BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'IRAN' 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 ANODIZED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1717471.33..1717473.16 rows=732 width=38) (actual time=11389.069..11389.070 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=1761655 read=245309 dirtied=328 written=20 -> HashAggregate (cost=1717423.69..1717436.50 rows=732 width=38) (actual time=11388.982..11388.983 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1761652 read=245309 dirtied=328 written=20 -> Hash Join (cost=39444.37..1716940.27 rows=24171 width=38) (actual time=1337.981..11347.459 rows=24272 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1761652 read=245309 dirtied=328 written=20 -> Nested Loop (cost=39442.81..1716485.50 rows=24171 width=16) (actual time=1337.896..11308.751 rows=24272 loops=1) Buffers: shared hit=1761648 read=245309 dirtied=328 written=20 -> Hash Join (cost=39442.51..1708686.41 rows=24171 width=16) (actual time=1337.877..11083.617 rows=24272 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1688710 read=245309 dirtied=328 written=20 -> Nested Loop (cost=411.83..1668960.80 rows=120857 width=20) (actual time=11.485..9649.545 rows=121248 loops=1) Buffers: shared hit=1578769 read=209095 dirtied=328 written=20 -> Nested Loop (cost=411.39..1474336.92 rows=397484 width=16) (actual time=11.394..4529.859 rows=399475 loops=1) Buffers: shared hit=280541 read=186317 dirtied=306 written=20 -> Bitmap Heap Scan on part (cost=410.83..27973.17 rows=13213 width=4) (actual time=11.275..178.934 rows=13289 loops=1) Recheck Cond: ((p_type)::text = 'SMALL ANODIZED NICKEL'::text) Heap Blocks: exact=11397 Buffers: shared hit=2909 read=8571 written=3 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..407.52 rows=13213 width=0) (actual time=8.192..8.192 rows=13289 loops=1) Index Cond: ((p_type)::text = 'SMALL ANODIZED NICKEL'::text) Buffers: shared read=83 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.16 rows=31 width=20) (actual time=0.031..0.317 rows=30 loops=13289) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=277632 read=177746 dirtied=306 written=17 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.012..0.012 rows=0 loops=399475) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1298228 read=22778 dirtied=22 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1322.338..1322.338 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=109941 read=36214 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=33.683..1222.795 rows=299838 loops=1) Buffers: shared hit=109941 read=36214 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.082..0.116 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=0.012..0.024 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.031..0.031 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=0.020..0.021 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=905.11..6455.64 rows=60000 width=8) (actual time=23.060..232.215 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=109939 read=36214 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=15.574..15.574 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.008..0.008 rows=1 loops=24272) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72938 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.035..0.035 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..0.011 rows=25 loops=1) Buffers: shared hit=1 Planning time: 12.721 ms Execution time: 11390.314 ms (66 rows) COMMIT; COMMIT