BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'VIETNAM' 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 = 'ASIA' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'STANDARD POLISHED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1772752.48..1772754.31 rows=729 width=38) (actual time=11029.432..11029.433 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=2020161 read=285761 dirtied=2486 written=420 -> HashAggregate (cost=1772705.06..1772717.82 rows=729 width=38) (actual time=11029.368..11029.369 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=2020158 read=285761 dirtied=2486 written=420 -> Hash Join (cost=39456.09..1772202.90 rows=25108 width=38) (actual time=829.737..10988.970 rows=24811 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=2020158 read=285761 dirtied=2486 written=420 -> Nested Loop (cost=39454.53..1771730.57 rows=25108 width=16) (actual time=829.684..10949.894 rows=24811 loops=1) Buffers: shared hit=2020154 read=285761 dirtied=2486 written=420 -> Hash Join (cost=39454.23..1763629.17 rows=25108 width=16) (actual time=829.669..10758.844 rows=24811 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1945597 read=285761 dirtied=2486 written=420 -> Nested Loop (cost=423.55..1723876.63 rows=125538 width=20) (actual time=7.276..9813.273 rows=122513 loops=1) Buffers: shared hit=1800186 read=284935 dirtied=2486 written=420 -> Nested Loop (cost=423.11..1520769.61 rows=414793 width=16) (actual time=7.149..4033.796 rows=402609 loops=1) Buffers: shared hit=268295 read=204129 dirtied=2155 written=314 -> Bitmap Heap Scan on part (cost=422.55..28555.29 rows=13693 width=4) (actual time=7.082..152.930 rows=13387 loops=1) Recheck Cond: ((p_type)::text = 'STANDARD POLISHED NICKEL'::text) Heap Blocks: exact=11452 Buffers: shared hit=2172 read=9364 written=13 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..419.12 rows=13693 width=0) (actual time=4.820..4.820 rows=13387 loops=1) Index Cond: ((p_type)::text = 'STANDARD POLISHED NICKEL'::text) Buffers: shared read=84 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..108.67 rows=31 width=20) (actual time=0.026..0.280 rows=30 loops=13387) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=266123 read=194765 dirtied=2155 written=301 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.014..0.014 rows=0 loops=402609) Index Cond: (o_orderkey = lineitem.l_orderkey) Filter: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Rows Removed by Filter: 1 Buffers: shared hit=1531891 read=80806 dirtied=331 written=106 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=817.856..817.856 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=145411 read=826 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=20.352..713.485 rows=300270 loops=1) Buffers: shared hit=145411 read=826 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.040..0.068 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=0.007..0.015 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: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.011..0.012 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.11..6455.64 rows=60000 width=8) (actual time=18.477..132.390 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=145409 read=826 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.062..12.062 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=12 read=823 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=24811) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74557 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.020..0.020 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 10kB Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.004..0.009 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.416 ms Execution time: 11030.447 ms (68 rows) COMMIT; COMMIT