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 = 'VIETNAM' and n2.n_name = 'MOROCCO') or (n1.n_name = 'MOROCCO' and n2.n_name = 'VIETNAM') ) 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=2378863.73..2380781.55 rows=59010 width=64) (actual time=124933.719..124964.096 rows=4 loops=1) Buffers: shared hit=1160027 read=284021 written=377 -> Sort (cost=2378863.73..2379011.25 rows=59010 width=64) (actual time=124922.790..124931.540 rows=57916 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: 9681kB Buffers: shared hit=1160027 read=284021 written=377 -> Hash Join (cost=902556.18..2374187.58 rows=59010 width=64) (actual time=56992.966..124554.764 rows=57916 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1160019 read=284021 written=377 -> Hash Join (cost=897877.18..2339108.51 rows=1475746 width=72) (actual time=56837.908..120444.654 rows=1456860 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1157837 read=284021 written=377 -> Bitmap Heap Scan on lineitem (cost=388934.16..1746177.05 rows=18461593 width=20) (actual time=18014.016..57913.318 rows=18246268 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=860442 read=266068 written=24 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..384318.76 rows=18461593 width=0) (actual time=17209.442..17209.442 rows=18486721 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=1631 read=48184 written=24 -> Hash (cost=493745.30..493745.30 rows=1215818 width=60) (actual time=38822.496..38822.496 rows=1197420 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107581kB Buffers: shared hit=297395 read=17953 written=353 -> Hash Join (cost=15638.06..493745.30 rows=1215818 width=60) (actual time=1062.327..37274.622 rows=1197420 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=297395 read=17953 written=353 -> Seq Scan on orders (cost=0.00..408911.95 rows=15209895 width=8) (actual time=0.014..8001.330 rows=15015000 loops=1) Buffers: shared hit=252814 read=3999 written=345 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1062.186..1062.186 rows=119831 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10767kB Buffers: shared hit=44581 read=13954 written=8 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=22.286..963.046 rows=119831 loops=1) Buffers: shared hit=44581 read=13954 written=8 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.190..0.375 rows=2 loops=1) Join Filter: (((n1.n_name = 'VIETNAM'::bpchar) AND (n2.n_name = 'MOROCCO'::bpchar)) OR ((n1.n_name = 'MOROCCO'::bpchar) AND (n2.n_name = 'VIETNAM'::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=0.013..0.031 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=0.004..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=27.233..459.742 rows=59916 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=44578 read=13954 written=8 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=18.288..18.288 rows=59916 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=154.192..154.192 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=0.022..108.114 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 124999.171 ms (53 rows) COMMIT; COMMIT