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 = 'PROMO ANODIZED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1686734.01..1686735.83 rows=729 width=38) (actual time=9817.579..9817.579 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=1736196 read=267524 dirtied=351 written=6711 -> HashAggregate (cost=1686686.59..1686699.35 rows=729 width=38) (actual time=9817.517..9817.518 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1736193 read=267524 dirtied=351 written=6711 -> Hash Join (cost=39434.20..1686215.39 rows=23560 width=38) (actual time=1055.763..9778.495 rows=24208 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1736193 read=267524 dirtied=351 written=6711 -> Nested Loop (cost=39432.64..1685772.08 rows=23560 width=16) (actual time=1055.701..9743.354 rows=24208 loops=1) Buffers: shared hit=1736189 read=267524 dirtied=351 written=6711 -> Hash Join (cost=39432.34..1678170.13 rows=23560 width=16) (actual time=1055.675..9560.159 rows=24208 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1663433 read=267524 dirtied=351 written=6711 -> Nested Loop (cost=401.66..1638462.11 rows=117798 width=20) (actual time=7.373..8430.961 rows=121165 loops=1) Buffers: shared hit=1553382 read=231420 dirtied=351 written=6711 -> Nested Loop (cost=401.22..1447961.99 rows=389062 width=16) (actual time=7.222..4001.807 rows=398566 loops=1) Buffers: shared hit=269113 read=197368 dirtied=351 written=5658 -> Bitmap Heap Scan on part (cost=400.66..27622.47 rows=12933 width=4) (actual time=7.159..177.468 rows=13278 loops=1) Recheck Cond: ((p_type)::text = 'PROMO ANODIZED NICKEL'::text) Heap Blocks: exact=11388 Buffers: shared hit=703 read=10768 written=284 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..397.43 rows=12933 width=0) (actual time=4.834..4.834 rows=13278 loops=1) Index Cond: ((p_type)::text = 'PROMO ANODIZED NICKEL'::text) Buffers: shared read=83 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.51 rows=31 width=20) (actual time=0.026..0.278 rows=30 loops=13278) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=268410 read=186600 dirtied=351 written=5374 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.010..0.010 rows=0 loops=398566) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1284269 read=34052 written=1053 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1045.753..1045.753 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=110051 read=36104 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=22.085..952.052 rows=299838 loops=1) Buffers: shared hit=110051 read=36104 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.054..0.084 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=0.008..0.015 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.022..0.022 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=0.016..0.017 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=18.468..179.381 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=110049 read=36104 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=11.930..11.930 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..0.006 rows=1 loops=24208) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72756 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.022..0.022 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=0.004..0.008 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.556 ms Execution time: 9818.471 ms (66 rows) COMMIT; COMMIT