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 = 'MOROCCO') or (n1.n_name = 'MOROCCO' 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=2364831.60..2366740.19 rows=58726 width=64) (actual time=79209.633..79241.542 rows=4 loops=1) Buffers: shared hit=479142 read=954291 written=34472 -> Sort (cost=2364831.60..2364978.41 rows=58726 width=64) (actual time=79197.945..79207.935 rows=58519 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: 9766kB Buffers: shared hit=479142 read=954291 written=34472 -> Hash Join (cost=898662.52..2360180.00 rows=58726 width=64) (actual time=38710.431..78632.113 rows=58519 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=479134 read=954291 written=34472 -> Hash Join (cost=893983.52..2325225.29 rows=1469741 width=72) (actual time=38644.307..75650.506 rows=1457509 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=476952 read=954291 written=34472 -> Bitmap Heap Scan on lineitem (cost=388932.17..1736527.25 rows=18386472 width=20) (actual time=12940.132..29738.387 rows=18247594 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=186936 read=931079 written=34472 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..384335.55 rows=18386472 width=0) (actual time=12255.254..12255.254 rows=18338343 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=24929 read=24886 -> Hash (cost=489973.51..489973.51 rows=1206227 width=60) (actual time=25703.267..25703.267 rows=1198522 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107680kB Buffers: shared hit=290016 read=23212 -> Hash Join (cost=15638.06..489973.51 rows=1206227 width=60) (actual time=906.201..24421.669 rows=1198522 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=290016 read=23212 -> Seq Scan on orders (cost=0.00..405686.04 rows=15089904 width=8) (actual time=0.016..4485.262 rows=15015000 loops=1) Buffers: shared hit=254583 read=204 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=906.057..906.057 rows=119786 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10763kB Buffers: shared hit=35433 read=23008 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=17.625..600.358 rows=119786 loops=1) Buffers: shared hit=35433 read=23008 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.115..0.353 rows=2 loops=1) Join Filter: (((n1.n_name = 'BRAZIL'::bpchar) AND (n2.n_name = 'MOROCCO'::bpchar)) OR ((n1.n_name = 'MOROCCO'::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=0.026..0.042 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=0.008..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=20.681..283.800 rows=59893 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=35430 read=23008 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=13.819..13.819 rows=59893 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=65.826..65.826 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..39.667 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 79281.275 ms (53 rows) COMMIT; COMMIT