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 = 'ECONOMY ANODIZED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1766328.26..1766330.08 rows=729 width=38) (actual time=11921.126..11921.127 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=2094819 read=238781 dirtied=242 written=6256 -> HashAggregate (cost=1766280.84..1766293.60 rows=729 width=38) (actual time=11921.084..11921.086 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=2094816 read=238781 dirtied=242 written=6256 -> Hash Join (cost=38759.28..1765780.18 rows=25033 width=38) (actual time=2027.395..11877.871 rows=24564 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=2094816 read=238781 dirtied=242 written=6256 -> Nested Loop (cost=38757.71..1765309.25 rows=25033 width=16) (actual time=2027.346..11837.569 rows=24564 loops=1) Buffers: shared hit=2094812 read=238781 dirtied=242 written=6256 -> Hash Join (cost=38757.42..1757218.83 rows=25074 width=16) (actual time=2027.326..11688.391 rows=24564 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=2020995 read=238781 dirtied=242 written=6256 -> Nested Loop (cost=427.27..1718167.79 rows=125372 width=20) (actual time=7.366..9588.823 rows=122635 loops=1) Buffers: shared hit=1844598 read=238780 dirtied=242 written=6256 -> Nested Loop (cost=426.84..1515485.10 rows=413929 width=16) (actual time=7.285..5073.494 rows=402152 loops=1) Buffers: shared hit=292390 read=180196 dirtied=242 written=3968 -> Bitmap Heap Scan on part (cost=422.19..28502.14 rows=13647 width=4) (actual time=7.140..168.767 rows=13417 loops=1) Recheck Cond: ((p_type)::text = 'ECONOMY ANODIZED TIN'::text) Heap Blocks: exact=11507 Buffers: shared hit=1440 read=10150 written=247 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..418.78 rows=13647 width=0) (actual time=4.853..4.853 rows=13417 loops=1) Index Cond: ((p_type)::text = 'ECONOMY ANODIZED TIN'::text) Buffers: shared read=83 -> Bitmap Heap Scan on lineitem (cost=4.65..108.65 rows=31 width=20) (actual time=0.044..0.350 rows=30 loops=13417) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=406214 Buffers: shared hit=290950 read=170046 dirtied=242 written=3721 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_idx (cost=0.00..4.64 rows=31 width=0) (actual time=0.023..0.023 rows=30 loops=13417) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=41779 read=13003 written=257 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.011..0.011 rows=0 loops=402152) 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=1552208 read=58584 written=2288 -> Hash (cost=34580.15..34580.15 rows=300000 width=4) (actual time=2017.975..2017.975 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=176397 read=1 -> Nested Loop (cost=766.08..34580.15 rows=300000 width=4) (actual time=3.722..1929.067 rows=299838 loops=1) Buffers: shared hit=176397 read=1 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.034..0.056 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=0.009..0.009 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=765.00..6315.54 rows=60000 width=8) (actual time=3.629..376.670 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Rows Removed by Index Recheck: 1440032 Heap Blocks: lossy=176390 Buffers: shared hit=176395 read=1 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_brin_idx (cost=0.00..750.00 rows=60000 width=0) (actual time=3.598..3.598 rows=353280 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=1 -> 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=24564) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73817 -> 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=0.003..0.006 rows=25 loops=1) Buffers: shared hit=1 Planning time: 6.496 ms Execution time: 11921.756 ms (73 rows) COMMIT; COMMIT