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 = 'LARGE PLATED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1710993.32..1710995.15 rows=732 width=38) (actual time=11441.899..11441.900 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=1778799 read=218810 dirtied=1639 written=686 -> HashAggregate (cost=1710945.68..1710958.49 rows=732 width=38) (actual time=11441.811..11441.813 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1778796 read=218810 dirtied=1639 written=686 -> Hash Join (cost=39439.70..1710462.06 rows=24181 width=38) (actual time=915.183..11396.513 rows=24161 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1778796 read=218810 dirtied=1639 written=686 -> Nested Loop (cost=39438.14..1710007.11 rows=24181 width=16) (actual time=915.120..11352.613 rows=24161 loops=1) Buffers: shared hit=1778792 read=218810 dirtied=1639 written=686 -> Hash Join (cost=39437.85..1702204.81 rows=24181 width=16) (actual time=915.097..11123.240 rows=24161 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1706173 read=218810 dirtied=1639 written=686 -> Nested Loop (cost=407.16..1662478.92 rows=120906 width=20) (actual time=7.175..10081.598 rows=120557 loops=1) Buffers: shared hit=1572754 read=205992 dirtied=1639 written=593 -> Nested Loop (cost=406.73..1467768.52 rows=397645 width=16) (actual time=7.103..5020.034 rows=397044 loops=1) Buffers: shared hit=288302 read=177307 dirtied=1639 written=495 -> Bitmap Heap Scan on part (cost=406.16..27865.33 rows=13127 width=4) (actual time=7.028..221.535 rows=13240 loops=1) Recheck Cond: ((p_type)::text = 'LARGE PLATED TIN'::text) Heap Blocks: exact=11320 Buffers: shared read=11388 written=39 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..402.88 rows=13127 width=0) (actual time=4.697..4.697 rows=13240 loops=1) Index Cond: ((p_type)::text = 'LARGE PLATED TIN'::text) Buffers: shared read=68 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.38 rows=31 width=20) (actual time=0.031..0.351 rows=30 loops=13240) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=288302 read=165919 dirtied=1639 written=456 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.012..0.012 rows=0 loops=397044) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1284452 read=28685 written=98 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=903.235..903.235 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=133419 read=12818 written=93 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=22.493..792.437 rows=300270 loops=1) Buffers: shared hit=133419 read=12818 written=93 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.059..0.086 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=0.009..0.019 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.020..0.020 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=0.014..0.015 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.11..6455.64 rows=60000 width=8) (actual time=20.144..147.305 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=133417 read=12818 written=93 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=13.088..13.088 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=830 written=2 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.008..0.008 rows=1 loops=24161) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72619 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.023..0.023 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..0.005 rows=25 loops=1) Buffers: shared hit=1 Planning time: 8.244 ms Execution time: 11442.992 ms (66 rows) COMMIT; COMMIT