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 = 'PROMO ANODIZED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1727806.34..1727808.16 rows=729 width=38) (actual time=11176.579..11176.579 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=2018756 read=285761 dirtied=1296 written=4416 -> HashAggregate (cost=1727758.92..1727771.68 rows=729 width=38) (actual time=11176.539..11176.541 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=2018753 read=285761 dirtied=1296 written=4416 -> Hash Join (cost=38744.56..1727272.80 rows=24306 width=38) (actual time=2322.744..11135.732 rows=24311 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=2018753 read=285761 dirtied=1296 written=4416 -> Nested Loop (cost=38743.00..1726815.50 rows=24306 width=16) (actual time=2322.699..11097.146 rows=24311 loops=1) Buffers: shared hit=2018749 read=285761 dirtied=1296 written=4416 -> Hash Join (cost=38742.70..1718959.96 rows=24346 width=16) (actual time=2322.685..10953.986 rows=24311 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1945677 read=285761 dirtied=1296 written=4416 -> Nested Loop (cost=412.56..1679929.86 rows=121730 width=20) (actual time=7.338..8565.551 rows=120618 loops=1) Buffers: shared hit=1804557 read=250483 dirtied=1296 written=4416 -> Nested Loop (cost=412.12..1483137.36 rows=401904 width=16) (actual time=7.153..4415.474 rows=397084 loops=1) Buffers: shared hit=263691 read=200803 dirtied=1296 written=3796 -> Bitmap Heap Scan on part (cost=411.56..28088.03 rows=13307 width=4) (actual time=7.092..175.202 rows=13225 loops=1) Recheck Cond: ((p_type)::text = 'PROMO ANODIZED COPPER'::text) Heap Blocks: exact=11248 Buffers: shared hit=468 read=10863 written=228 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..408.23 rows=13307 width=0) (actual time=4.832..4.832 rows=13225 loops=1) Index Cond: ((p_type)::text = 'PROMO ANODIZED COPPER'::text) Buffers: shared read=83 -> Index Scan using lineitem_l_partkey_l_quantity_idx on lineitem (cost=0.56..109.03 rows=31 width=20) (actual time=0.025..0.311 rows=30 loops=13225) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=263223 read=189940 dirtied=1296 written=3568 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.010..0.010 rows=0 loops=397084) 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=1540866 read=49680 written=620 -> Hash (cost=34580.15..34580.15 rows=300000 width=4) (actual time=2312.706..2312.706 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=141120 read=35278 -> Nested Loop (cost=766.08..34580.15 rows=300000 width=4) (actual time=3.761..2210.811 rows=300270 loops=1) Buffers: shared hit=141120 read=35278 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.032..0.054 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=0.004..0.012 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.013..0.013 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=0.008..0.009 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=765.00..6315.54 rows=60000 width=8) (actual time=3.787..431.612 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Rows Removed by Index Recheck: 1439946 Heap Blocks: lossy=176390 Buffers: shared hit=141118 read=35278 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_brin_idx (cost=0.00..750.00 rows=60000 width=0) (actual time=3.751..3.751 rows=353280 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=4 read=2 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=24311) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73072 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.019..0.019 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=0.002..0.005 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.001 ms Execution time: 11177.341 ms (69 rows) COMMIT; COMMIT