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 = 'INDIA' and n2.n_name = 'GERMANY') or (n1.n_name = 'GERMANY' and n2.n_name = 'INDIA') ) 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=2356991.11..2358890.09 rows=58430 width=64) (actual time=82526.631..82555.555 rows=4 loops=1) Buffers: shared hit=804053 read=625468 written=51 -> Sort (cost=2356991.11..2357137.19 rows=58430 width=64) (actual time=82516.636..82523.773 rows=59170 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: 9857kB Buffers: shared hit=804053 read=625468 written=51 -> Hash Join (cost=895921.59..2352365.09 rows=58430 width=64) (actual time=42260.302..82236.290 rows=59170 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=804045 read=625468 written=51 -> Hash Join (cost=891242.59..2317556.90 rows=1462637 width=72) (actual time=42162.273..78928.677 rows=1466238 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=801873 read=625458 written=51 -> Bitmap Heap Scan on lineitem (cost=387649.20..1730721.15 rows=18297597 width=20) (actual time=16544.388..34171.006 rows=18248203 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=499636 read=615202 written=51 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383074.80 rows=18297597 width=0) (actual time=15714.354..15714.354 rows=18284460 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=4 read=49811 written=45 -> Hash (cost=488560.48..488560.48 rows=1202633 width=60) (actual time=25616.804..25616.804 rows=1203543 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108131kB Buffers: shared hit=302237 read=10256 -> Hash Join (cost=15638.06..488560.48 rows=1202633 width=60) (actual time=747.077..23670.510 rows=1203543 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=302237 read=10256 -> Seq Scan on orders (cost=0.00..404477.52 rows=15044952 width=8) (actual time=0.016..4699.185 rows=15015000 loops=1) Buffers: shared hit=252040 read=1988 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=746.867..746.867 rows=120368 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10815kB Buffers: shared hit=50197 read=8268 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=21.192..642.555 rows=120368 loops=1) Buffers: shared hit=50197 read=8268 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.148..0.447 rows=2 loops=1) Join Filter: (((n1.n_name = 'INDIA'::bpchar) AND (n2.n_name = 'GERMANY'::bpchar)) OR ((n1.n_name = 'GERMANY'::bpchar) AND (n2.n_name = 'INDIA'::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=0.021..0.043 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.005 rows=25 loops=25) Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.007..0.012 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=26.668..298.672 rows=60184 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=50194 read=8268 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=17.953..17.953 rows=60184 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=96.463..96.463 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=2169 read=10 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.014..62.982 rows=100000 loops=1) Buffers: shared hit=2169 read=10 Total runtime: 82581.215 ms (53 rows) COMMIT; COMMIT