BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'JORDAN' then volume else 0 end) / sum(volume) as mkt_share from ( select extract(year from o_orderdate) as o_year, l_extendedprice * (1 - l_discount) as volume, n2.n_name as nation from part, supplier, lineitem, orders, customer, nation n1, nation n2, region where p_partkey = l_partkey and s_suppkey = l_suppkey and l_orderkey = o_orderkey and o_custkey = c_custkey and c_nationkey = n1.n_nationkey and n1.n_regionkey = r_regionkey and r_name = 'MIDDLE EAST' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'ECONOMY PLATED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1780323.64..1780325.46 rows=729 width=38) (actual time=12049.170..12049.171 rows=2 loops=1) Sort Key: (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone)) Sort Method: quicksort Memory: 25kB Buffers: shared hit=1625841 read=430668 dirtied=382 written=4219 -> HashAggregate (cost=1780276.22..1780288.98 rows=729 width=38) (actual time=12049.101..12049.102 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1625838 read=430668 dirtied=382 written=4219 -> Hash Join (cost=39460.92..1779774.96 rows=25063 width=38) (actual time=1072.432..12002.901 rows=24838 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1625838 read=430668 dirtied=382 written=4219 -> Nested Loop (cost=39459.36..1779303.46 rows=25063 width=16) (actual time=1072.345..11958.897 rows=24838 loops=1) Buffers: shared hit=1625834 read=430668 dirtied=382 written=4219 -> Hash Join (cost=39459.06..1771210.09 rows=25083 width=16) (actual time=1072.323..11768.472 rows=24838 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1551475 read=430395 dirtied=382 written=4219 -> Nested Loop (cost=428.38..1731458.27 rows=125416 width=20) (actual time=7.177..10565.249 rows=124605 loops=1) Buffers: shared hit=1426636 read=409079 dirtied=382 written=4219 -> Nested Loop (cost=427.94..1528596.95 rows=414312 width=16) (actual time=6.955..5607.008 rows=410120 loops=1) Buffers: shared hit=182137 read=297144 dirtied=382 written=3446 -> Bitmap Heap Scan on part (cost=427.38..28685.99 rows=13800 width=4) (actual time=6.899..201.279 rows=13689 loops=1) Recheck Cond: ((p_type)::text = 'ECONOMY PLATED STEEL'::text) Heap Blocks: exact=11676 Buffers: shared read=11761 written=207 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..423.93 rows=13800 width=0) (actual time=4.448..4.448 rows=13689 loops=1) Index Cond: ((p_type)::text = 'ECONOMY PLATED STEEL'::text) Buffers: shared read=85 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..108.38 rows=31 width=20) (actual time=0.032..0.383 rows=30 loops=13689) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=182137 read=285383 dirtied=382 written=3239 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.011..0.011 rows=0 loops=410120) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1244499 read=111935 written=773 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1062.758..1062.758 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=124839 read=21316 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=20.127..924.927 rows=299838 loops=1) Buffers: shared hit=124839 read=21316 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.033..0.091 rows=5 loops=1) Hash Cond: (n1.n_regionkey = region.r_regionkey) Buffers: shared hit=2 -> Seq Scan on nation n1 (cost=0.00..1.25 rows=25 width=8) (actual time=0.004..0.023 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.013..0.013 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.009..0.010 rows=1 loops=1) Filter: (r_name = 'MIDDLE EAST'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.11..6455.64 rows=60000 width=8) (actual time=19.911..172.858 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=124837 read=21316 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=13.051..13.051 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=24838) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74359 read=273 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.032..0.032 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 10kB Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.006..0.009 rows=25 loops=1) Buffers: shared hit=1 Planning time: 6.384 ms Execution time: 12050.239 ms (66 rows) COMMIT; COMMIT