BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'IRAQ' 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 = 'LARGE POLISHED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2229445.40..2229447.23 rows=731 width=38) (actual time=28193.522..28193.523 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=808578 read=195156 dirtied=2643 written=88 -> HashAggregate (cost=2229397.84..2229410.63 rows=731 width=38) (actual time=28193.415..28193.416 rows=2 loops=1) Buffers: shared hit=808575 read=195156 dirtied=2643 written=88 -> Nested Loop (cost=501602.03..2228890.02 rows=25391 width=38) (actual time=21421.198..28116.975 rows=24094 loops=1) Buffers: shared hit=808575 read=195156 dirtied=2643 written=88 -> Nested Loop (cost=501602.03..2221648.51 rows=25391 width=16) (actual time=21421.104..27946.255 rows=24094 loops=1) Buffers: shared hit=760387 read=195156 dirtied=2643 written=88 -> Hash Join (cost=501602.03..2214254.59 rows=25391 width=16) (actual time=21421.058..27598.780 rows=24094 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=687985 read=195156 dirtied=2643 written=88 -> Nested Loop (cost=0.00..1710307.42 rows=418248 width=16) (actual time=0.536..4959.915 rows=398048 loops=1) Buffers: shared hit=336111 read=131922 dirtied=2391 written=6 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..47753.96 rows=13807 width=4) (actual time=0.412..155.974 rows=13252 loops=1) Index Cond: (p_type = 'LARGE POLISHED TIN'::text) Heap Fetches: 13252 Buffers: shared hit=5854 read=5530 written=2 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.10 rows=31 width=20) (actual time=0.040..0.348 rows=30 loops=13252) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=330257 read=126392 dirtied=2391 written=4 -> Hash (cost=490105.28..490105.28 rows=919740 width=8) (actual time=21419.148..21419.148 rows=911405 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35602kB Buffers: shared hit=351871 read=63234 dirtied=252 written=82 -> Hash Join (cost=138881.27..490105.28 rows=919740 width=8) (actual time=5493.099..20875.985 rows=911405 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=351871 read=63234 dirtied=252 written=82 -> Bitmap Heap Scan on orders (cost=99850.65..424632.14 rows=4598699 width=12) (actual time=3723.753..8487.623 rows=4561673 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=227045 read=41904 dirtied=252 written=82 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98700.98 rows=4598699 width=0) (actual time=3508.053..3508.053 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=1768.268..1768.268 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=124826 read=21330 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=36.125..1598.965 rows=299838 loops=1) Buffers: shared hit=124826 read=21330 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.053..0.097 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=0.009..0.022 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.023..0.023 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=0.020..0.021 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=32.036..298.245 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=124824 read=21330 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=21.961..21.961 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=0.012..0.012 rows=1 loops=24094) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72402 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.004..0.004 rows=1 loops=24094) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48188 Total runtime: 28204.073 ms (64 rows) COMMIT; COMMIT