BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'FRANCE' 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 = 'EUROPE' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'SMALL BRUSHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1761347.64..1761349.47 rows=732 width=38) (actual time=10457.816..10457.816 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=1783466 read=219503 dirtied=361 written=10 -> HashAggregate (cost=1761300.00..1761312.81 rows=732 width=38) (actual time=10457.741..10457.741 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1783463 read=219503 dirtied=361 written=10 -> Hash Join (cost=39455.52..1760802.18 rows=24891 width=38) (actual time=1147.971..10414.879 rows=24422 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1783463 read=219503 dirtied=361 written=10 -> Nested Loop (cost=39453.96..1760333.91 rows=24891 width=16) (actual time=1147.882..10376.992 rows=24422 loops=1) Buffers: shared hit=1783459 read=219503 dirtied=361 written=10 -> Hash Join (cost=39453.67..1752302.49 rows=24891 width=16) (actual time=1147.846..10168.906 rows=24422 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1710065 read=219503 dirtied=361 written=10 -> Nested Loop (cost=422.98..1712556.19 rows=124455 width=20) (actual time=10.375..8938.886 rows=121316 loops=1) Buffers: shared hit=1564721 read=218671 dirtied=361 written=10 -> Nested Loop (cost=422.55..1512138.07 rows=409320 width=16) (actual time=10.287..4206.406 rows=398490 loops=1) Buffers: shared hit=271709 read=193507 dirtied=361 written=10 -> Bitmap Heap Scan on part (cost=421.98..28469.90 rows=13620 width=4) (actual time=10.190..165.443 rows=13250 loops=1) Recheck Cond: ((p_type)::text = 'SMALL BRUSHED COPPER'::text) Heap Blocks: exact=11307 Buffers: shared hit=2349 read=9040 written=2 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..418.58 rows=13620 width=0) (actual time=7.154..7.154 rows=13250 loops=1) Index Cond: ((p_type)::text = 'SMALL BRUSHED COPPER'::text) Buffers: shared read=82 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..108.62 rows=31 width=20) (actual time=0.029..0.293 rows=30 loops=13250) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=269360 read=184467 dirtied=361 written=8 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.011..0.011 rows=0 loops=398490) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1293012 read=25164 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1132.997..1132.997 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14677kB Buffers: shared hit=145344 read=832 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=31.788..972.382 rows=300963 loops=1) Buffers: shared hit=145344 read=832 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.086..0.121 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=0.010..0.018 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.042..0.042 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=0.032..0.033 rows=1 loops=1) Filter: (r_name = 'EUROPE'::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=28.712..174.453 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145336 Buffers: shared hit=145342 read=832 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=19.226..19.226 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=831 -> 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=24422) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73394 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.031..0.031 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..0.014 rows=25 loops=1) Buffers: shared hit=1 Planning time: 11.399 ms Execution time: 10458.687 ms (66 rows) COMMIT; COMMIT