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 = 'STANDARD BURNISHED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2157265.75..2157267.57 rows=728 width=38) (actual time=11131.015..11131.016 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=809510 read=191479 -> HashAggregate (cost=2157218.40..2157231.14 rows=728 width=38) (actual time=11130.958..11130.959 rows=2 loops=1) Buffers: shared hit=809507 read=191479 -> Nested Loop (cost=494263.98..2156738.58 rows=23991 width=38) (actual time=7787.441..11099.787 rows=24342 loops=1) Buffers: shared hit=809507 read=191479 -> Nested Loop (cost=494263.98..2149896.35 rows=23991 width=16) (actual time=7787.391..11040.247 rows=24342 loops=1) Buffers: shared hit=760823 read=191479 -> Hash Join (cost=494263.98..2142907.76 rows=23999 width=16) (actual time=7787.333..10872.326 rows=24342 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=690113 read=189030 -> Nested Loop (cost=0.00..1646418.24 rows=397110 width=16) (actual time=1.438..2699.303 rows=400220 loops=1) Buffers: shared hit=312096 read=154910 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46027.69 rows=13227 width=4) (actual time=1.099..118.106 rows=13330 loops=1) Index Cond: (p_type = 'STANDARD BURNISHED BRASS'::text) Heap Fetches: 13330 Buffers: shared hit=1 read=11382 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.68 rows=31 width=20) (actual time=0.020..0.185 rows=30 loops=13330) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=312095 read=143528 -> Hash (cost=482921.18..482921.18 rows=907424 width=8) (actual time=7784.776..7784.776 rows=911520 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35607kB Buffers: shared hit=378014 read=34120 -> Hash Join (cost=135253.98..482921.18 rows=907424 width=8) (actual time=1616.728..7512.568 rows=911520 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=378014 read=34120 -> Bitmap Heap Scan on orders (cost=96223.35..417802.12 rows=4537118 width=12) (actual time=1023.854..3525.799 rows=4561961 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=232690 read=33288 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95089.08 rows=4537118 width=0) (actual time=954.600..954.600 rows=4561961 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=12456 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=592.631..592.631 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=145324 read=832 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=28.934..525.054 rows=299838 loops=1) Buffers: shared hit=145324 read=832 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.030..0.080 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=0.005..0.020 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.014..0.014 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 = '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=18.731..95.035 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145322 read=832 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=12.925..12.925 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=832 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.006..0.006 rows=1 loops=24342) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=70710 read=2449 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.001..0.001 rows=1 loops=24342) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48684 Total runtime: 11135.353 ms (64 rows) COMMIT; COMMIT