BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'INDONESIA' 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 = 'MEDIUM POLISHED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2107326.30..2107328.13 rows=732 width=38) (actual time=66688.553..66688.553 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=773321 read=227473 dirtied=377 written=16 -> HashAggregate (cost=2107278.67..2107291.48 rows=732 width=38) (actual time=66688.450..66688.452 rows=2 loops=1) Buffers: shared hit=773318 read=227473 dirtied=377 written=16 -> Nested Loop (cost=496621.74..2106812.45 rows=23311 width=38) (actual time=38189.555..66563.201 rows=24234 loops=1) Buffers: shared hit=773318 read=227473 dirtied=377 written=16 -> Nested Loop (cost=496621.74..2100164.15 rows=23311 width=16) (actual time=38189.476..64565.469 rows=24234 loops=1) Buffers: shared hit=724850 read=227473 dirtied=377 written=16 -> Hash Join (cost=496621.74..2093374.75 rows=23315 width=16) (actual time=38189.423..62578.641 rows=24234 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=652007 read=227473 dirtied=377 written=16 -> Nested Loop (cost=0.00..1594601.70 rows=383631 width=16) (actual time=0.447..22915.304 rows=398624 loops=1) Buffers: shared hit=296390 read=170111 dirtied=377 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..44558.81 rows=12740 width=4) (actual time=0.373..666.528 rows=13296 loops=1) Index Cond: (p_type = 'MEDIUM POLISHED TIN'::text) Heap Fetches: 13296 Buffers: shared hit=6709 read=4758 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..121.36 rows=31 width=20) (actual time=0.198..1.654 rows=30 loops=13296) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=289681 read=165353 dirtied=377 -> Hash (cost=485180.83..485180.83 rows=915273 width=8) (actual time=38187.891..38187.891 rows=913295 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35676kB Buffers: shared hit=355614 read=57362 written=16 -> Hash Join (cost=135940.26..485180.83 rows=915273 width=8) (actual time=8548.594..37381.225 rows=913295 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=355614 read=57362 written=16 -> Bitmap Heap Scan on orders (cost=96909.64..419836.11 rows=4576365 width=12) (actual time=4624.398..19818.861 rows=4561773 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=210207 read=56531 written=16 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95765.55 rows=4576365 width=0) (actual time=4497.081..4497.081 rows=4575464 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=2 read=12455 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=3923.848..3923.848 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10557kB Buffers: shared hit=145407 read=831 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=56.353..3734.721 rows=300270 loops=1) Buffers: shared hit=145407 read=831 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.049..0.110 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..0.024 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: 1kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.017..0.018 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=50.868..727.277 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145405 read=831 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=40.698..40.698 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.078..0.078 rows=1 loops=24234) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72843 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.076..0.077 rows=1 loops=24234) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48468 Total runtime: 66701.279 ms (64 rows) COMMIT; COMMIT