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 = 'IRAQ' and n2.n_name = 'ETHIOPIA') or (n1.n_name = 'ETHIOPIA' and n2.n_name = 'IRAQ') ) 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=2355454.61..2357351.67 rows=58371 width=64) (actual time=127269.215..127297.324 rows=4 loops=1) Buffers: shared hit=1156388 read=273200 dirtied=214 written=173 -> Sort (cost=2355454.61..2355600.54 rows=58371 width=64) (actual time=127260.039..127264.328 rows=59109 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: 9849kB Buffers: shared hit=1156388 read=273200 dirtied=214 written=173 -> Hash Join (cost=895155.23..2350833.68 rows=58371 width=64) (actual time=61310.010..126926.723 rows=59109 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1156380 read=273200 dirtied=214 written=173 -> Hash Join (cost=890476.23..2316084.16 rows=1459748 width=72) (actual time=61143.503..123189.986 rows=1473022 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1154198 read=273200 dirtied=214 written=173 -> Bitmap Heap Scan on lineitem (cost=386882.84..1729412.80 rows=18261464 width=20) (actual time=17670.687..53270.386 rows=18248203 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=861451 read=253387 dirtied=214 written=173 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382317.47 rows=18261464 width=0) (actual time=16889.452..16889.452 rows=18284460 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=1984 read=47831 -> Hash (cost=488560.48..488560.48 rows=1202633 width=60) (actual time=43471.642..43471.642 rows=1210766 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108780kB Buffers: shared hit=292747 read=19813 -> Hash Join (cost=15638.06..488560.48 rows=1202633 width=60) (actual time=1291.421..40326.840 rows=1210766 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=292747 read=19813 -> Seq Scan on orders (cost=0.00..404477.52 rows=15044952 width=8) (actual time=0.016..9061.197 rows=15015000 loops=1) Buffers: shared hit=234551 read=19477 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1291.214..1291.214 rows=120527 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10829kB Buffers: shared hit=58196 read=336 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=40.333..1189.899 rows=120527 loops=1) Buffers: shared hit=58196 read=336 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.139..0.463 rows=2 loops=1) Join Filter: (((n1.n_name = 'IRAQ'::bpchar) AND (n2.n_name = 'ETHIOPIA'::bpchar)) OR ((n1.n_name = 'ETHIOPIA'::bpchar) AND (n2.n_name = 'IRAQ'::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=0.023..0.047 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=0.011..0.016 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=45.584..573.060 rows=60264 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58193 read=336 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=36.140..36.140 rows=60264 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=334 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=166.156..166.156 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=0.640..118.922 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 127333.827 ms (53 rows) COMMIT; COMMIT