BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'EGYPT' 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 POLISHED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2211039.11..2211040.94 rows=732 width=38) (actual time=63691.619..63691.619 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=774150 read=228303 dirtied=2815 written=4144 -> HashAggregate (cost=2210991.48..2211004.29 rows=732 width=38) (actual time=63691.526..63691.527 rows=2 loops=1) Buffers: shared hit=774147 read=228303 dirtied=2815 written=4144 -> Nested Loop (cost=502295.79..2210489.32 rows=25108 width=38) (actual time=34876.571..63568.195 rows=24293 loops=1) Buffers: shared hit=774147 read=228303 dirtied=2815 written=4144 -> Nested Loop (cost=502295.79..2203328.52 rows=25108 width=16) (actual time=34876.497..61752.671 rows=24293 loops=1) Buffers: shared hit=725561 read=228303 dirtied=2815 written=4144 -> Hash Join (cost=502295.79..2196015.85 rows=25112 width=16) (actual time=34876.448..59863.394 rows=24293 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=652555 read=228303 dirtied=2815 written=4144 -> Nested Loop (cost=0.00..1691402.94 rows=413200 width=16) (actual time=0.712..23730.037 rows=395468 loops=1) Buffers: shared hit=265025 read=200455 dirtied=2815 written=4144 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..47218.28 rows=13627 width=4) (actual time=0.598..941.995 rows=13188 loops=1) Index Cond: (p_type = 'ECONOMY POLISHED BRASS'::text) Heap Fetches: 13188 Buffers: shared hit=1322 read=10113 written=232 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.35 rows=31 width=20) (actual time=0.198..1.708 rows=30 loops=13188) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=263703 read=190342 dirtied=2815 written=3912 -> Hash (cost=490775.11..490775.11 rows=921655 width=8) (actual time=34874.615..34874.615 rows=911403 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35602kB Buffers: shared hit=387527 read=27848 -> Hash Join (cost=139099.42..490775.11 rows=921655 width=8) (actual time=9747.080..34268.967 rows=911403 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=387527 read=27848 -> Bitmap Heap Scan on orders (cost=100068.80..425246.91 rows=4608274 width=12) (actual time=4684.827..15405.472 rows=4561778 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=255581 read=13638 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98916.73 rows=4608274 width=0) (actual time=4544.818..4544.818 rows=4607485 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13165 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=5061.948..5061.948 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=131946 read=14210 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=58.017..4862.484 rows=299838 loops=1) Buffers: shared hit=131946 read=14210 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.474..0.526 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=0.423..0.433 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.026..0.026 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=0.022..0.023 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=905.09..6455.63 rows=60000 width=8) (actual time=49.690..950.838 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=131944 read=14210 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=37.663..37.663 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=832 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.074..0.074 rows=1 loops=24293) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73006 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.069..0.070 rows=1 loops=24293) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48586 Total runtime: 63699.743 ms (64 rows) COMMIT; COMMIT