BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'MOZAMBIQUE' 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 = 'AFRICA' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'PROMO ANODIZED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2155076.72..2155078.55 rows=733 width=38) (actual time=31683.380..31683.380 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=851118 read=154306 dirtied=562 written=7079 -> HashAggregate (cost=2155029.01..2155041.84 rows=733 width=38) (actual time=31683.306..31683.308 rows=2 loops=1) Buffers: shared hit=851115 read=154306 dirtied=562 written=7079 -> Nested Loop (cost=495659.41..2154546.95 rows=24103 width=38) (actual time=25289.633..31625.916 rows=24262 loops=1) Buffers: shared hit=851115 read=154306 dirtied=562 written=7079 -> Nested Loop (cost=495659.41..2147672.78 rows=24103 width=16) (actual time=25289.559..31473.013 rows=24262 loops=1) Buffers: shared hit=802591 read=154306 dirtied=562 written=7079 -> Hash Join (cost=495659.41..2140653.90 rows=24103 width=16) (actual time=25289.505..31158.180 rows=24262 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=729690 read=154302 dirtied=562 written=7079 -> Nested Loop (cost=0.00..1642773.01 rows=396090 width=16) (actual time=0.339..4614.212 rows=403626 loops=1) Buffers: shared hit=372170 read=99692 dirtied=562 written=5263 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45922.92 rows=13193 width=4) (actual time=0.287..229.320 rows=13430 loops=1) Index Cond: (p_type = 'PROMO ANODIZED TIN'::text) Heap Fetches: 13430 Buffers: shared hit=2106 read=9456 written=499 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.73 rows=31 width=20) (actual time=0.040..0.314 rows=30 loops=13430) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=370064 read=90236 dirtied=562 written=4764 -> Hash (cost=484238.14..484238.14 rows=913701 width=8) (actual time=25288.241..25288.241 rows=911011 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35587kB Buffers: shared hit=357517 read=54610 written=1816 -> Hash Join (cost=135919.68..484238.14 rows=913701 width=8) (actual time=5446.759..24165.960 rows=911011 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=357517 read=54610 written=1816 -> Bitmap Heap Scan on orders (cost=96889.06..418938.62 rows=4568504 width=12) (actual time=3617.004..9217.473 rows=4557440 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=214779 read=51199 written=1816 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95746.94 rows=4568504 width=0) (actual time=3453.121..3453.121 rows=4561961 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=8449 read=4007 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1829.303..1829.303 rows=299493 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10530kB Buffers: shared hit=142738 read=3411 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=23.190..1651.886 rows=299493 loops=1) Buffers: shared hit=142738 read=3411 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.029..0.105 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=0.005..0.021 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.015..0.015 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 1kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.012..0.013 rows=1 loops=1) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=27.689..311.624 rows=59899 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=142736 read=3411 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=18.322..18.322 rows=59899 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=833 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.011..0.011 rows=1 loops=24262) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72901 read=4 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.003..0.004 rows=1 loops=24262) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48524 Total runtime: 31702.199 ms (64 rows) COMMIT; COMMIT