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 BRUSHED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2136000.01..2136001.84 rows=732 width=38) (actual time=46660.303..46660.303 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=799139 read=197531 dirtied=534 written=6446 -> HashAggregate (cost=2135952.37..2135965.18 rows=732 width=38) (actual time=46660.237..46660.239 rows=2 loops=1) Buffers: shared hit=799136 read=197531 dirtied=534 written=6446 -> Nested Loop (cost=495401.13..2135477.31 rows=23753 width=38) (actual time=32416.563..46568.533 rows=24306 loops=1) Buffers: shared hit=799136 read=197531 dirtied=534 written=6446 -> Nested Loop (cost=495401.13..2128702.95 rows=23753 width=16) (actual time=32416.484..45723.139 rows=24306 loops=1) Buffers: shared hit=750524 read=197531 dirtied=534 written=6446 -> Hash Join (cost=495401.13..2121784.83 rows=23757 width=16) (actual time=32415.932..44709.253 rows=24306 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=677477 read=197530 dirtied=534 written=6446 -> Nested Loop (cost=0.00..1624191.66 rows=390893 width=16) (actual time=0.259..11141.613 rows=395891 loops=1) Buffers: shared hit=348644 read=114144 dirtied=534 written=3083 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45399.70 rows=13020 width=4) (actual time=0.205..259.844 rows=13197 loops=1) Index Cond: (p_type = 'LARGE BRUSHED TIN'::text) Heap Fetches: 13197 Buffers: shared hit=8946 read=2394 written=99 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.95 rows=31 width=20) (actual time=0.102..0.808 rows=30 loops=13197) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=339698 read=111750 dirtied=534 written=2984 -> Hash (cost=483994.37..483994.37 rows=912541 width=8) (actual time=32411.526..32411.526 rows=912402 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35641kB Buffers: shared hit=328830 read=83386 written=3363 -> Hash Join (cost=135796.24..483994.37 rows=912541 width=8) (actual time=7748.585..31765.813 rows=912402 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=328830 read=83386 written=3363 -> Bitmap Heap Scan on orders (cost=96765.62..418728.20 rows=4562705 width=12) (actual time=3698.147..16204.427 rows=4557440 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=193034 read=72944 written=3363 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95624.95 rows=4562705 width=0) (actual time=3563.543..3563.543 rows=4561961 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=7883 read=4573 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=4050.215..4050.215 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10557kB Buffers: shared hit=135796 read=10442 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=47.650..3860.913 rows=300270 loops=1) Buffers: shared hit=135796 read=10442 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.024..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=0.004..0.018 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.011..0.011 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=0.009..0.010 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=49.709..751.578 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=135794 read=10442 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=38.852..38.852 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=9 read=827 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.039..0.039 rows=1 loops=24306) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73047 read=1 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.030..0.031 rows=1 loops=24306) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48612 Total runtime: 46668.306 ms (64 rows) COMMIT; COMMIT