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 = 'SMALL POLISHED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2150393.12..2150394.94 rows=728 width=38) (actual time=35846.074..35846.075 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=787562 read=214633 dirtied=1413 -> HashAggregate (cost=2150345.77..2150358.51 rows=728 width=38) (actual time=35846.002..35846.004 rows=2 loops=1) Buffers: shared hit=787559 read=214633 dirtied=1413 -> Nested Loop (cost=497071.39..2149867.19 rows=23929 width=38) (actual time=25617.301..35773.915 rows=24258 loops=1) Buffers: shared hit=787559 read=214633 dirtied=1413 -> Nested Loop (cost=497071.39..2143042.64 rows=23929 width=16) (actual time=25617.225..35565.220 rows=24258 loops=1) Buffers: shared hit=739043 read=214633 dirtied=1413 -> Hash Join (cost=497071.39..2136072.12 rows=23937 width=16) (actual time=25617.167..35022.045 rows=24258 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=666132 read=214633 dirtied=1413 -> Nested Loop (cost=0.00..1636780.98 rows=396075 width=16) (actual time=0.466..8035.895 rows=398513 loops=1) Buffers: shared hit=293204 read=173981 dirtied=1413 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45725.94 rows=13127 width=4) (actual time=0.367..378.085 rows=13290 loops=1) Index Cond: (p_type = 'SMALL POLISHED TIN'::text) Heap Fetches: 13290 Buffers: shared hit=2 read=11463 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.89 rows=31 width=20) (actual time=0.064..0.561 rows=30 loops=13290) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=293202 read=162518 dirtied=1413 -> Hash (cost=485672.01..485672.01 rows=911951 width=8) (actual time=25615.741..25615.741 rows=911416 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35603kB Buffers: shared hit=372925 read=40652 -> Hash Join (cost=136270.05..485672.01 rows=911951 width=8) (actual time=6214.800..24304.755 rows=911416 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=372925 read=40652 -> Bitmap Heap Scan on orders (cost=97239.43..420422.79 rows=4559757 width=12) (actual time=4254.503..10162.748 rows=4561664 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=227679 read=39742 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..96099.49 rows=4559757 width=0) (actual time=4037.283..4037.283 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=1959.801..1959.801 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=145246 read=910 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=47.767..1745.197 rows=299838 loops=1) Buffers: shared hit=145246 read=910 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.031..0.093 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..0.018 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.016..0.016 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=0.014..0.015 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=41.560..329.459 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145244 read=910 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=30.870..30.870 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=0.020..0.020 rows=1 loops=24258) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72911 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.005..0.006 rows=1 loops=24258) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48516 Total runtime: 35862.032 ms (64 rows) COMMIT; COMMIT