BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'INDONESIA' 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 = 'MEDIUM BURNISHED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1793370.32..1793372.15 rows=732 width=38) (actual time=10367.154..10367.155 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=1769175 read=245164 dirtied=1417 written=401 -> HashAggregate (cost=1793322.69..1793335.50 rows=732 width=38) (actual time=10367.072..10367.072 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1769172 read=245164 dirtied=1417 written=401 -> Hash Join (cost=39461.59..1792811.57 rows=25556 width=38) (actual time=1452.067..10325.179 rows=24143 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1769172 read=245164 dirtied=1417 written=401 -> Nested Loop (cost=39460.03..1792330.83 rows=25556 width=16) (actual time=1451.979..10289.918 rows=24143 loops=1) Buffers: shared hit=1769168 read=245164 dirtied=1417 written=401 -> Hash Join (cost=39459.74..1784084.87 rows=25556 width=16) (actual time=1451.951..10091.668 rows=24143 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1696597 read=245164 dirtied=1417 written=401 -> Nested Loop (cost=429.05..1744319.46 rows=127778 width=20) (actual time=10.704..8562.650 rows=121619 loops=1) Buffers: shared hit=1573970 read=221554 dirtied=1417 written=347 -> Nested Loop (cost=428.62..1538541.92 rows=420249 width=16) (actual time=10.456..4168.335 rows=400798 loops=1) Buffers: shared hit=289797 read=180304 dirtied=1344 written=286 -> Bitmap Heap Scan on part (cost=428.05..28786.61 rows=13887 width=4) (actual time=10.345..192.279 rows=13361 loops=1) Recheck Cond: ((p_type)::text = 'MEDIUM BURNISHED NICKEL'::text) Heap Blocks: exact=11428 Buffers: shared hit=845 read=10667 written=17 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..424.58 rows=13887 width=0) (actual time=7.364..7.364 rows=13361 loops=1) Index Cond: ((p_type)::text = 'MEDIUM BURNISHED NICKEL'::text) Buffers: shared read=84 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..108.41 rows=31 width=20) (actual time=0.028..0.287 rows=30 loops=13361) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=288952 read=169637 dirtied=1344 written=269 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.010..0.010 rows=0 loops=400798) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1284173 read=41250 dirtied=73 written=61 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1436.080..1436.080 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=122627 read=23610 written=54 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=30.982..1289.432 rows=300270 loops=1) Buffers: shared hit=122627 read=23610 written=54 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.066..0.100 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..0.017 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.027..0.027 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=0.019..0.021 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=27.673..238.928 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=122625 read=23610 written=54 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=18.680..18.680 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=830 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=24143) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72571 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.032..0.032 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=0.006..0.010 rows=25 loops=1) Buffers: shared hit=1 Planning time: 11.580 ms Execution time: 10368.507 ms (66 rows) COMMIT; COMMIT