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 = 'UNITED STATES') or (n1.n_name = 'UNITED STATES' 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=2359714.32..2361615.15 rows=58487 width=64) (actual time=128228.399..128255.649 rows=4 loops=1) Buffers: shared hit=974854 read=457525 dirtied=39 written=2363 -> Sort (cost=2359714.32..2359860.54 rows=58487 width=64) (actual time=128218.453..128224.161 rows=58408 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: 9750kB Buffers: shared hit=974854 read=457525 dirtied=39 written=2363 -> Hash Join (cost=896500.65..2355083.37 rows=58487 width=64) (actual time=66661.138..127744.651 rows=58408 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=974846 read=457525 dirtied=39 written=2363 -> Hash Join (cost=891821.65..2320273.84 rows=1462661 width=72) (actual time=66472.350..123624.393 rows=1469315 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=972664 read=457525 dirtied=39 written=2363 -> Bitmap Heap Scan on lineitem (cost=387256.28..1732464.75 rows=18297898 width=20) (actual time=18282.922..53828.311 rows=18247443 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=736037 read=380923 written=125 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382681.81 rows=18297898 width=0) (actual time=17589.937..17589.937 rows=18320255 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=2047 read=47768 -> Hash (cost=489502.50..489502.50 rows=1205029 width=60) (actual time=48187.631..48187.631 rows=1208510 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108578kB Buffers: shared hit=236627 read=76602 dirtied=39 written=2238 -> Hash Join (cost=15638.06..489502.50 rows=1205029 width=60) (actual time=2116.688..47069.271 rows=1208510 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=236627 read=76602 dirtied=39 written=2238 -> Seq Scan on orders (cost=0.00..405283.20 rows=15074920 width=8) (actual time=0.016..11910.050 rows=15015000 loops=1) Buffers: shared hit=198010 read=56524 dirtied=39 written=2238 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=2116.373..2116.373 rows=120477 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10825kB Buffers: shared hit=38617 read=20078 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=22.491..1996.439 rows=120477 loops=1) Buffers: shared hit=38617 read=20078 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.132..0.442 rows=2 loops=1) Join Filter: (((n1.n_name = 'ETHIOPIA'::bpchar) AND (n2.n_name = 'UNITED STATES'::bpchar)) OR ((n1.n_name = 'UNITED STATES'::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=0.020..0.049 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=29.372..974.038 rows=60238 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=38614 read=20078 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=20.676..20.676 rows=60238 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=335 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=182.829..182.829 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=0.014..134.573 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 128280.379 ms (53 rows) COMMIT; COMMIT