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 = 'ETHIOPIA' and n2.n_name = 'FRANCE') or (n1.n_name = 'FRANCE' and n2.n_name = 'ETHIOPIA') ) 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=2380943.30..2382863.56 rows=59085 width=64) (actual time=91060.902..91084.879 rows=4 loops=1) Buffers: shared hit=815393 read=630021 written=7823 -> Sort (cost=2380943.30..2381091.01 rows=59085 width=64) (actual time=91052.138..91057.908 rows=58170 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: 9717kB Buffers: shared hit=815393 read=630021 written=7823 -> Hash Join (cost=903202.12..2376260.66 rows=59085 width=64) (actual time=48001.326..90775.301 rows=58170 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=815385 read=630021 written=7823 -> Hash Join (cost=898523.12..2341153.03 rows=1477118 width=72) (actual time=47868.692..87324.234 rows=1468087 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=813203 read=630021 written=7823 -> Bitmap Heap Scan on lineitem (cost=389094.11..1747657.49 rows=18478759 width=20) (actual time=16060.077..33684.999 rows=18246713 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=534203 read=593367 written=7742 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..384474.42 rows=18478759 width=0) (actual time=15264.347..15264.347 rows=18503145 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 written=7 -> Hash (cost=494216.31..494216.31 rows=1217016 width=60) (actual time=31807.621..31807.621 rows=1210975 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108799kB Buffers: shared hit=279000 read=36654 written=81 -> Hash Join (cost=15638.06..494216.31 rows=1217016 width=60) (actual time=1291.505..30467.513 rows=1210975 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=279000 read=36654 written=81 -> Seq Scan on orders (cost=0.00..409314.79 rows=15224879 width=8) (actual time=0.014..5728.899 rows=15015000 loops=1) Buffers: shared hit=255010 read=2056 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1291.319..1291.319 rows=120787 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10852kB Buffers: shared hit=23990 read=34598 written=81 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=21.374..1186.021 rows=120787 loops=1) Buffers: shared hit=23990 read=34598 written=81 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.141..0.472 rows=2 loops=1) Join Filter: (((n1.n_name = 'ETHIOPIA'::bpchar) AND (n2.n_name = 'FRANCE'::bpchar)) OR ((n1.n_name = 'FRANCE'::bpchar) AND (n2.n_name = 'ETHIOPIA'::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=0.027..0.052 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..0.011 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=26.097..568.846 rows=60394 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23987 read=34598 written=81 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=17.660..17.660 rows=60394 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=335 written=1 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=132.289..132.289 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=0.013..83.746 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 91131.065 ms (53 rows) COMMIT; COMMIT