BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'IRAN' 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 = 'MIDDLE EAST' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'SMALL PLATED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2149045.94..2149047.77 rows=732 width=38) (actual time=47125.804..47125.805 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=826660 read=180594 dirtied=588 written=5030 -> HashAggregate (cost=2148998.31..2149011.12 rows=732 width=38) (actual time=47125.740..47125.741 rows=2 loops=1) Buffers: shared hit=826657 read=180594 dirtied=588 written=5030 -> Nested Loop (cost=495401.13..2148518.87 rows=23972 width=38) (actual time=32418.097..47031.720 rows=24683 loops=1) Buffers: shared hit=826657 read=180594 dirtied=588 written=5030 -> Nested Loop (cost=495401.13..2141682.05 rows=23972 width=16) (actual time=32418.007..46119.129 rows=24683 loops=1) Buffers: shared hit=777291 read=180594 dirtied=588 written=5030 -> Hash Join (cost=495401.13..2134700.16 rows=23976 width=16) (actual time=32417.951..45072.114 rows=24683 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=703136 read=180589 dirtied=588 written=5030 -> Nested Loop (cost=0.00..1637086.79 rows=394495 width=16) (actual time=3.553..11492.831 rows=403394 loops=1) Buffers: shared hit=357822 read=113766 dirtied=588 written=2979 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45761.79 rows=13140 width=4) (actual time=0.182..228.809 rows=13442 loops=1) Index Cond: (p_type = 'SMALL PLATED NICKEL'::text) Heap Fetches: 13442 Buffers: shared hit=9819 read=1686 written=58 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.80 rows=31 width=20) (actual time=0.109..0.821 rows=30 loops=13442) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=348003 read=112080 dirtied=588 written=2921 -> Hash (cost=483994.37..483994.37 rows=912541 width=8) (actual time=32413.649..32413.649 rows=910630 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35572kB Buffers: shared hit=345311 read=66823 written=2051 -> Hash Join (cost=135796.24..483994.37 rows=912541 width=8) (actual time=7726.093..31797.820 rows=910630 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=345311 read=66823 written=2051 -> Bitmap Heap Scan on orders (cost=96765.62..418728.20 rows=4562705 width=12) (actual time=3893.452..15947.378 rows=4557440 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=209323 read=56655 written=2051 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95624.95 rows=4562705 width=0) (actual time=3765.162..3765.162 rows=4561961 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=4576 read=7880 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=3832.300..3832.300 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=135988 read=10168 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=78.475..3649.714 rows=299838 loops=1) Buffers: shared hit=135988 read=10168 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.038..0.104 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..0.019 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: 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 = 'MIDDLE EAST'::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=53.481..711.033 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=135986 read=10168 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=43.516..43.516 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=9 read=828 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.039..0.040 rows=1 loops=24683) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74155 read=5 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.032..0.033 rows=1 loops=24683) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=49366 Total runtime: 47134.064 ms (64 rows) COMMIT; COMMIT