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 = 'ECONOMY BRUSHED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1751934.39..1751936.21 rows=729 width=38) (actual time=10709.363..10709.363 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=1771357 read=247593 dirtied=476 written=2500 -> HashAggregate (cost=1751886.97..1751899.73 rows=729 width=38) (actual time=10709.300..10709.301 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1771354 read=247593 dirtied=476 written=2500 -> Hash Join (cost=39454.95..1751392.27 rows=24735 width=38) (actual time=836.442..10666.019 rows=24439 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1771354 read=247593 dirtied=476 written=2500 -> Nested Loop (cost=39453.39..1750926.93 rows=24735 width=16) (actual time=836.376..10628.180 rows=24439 loops=1) Buffers: shared hit=1771350 read=247593 dirtied=476 written=2500 -> Hash Join (cost=39453.10..1742945.87 rows=24735 width=16) (actual time=836.352..10421.501 rows=24439 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1697912 read=247593 dirtied=476 written=2500 -> Nested Loop (cost=422.41..1703204.05 rows=123674 width=20) (actual time=8.152..9509.729 rows=122105 loops=1) Buffers: shared hit=1552504 read=246764 dirtied=476 written=2440 -> Nested Loop (cost=421.98..1503204.99 rows=408468 width=16) (actual time=8.000..4835.537 rows=401542 loops=1) Buffers: shared hit=260940 read=210196 dirtied=476 written=2158 -> Bitmap Heap Scan on part (cost=417.26..28355.92 rows=13527 width=4) (actual time=7.885..139.486 rows=13411 loops=1) Recheck Cond: ((p_type)::text = 'ECONOMY BRUSHED STEEL'::text) Heap Blocks: exact=11429 Buffers: shared hit=5043 read=6470 written=112 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..413.88 rows=13527 width=0) (actual time=5.514..5.514 rows=13411 loops=1) Index Cond: ((p_type)::text = 'ECONOMY BRUSHED STEEL'::text) Buffers: shared read=84 written=5 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.042..0.338 rows=30 loops=13411) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=403993 Buffers: shared hit=255897 read=203726 dirtied=476 written=2046 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.026..0.026 rows=30 loops=13411) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=40401 read=15229 written=134 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.011..0.011 rows=0 loops=401542) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1291564 read=36568 written=282 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=824.195..824.195 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=145408 read=829 written=60 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=22.950..734.679 rows=300270 loops=1) Buffers: shared hit=145408 read=829 written=60 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.059..0.088 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=0.007..0.015 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.022..0.022 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=0.016..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=905.11..6455.64 rows=60000 width=8) (actual time=19.616..135.968 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=145406 read=829 written=60 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.945..12.945 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=829 written=60 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=24439) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73438 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.026..0.026 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=0.005..0.009 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.824 ms Execution time: 10710.278 ms (70 rows) COMMIT; COMMIT