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 BURNISHED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2156444.80..2156446.64 rows=733 width=38) (actual time=36600.027..36600.027 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=738118 read=269210 dirtied=2687 written=98 -> HashAggregate (cost=2156397.09..2156409.92 rows=733 width=38) (actual time=36599.926..36599.928 rows=2 loops=1) Buffers: shared hit=738115 read=269210 dirtied=2687 written=98 -> Nested Loop (cost=502090.26..2155913.13 rows=24198 width=38) (actual time=26096.890..36521.970 rows=24141 loops=1) Buffers: shared hit=738115 read=269210 dirtied=2687 written=98 -> Nested Loop (cost=502090.26..2149011.86 rows=24198 width=16) (actual time=26096.814..36238.565 rows=24141 loops=1) Buffers: shared hit=689833 read=269210 dirtied=2687 written=98 -> Hash Join (cost=502090.26..2141965.36 rows=24198 width=16) (actual time=26096.773..35772.974 rows=24141 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=617268 read=269210 dirtied=2687 written=98 -> Nested Loop (cost=0.00..1637644.89 rows=397645 width=16) (actual time=0.418..8543.292 rows=400787 loops=1) Buffers: shared hit=236694 read=234594 dirtied=2687 written=97 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45725.77 rows=13127 width=4) (actual time=0.344..256.066 rows=13361 loops=1) Index Cond: (p_type = 'MEDIUM BURNISHED NICKEL'::text) Heap Fetches: 13361 Buffers: shared hit=4633 read=6881 written=3 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.96 rows=31 width=20) (actual time=0.060..0.604 rows=30 loops=13361) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=232061 read=227713 dirtied=2687 written=94 -> Hash (cost=490566.34..490566.34 rows=921914 width=8) (actual time=26094.691..26094.691 rows=913270 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35675kB Buffers: shared hit=380571 read=34616 written=1 -> Hash Join (cost=139116.72..490566.34 rows=921914 width=8) (actual time=6524.628..25480.042 rows=913270 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=380571 read=34616 written=1 -> Bitmap Heap Scan on orders (cost=100086.10..425030.68 rows=4609572 width=12) (actual time=4013.373..10119.828 rows=4561673 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=254392 read=14557 written=1 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98933.71 rows=4609572 width=0) (actual time=3753.797..3753.797 rows=4602796 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13148 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=2510.963..2510.963 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10557kB Buffers: shared hit=126179 read=20059 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=41.723..2308.109 rows=300270 loops=1) Buffers: shared hit=126179 read=20059 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.042..0.108 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..0.025 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.019..0.019 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=0.016..0.017 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=36.335..440.470 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=126177 read=20059 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=25.350..25.350 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=829 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.017..0.017 rows=1 loops=24141) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72565 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.008..0.009 rows=1 loops=24141) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48282 Total runtime: 36611.181 ms (64 rows) COMMIT; COMMIT