (actual time=29066.777..29066.777 rows=1207105 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108451kB Buffers: shared hit=306470 read=6934 written=5 -> Hash Join (cost=15638.06..489973.51 rows=1206227 width=60) (actual time=722.868..26661.095 rows=1207105 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=306470 read=6934 written=5 -> Seq Scan on orders (cost=0.00..405686.04 rows=15089904 width=8) (actual time=0.013..5071.150 rows=15015000 loops=1) Buffers: shared hit=248188 read=6599 written=5 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=722.741..722.741 rows=120322 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10811kB Buffers: shared hit=58282 read=335 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=19.933..637.142 rows=120322 loops=1) Buffers: shared hit=58282 read=335 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.150..0.471 rows=2 loops=1) Join Filter: (((n1.n_name = 'FRANCE'::bpchar) AND (n2.n_name = 'UNITED STATES'::bpchar)) OR ((n1.n_name = 'UNITED STATES'::bpchar) AND (n2.n_name = 'FRANCE'::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=0.036..0.053 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..0.008 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=28.872..297.995 rows=60161 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58279 read=335 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=19.527..19.527 rows=60161 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=335 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=79.968..79.968 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..51.236 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 87224.571 ms (53 rows) COMMIT; COMMIT