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 = 'MEDIUM PLATED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2178889.92..2178891.75 rows=733 width=38) (actual time=13980.199..13980.199 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=809492 read=191906 -> HashAggregate (cost=2178842.21..2178855.04 rows=733 width=38) (actual time=13980.143..13980.145 rows=2 loops=1) Buffers: shared hit=809489 read=191906 -> Nested Loop (cost=495659.41..2178352.11 rows=24505 width=38) (actual time=10271.406..13950.912 rows=24477 loops=1) Buffers: shared hit=809489 read=191906 -> Nested Loop (cost=495659.41..2171363.29 rows=24505 width=16) (actual time=10271.352..13890.209 rows=24477 loops=1) Buffers: shared hit=760535 read=191906 -> Hash Join (cost=495659.41..2164227.34 rows=24505 width=16) (actual time=10271.299..13688.626 rows=24477 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=689440 read=189457 -> Nested Loop (cost=0.00..1666309.41 rows=402695 width=16) (actual time=0.591..2971.781 rows=400111 loops=1) Buffers: shared hit=311502 read=155258 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46582.76 rows=13413 width=4) (actual time=0.530..127.515 rows=13312 loops=1) Index Cond: (p_type = 'MEDIUM PLATED STEEL'::text) Heap Fetches: 13312 Buffers: shared hit=1 read=11465 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.45 rows=31 width=20) (actual time=0.022..0.206 rows=30 loops=13312) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=311501 read=143793 -> Hash (cost=484238.14..484238.14 rows=913701 width=8) (actual time=10269.778..10269.778 rows=911520 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35607kB Buffers: shared hit=377935 read=34199 -> Hash Join (cost=135919.68..484238.14 rows=913701 width=8) (actual time=1896.324..9979.114 rows=911520 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=377935 read=34199 -> Bitmap Heap Scan on orders (cost=96889.06..418938.62 rows=4568504 width=12) (actual time=1277.603..3581.845 rows=4561961 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=232611 read=33367 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95746.94 rows=4568504 width=0) (actual time=1200.960..1200.960 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=618.410..618.410 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=28.428..550.674 rows=299838 loops=1) Buffers: shared hit=145324 read=832 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.026..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=0.006..0.023 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.010..0.010 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=0.007..0.007 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=18.580..100.095 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=12.996..12.996 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=0.007..0.007 rows=1 loops=24477) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=71095 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=24477) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48954 Total runtime: 13988.845 ms (64 rows) COMMIT; COMMIT