BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'JORDAN' 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 = 'PROMO POLISHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2194663.37..2194665.20 rows=729 width=38) (actual time=30639.915..30639.915 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=718125 read=284979 dirtied=1105 written=24 -> HashAggregate (cost=2194615.95..2194628.71 rows=729 width=38) (actual time=30639.830..30639.832 rows=2 loops=1) Buffers: shared hit=718122 read=284979 dirtied=1105 written=24 -> Nested Loop (cost=497357.84..2194122.37 rows=24679 width=38) (actual time=22447.747..30569.001 rows=24267 loops=1) Buffers: shared hit=718122 read=284979 dirtied=1105 written=24 -> Nested Loop (cost=497357.84..2187083.92 rows=24679 width=16) (actual time=22447.679..30401.025 rows=24267 loops=1) Buffers: shared hit=669588 read=284979 dirtied=1105 written=24 -> Hash Join (cost=497357.84..2179888.01 rows=24711 width=16) (actual time=22447.642..30050.909 rows=24267 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=596625 read=284979 dirtied=1105 written=24 -> Nested Loop (cost=0.00..1680241.44 rows=408323 width=16) (actual time=0.568..6438.802 rows=399281 loops=1) Buffers: shared hit=234291 read=233733 dirtied=1105 written=22 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46937.14 rows=13533 width=4) (actual time=0.466..246.771 rows=13296 loops=1) Index Cond: (p_type = 'PROMO POLISHED COPPER'::text) Heap Fetches: 13296 Buffers: shared hit=827 read=10653 written=1 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.38 rows=31 width=20) (actual time=0.043..0.450 rows=30 loops=13296) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=233464 read=223080 dirtied=1105 written=21 -> Hash (cost=485942.44..485942.44 rows=913232 width=8) (actual time=22445.596..22445.596 rows=911416 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35603kB Buffers: shared hit=362331 read=51246 written=2 -> Hash Join (cost=136407.66..485942.44 rows=913232 width=8) (actual time=5086.727..21909.512 rows=911416 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=362331 read=51246 written=2 -> Bitmap Heap Scan on orders (cost=97377.04..420656.41 rows=4566158 width=12) (actual time=3186.667..7439.107 rows=4561664 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=252280 read=15141 written=2 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..96235.50 rows=4566158 width=0) (actual time=3038.551..3038.551 rows=4584480 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=12634 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1899.574..1899.574 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=110051 read=36105 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=33.462..1717.029 rows=299838 loops=1) Buffers: shared hit=110051 read=36105 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.031..0.114 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=0.006..0.030 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.015..0.015 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=0.013..0.014 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=31.528..324.465 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=110049 read=36105 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=22.172..22.172 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=24267) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72963 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.003..0.004 rows=1 loops=24267) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48534 Total runtime: 30656.774 ms (64 rows) COMMIT; COMMIT