BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'INDIA' 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 = 'ASIA' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'STANDARD ANODIZED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2156848.38..2156850.20 rows=731 width=38) (actual time=29378.708..29378.708 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=841348 read=152402 dirtied=653 written=6246 -> HashAggregate (cost=2156800.81..2156813.60 rows=731 width=38) (actual time=29378.656..29378.657 rows=2 loops=1) Buffers: shared hit=841345 read=152402 dirtied=653 written=6246 -> Nested Loop (cost=495286.65..2156318.91 rows=24095 width=38) (actual time=22779.974..29303.955 rows=23854 loops=1) Buffers: shared hit=841345 read=152402 dirtied=653 written=6246 -> Nested Loop (cost=495286.65..2149447.02 rows=24095 width=16) (actual time=22779.888..29129.822 rows=23854 loops=1) Buffers: shared hit=793637 read=152402 dirtied=653 written=6246 -> Hash Join (cost=495286.65..2142430.47 rows=24095 width=16) (actual time=22779.840..28790.734 rows=23854 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=721942 read=152397 dirtied=653 written=6246 -> Nested Loop (cost=0.00..1644919.42 rows=396690 width=16) (actual time=0.344..4684.632 rows=395111 loops=1) Buffers: shared hit=368621 read=93499 dirtied=653 written=4579 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45983.23 rows=13213 width=4) (actual time=0.288..220.671 rows=13198 loops=1) Index Cond: (p_type = 'STANDARD ANODIZED BRASS'::text) Heap Fetches: 13198 Buffers: shared hit=3116 read=8288 written=382 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.70 rows=31 width=20) (actual time=0.045..0.323 rows=30 loops=13198) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=365505 read=85211 dirtied=653 written=4197 -> Hash (cost=483886.33..483886.33 rows=912025 width=8) (actual time=22778.669..22778.669 rows=912402 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35641kB Buffers: shared hit=353318 read=58898 written=1667 -> Hash Join (cost=135741.78..483886.33 rows=912025 width=8) (actual time=5103.477..22211.743 rows=912402 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=353318 read=58898 written=1667 -> Bitmap Heap Scan on orders (cost=96711.16..418635.00 rows=4560123 width=12) (actual time=3242.520..7714.085 rows=4557440 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=221023 read=44955 written=1667 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95571.13 rows=4560123 width=0) (actual time=3130.114..3130.114 rows=4561961 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=4335 read=8121 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1860.752..1860.752 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10557kB Buffers: shared hit=132295 read=13943 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=38.984..1695.579 rows=300270 loops=1) Buffers: shared hit=132295 read=13943 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.030..0.100 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=0.003..0.016 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.008..0.008 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=0.006..0.007 rows=1 loops=1) Filter: (r_name = 'ASIA'::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=31.012..321.555 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=132293 read=13943 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=22.207..22.207 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=8 read=828 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.012..0.012 rows=1 loops=23854) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=71695 read=5 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.004..0.004 rows=1 loops=23854) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=47708 Total runtime: 29400.733 ms (64 rows) COMMIT; COMMIT